diff --git a/package-lock.json b/package-lock.json
index 8f9bbb1..f498522 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -20,6 +20,8 @@
         "@types/lodash": "^4.14.195",
         "emoji-mart": "^5.5.2",
         "heroicons": "^2.0.18",
+        "i18next": "^23.1.0",
+        "i18next-browser-languagedetector": "^7.0.2",
         "lodash": "^4.17.21",
         "nostr-tools": "^1.11.2",
         "solid-js": "^1.7.5",
@@ -507,10 +509,9 @@
       }
     },
     "node_modules/@babel/runtime": {
-      "version": "7.20.7",
-      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.20.7.tgz",
-      "integrity": "sha512-UF0tvkUtxwAgZ5W/KrkHf0Rn0fdnLDU9ScxBrEVNUprE/MzirjK4MJUX1/BVDv00Sv8cljtukVK1aky++X1SjQ==",
-      "dev": true,
+      "version": "7.22.5",
+      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.22.5.tgz",
+      "integrity": "sha512-ecjvYlnAaZ/KVneE/OdKYBYfgXV3Ptu6zQWmgEF7vwKhQnvVS6bjMD2XYgj+SNvQ1GfK/pjgokfPkC/2CO8CuA==",
       "dependencies": {
         "regenerator-runtime": "^0.13.11"
       },
@@ -3999,6 +4000,36 @@
         "url": "https://github.com/sponsors/typicode"
       }
     },
+    "node_modules/i18next": {
+      "version": "23.1.0",
+      "resolved": "https://registry.npmjs.org/i18next/-/i18next-23.1.0.tgz",
+      "integrity": "sha512-CObNPofJpw7zGVGYLd58mtMZUF+NZQl9czYMihbJkStjX+Nlu9kC3PHiC6uE1niP3qxP/3ocLXIBc2zqbAb1dg==",
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://locize.com"
+        },
+        {
+          "type": "individual",
+          "url": "https://locize.com/i18next.html"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.i18next.com/how-to/faq#i18next-is-awesome.-how-can-i-support-the-project"
+        }
+      ],
+      "dependencies": {
+        "@babel/runtime": "^7.22.5"
+      }
+    },
+    "node_modules/i18next-browser-languagedetector": {
+      "version": "7.0.2",
+      "resolved": "https://registry.npmjs.org/i18next-browser-languagedetector/-/i18next-browser-languagedetector-7.0.2.tgz",
+      "integrity": "sha512-5ViaK+gikxfqZ9M3jJ7gJkUzzu/p3HwiqfLoL1bdiL7CUb0IylcTyVLdPaTU3pH5VFWFCiGFuJDg3VkLUikWgg==",
+      "dependencies": {
+        "@babel/runtime": "^7.19.4"
+      }
+    },
     "node_modules/ignore": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.2.0.tgz",
@@ -5920,8 +5951,7 @@
     "node_modules/regenerator-runtime": {
       "version": "0.13.11",
       "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.13.11.tgz",
-      "integrity": "sha512-kY1AZVr2Ra+t+piVaJ4gxaFaReZVH40AKNo7UCX6W+dEwBo/2oZJzqfuN1qLq1oL45o56cPaTXELwrTh8Fpggg==",
-      "dev": true
+      "integrity": "sha512-kY1AZVr2Ra+t+piVaJ4gxaFaReZVH40AKNo7UCX6W+dEwBo/2oZJzqfuN1qLq1oL45o56cPaTXELwrTh8Fpggg=="
     },
     "node_modules/regexp.prototype.flags": {
       "version": "1.4.3",
@@ -7726,10 +7756,9 @@
       }
     },
     "@babel/runtime": {
-      "version": "7.20.7",
-      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.20.7.tgz",
-      "integrity": "sha512-UF0tvkUtxwAgZ5W/KrkHf0Rn0fdnLDU9ScxBrEVNUprE/MzirjK4MJUX1/BVDv00Sv8cljtukVK1aky++X1SjQ==",
-      "dev": true,
+      "version": "7.22.5",
+      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.22.5.tgz",
+      "integrity": "sha512-ecjvYlnAaZ/KVneE/OdKYBYfgXV3Ptu6zQWmgEF7vwKhQnvVS6bjMD2XYgj+SNvQ1GfK/pjgokfPkC/2CO8CuA==",
       "requires": {
         "regenerator-runtime": "^0.13.11"
       }
@@ -10140,6 +10169,22 @@
       "integrity": "sha512-+dQSyqPh4x1hlO1swXBiNb2HzTDN1I2IGLQx1GrBuiqFJfoMrnZWwVmatvSiO+Iz8fBUnf+lekwNo4c2LlXItg==",
       "dev": true
     },
+    "i18next": {
+      "version": "23.1.0",
+      "resolved": "https://registry.npmjs.org/i18next/-/i18next-23.1.0.tgz",
+      "integrity": "sha512-CObNPofJpw7zGVGYLd58mtMZUF+NZQl9czYMihbJkStjX+Nlu9kC3PHiC6uE1niP3qxP/3ocLXIBc2zqbAb1dg==",
+      "requires": {
+        "@babel/runtime": "^7.22.5"
+      }
+    },
+    "i18next-browser-languagedetector": {
+      "version": "7.0.2",
+      "resolved": "https://registry.npmjs.org/i18next-browser-languagedetector/-/i18next-browser-languagedetector-7.0.2.tgz",
+      "integrity": "sha512-5ViaK+gikxfqZ9M3jJ7gJkUzzu/p3HwiqfLoL1bdiL7CUb0IylcTyVLdPaTU3pH5VFWFCiGFuJDg3VkLUikWgg==",
+      "requires": {
+        "@babel/runtime": "^7.19.4"
+      }
+    },
     "ignore": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.2.0.tgz",
@@ -11499,8 +11544,7 @@
     "regenerator-runtime": {
       "version": "0.13.11",
       "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.13.11.tgz",
-      "integrity": "sha512-kY1AZVr2Ra+t+piVaJ4gxaFaReZVH40AKNo7UCX6W+dEwBo/2oZJzqfuN1qLq1oL45o56cPaTXELwrTh8Fpggg==",
-      "dev": true
+      "integrity": "sha512-kY1AZVr2Ra+t+piVaJ4gxaFaReZVH40AKNo7UCX6W+dEwBo/2oZJzqfuN1qLq1oL45o56cPaTXELwrTh8Fpggg=="
     },
     "regexp.prototype.flags": {
       "version": "1.4.3",
diff --git a/package.json b/package.json
index 5f424e9..76bc97e 100644
--- a/package.json
+++ b/package.json
@@ -57,6 +57,8 @@
     "@types/lodash": "^4.14.195",
     "emoji-mart": "^5.5.2",
     "heroicons": "^2.0.18",
+    "i18next": "^23.1.0",
+    "i18next-browser-languagedetector": "^7.0.2",
     "lodash": "^4.17.21",
     "nostr-tools": "^1.11.2",
     "solid-js": "^1.7.5",
diff --git a/src/App.tsx b/src/App.tsx
index 09dec90..47ce437 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -5,12 +5,17 @@ import { persistQueryClient } from '@tanstack/query-persist-client-core';
 import { createSyncStoragePersister } from '@tanstack/query-sync-storage-persister';
 import { QueryClient, QueryClientProvider } from '@tanstack/solid-query';
 
+import i18nextInstance from '@/i18n/i18n';
+import { I18NextProvider } from '@/i18n/useTranslation';
+
 const Home = lazy(() => import('@/pages/Home'));
 const Hello = lazy(() => import('@/pages/Hello'));
 const NotFound = lazy(() => import('@/pages/NotFound'));
 
 const queryClient = new QueryClient({});
 
+const i18next = i18nextInstance();
+
 const localStoragePersister = createSyncStoragePersister({
   storage: window.localStorage,
 });
@@ -25,13 +30,15 @@ const App: Component = () => {
   });
 
   return (
-    <QueryClientProvider client={queryClient}>
-      <Routes>
-        <Route path="/hello" element={<Hello />} />
-        <Route path="/" element={<Home />} />
-        <Route path="/*" element={<NotFound />} />
-      </Routes>
-    </QueryClientProvider>
+    <I18NextProvider i18next={i18next}>
+      <QueryClientProvider client={queryClient}>
+        <Routes>
+          <Route path="/hello" element={<Hello />} />
+          <Route path="/" element={<Home />} />
+          <Route path="/*" element={<NotFound />} />
+        </Routes>
+      </QueryClientProvider>
+    </I18NextProvider>
   );
 };
 
diff --git a/src/components/column/BookmarkColumn.tsx b/src/components/column/BookmarkColumn.tsx
index c7126e5..399402f 100644
--- a/src/components/column/BookmarkColumn.tsx
+++ b/src/components/column/BookmarkColumn.tsx
@@ -8,6 +8,7 @@ import ColumnSettings from '@/components/column/ColumnSettings';
 import Bookmark from '@/components/timeline/Bookmark';
 import { BookmarkColumnType } from '@/core/column';
 import useConfig from '@/core/useConfig';
+import { useTranslation } from '@/i18n/useTranslation';
 import useDecrypt from '@/nostr/useDecrypt';
 import useParameterizedReplaceableEvent from '@/nostr/useParameterizedReplaceableEvent';
 
@@ -18,6 +19,7 @@ type BookmarkColumnDisplayProps = {
 };
 
 const BookmarkColumn: Component<BookmarkColumnDisplayProps> = (props) => {
+  const i18n = useTranslation();
   const { removeColumn } = useConfig();
 
   const { event } = useParameterizedReplaceableEvent(() => ({
@@ -30,7 +32,7 @@ const BookmarkColumn: Component<BookmarkColumnDisplayProps> = (props) => {
     <Column
       header={
         <BasicColumnHeader
-          name={props.column.name ?? 'ブックマーク'}
+          name={props.column.name ?? i18n()('column.bookmark')}
           icon={<BookmarkIcon />}
           settings={() => <ColumnSettings column={props.column} columnIndex={props.columnIndex} />}
           onClose={() => removeColumn(props.column.id)}
diff --git a/src/components/column/ChannelColumn.tsx b/src/components/column/ChannelColumn.tsx
index ea8cff2..0319495 100644
--- a/src/components/column/ChannelColumn.tsx
+++ b/src/components/column/ChannelColumn.tsx
@@ -11,7 +11,7 @@ import Timeline from '@/components/timeline/Timeline';
 import { ChannelColumnType, FollowingColumnType } from '@/core/column';
 import { applyContentFilter } from '@/core/contentFilter';
 import useConfig from '@/core/useConfig';
-import useFollowings from '@/nostr/useFollowings';
+import { useTranslation } from '@/i18n/useTranslation';
 import useSubscription from '@/nostr/useSubscription';
 import epoch from '@/utils/epoch';
 
@@ -22,6 +22,7 @@ export type ChannelColumnProps = {
 };
 
 const ChannelColumn: Component<ChannelColumnProps> = (props) => {
+  const i18n = useTranslation();
   const { config, removeColumn } = useConfig();
 
   const { events } = useSubscription(() => ({
@@ -44,7 +45,7 @@ const ChannelColumn: Component<ChannelColumnProps> = (props) => {
     <Column
       header={
         <BasicColumnHeader
-          name={props.column.name ?? 'チャンネル'}
+          name={props.column.name ?? i18n()('column.channel')}
           icon={<ChatBubbleLeftRight />}
           settings={() => <ColumnSettings column={props.column} columnIndex={props.columnIndex} />}
           onClose={() => removeColumn(props.column.id)}
diff --git a/src/components/column/ColumnSettings.tsx b/src/components/column/ColumnSettings.tsx
index 6168fdb..98d8e9f 100644
--- a/src/components/column/ColumnSettings.tsx
+++ b/src/components/column/ColumnSettings.tsx
@@ -7,6 +7,7 @@ import Trash from 'heroicons/24/outline/trash.svg';
 import { ColumnType } from '@/core/column';
 import useConfig from '@/core/useConfig';
 import { useRequestCommand } from '@/hooks/useCommandBus';
+import { useTranslation } from '@/i18n/useTranslation';
 
 type ColumnSettingsProps = {
   column: ColumnType;
@@ -28,6 +29,7 @@ const ColumnSettingsSection: Component<ColumnSettingsSectionProps> = (props) =>
 };
 
 const ColumnSettings: Component<ColumnSettingsProps> = (props) => {
+  const i18n = useTranslation();
   const { saveColumn, removeColumn, moveColumn } = useConfig();
   const request = useRequestCommand();
 
@@ -42,41 +44,49 @@ const ColumnSettings: Component<ColumnSettingsProps> = (props) => {
 
   return (
     <div class="flex flex-col border-t">
-      <ColumnSettingsSection title="カラム幅">
-        <div class="flex h-9 gap-2">
+      <ColumnSettingsSection title={i18n()('column.config.columnWidth')}>
+        <div class="scrollbar flex h-9 gap-2 overflow-x-scroll">
           <button
             class="rounded-md border px-4 hover:bg-stone-100"
             onClick={() => setColumnWidth('widest')}
           >
-            特大
+            {i18n()('column.config.widest')}
           </button>
           <button
             class="rounded-md border px-4 hover:bg-stone-100"
             onClick={() => setColumnWidth('wide')}
           >
-            大
+            {i18n()('column.config.wide')}
           </button>
           <button
             class="rounded-md border px-4 hover:bg-stone-100"
             onClick={() => setColumnWidth('medium')}
           >
-            中
+            {i18n()('column.config.medium')}
           </button>
           <button
             class="rounded-md border px-4 hover:bg-stone-100"
             onClick={() => setColumnWidth('narrow')}
           >
-            小
+            {i18n()('column.config.narrow')}
           </button>
         </div>
       </ColumnSettingsSection>
       <div class="flex h-10 items-center gap-2">
-        <button class="py-4 pl-2" title="左に移動" onClick={() => move(props.columnIndex - 1)}>
+        <button
+          class="py-4 pl-2"
+          title={i18n()('column.config.moveLeft')}
+          onClick={() => move(props.columnIndex - 1)}
+        >
           <span class="inline-block h-4 w-4">
             <ChevronLeft />
           </span>
         </button>
-        <button class="py-4 pr-2" title="右に移動" onClick={() => move(props.columnIndex + 1)}>
+        <button
+          class="py-4 pr-2"
+          title={i18n()('column.config.moveRight')}
+          onClick={() => move(props.columnIndex + 1)}
+        >
           <span class="inline-block h-4 w-4">
             <ChevronRight />
           </span>
@@ -84,10 +94,10 @@ const ColumnSettings: Component<ColumnSettingsProps> = (props) => {
         <div class="flex-1" />
         <button
           class="px-2 py-4 text-rose-500 hover:text-rose-600"
-          title="削除"
+          title={i18n()('column.config.removeColumn')}
           onClick={() => removeColumn(props.column.id)}
         >
-          <span class="inline-block h-4 w-4" aria-label="削除">
+          <span class="inline-block h-4 w-4" aria-label={i18n()('column.config.removeColumn')}>
             <Trash />
           </span>
         </button>
diff --git a/src/components/column/FollwingColumn.tsx b/src/components/column/FollwingColumn.tsx
index dfcc495..1432267 100644
--- a/src/components/column/FollwingColumn.tsx
+++ b/src/components/column/FollwingColumn.tsx
@@ -10,6 +10,7 @@ import Timeline from '@/components/timeline/Timeline';
 import { FollowingColumnType } from '@/core/column';
 import { applyContentFilter } from '@/core/contentFilter';
 import useConfig from '@/core/useConfig';
+import { useTranslation } from '@/i18n/useTranslation';
 import useFollowings from '@/nostr/useFollowings';
 import useSubscription from '@/nostr/useSubscription';
 import epoch from '@/utils/epoch';
@@ -21,6 +22,7 @@ type FollowingColumnDisplayProps = {
 };
 
 const FollowingColumn: Component<FollowingColumnDisplayProps> = (props) => {
+  const i18n = useTranslation();
   const { config, removeColumn } = useConfig();
 
   const { followingPubkeys } = useFollowings(() => ({ pubkey: props.column.pubkey }));
@@ -57,7 +59,7 @@ const FollowingColumn: Component<FollowingColumnDisplayProps> = (props) => {
     <Column
       header={
         <BasicColumnHeader
-          name={props.column.name ?? 'ホーム'}
+          name={props.column.name ?? i18n()('column.home')}
           icon={<Home />}
           settings={() => <ColumnSettings column={props.column} columnIndex={props.columnIndex} />}
           onClose={() => removeColumn(props.column.id)}
diff --git a/src/components/column/NotificationColumn.tsx b/src/components/column/NotificationColumn.tsx
index f9413c9..4b8a36d 100644
--- a/src/components/column/NotificationColumn.tsx
+++ b/src/components/column/NotificationColumn.tsx
@@ -9,6 +9,7 @@ import Notification from '@/components/timeline/Notification';
 import { NotificationColumnType } from '@/core/column';
 import { applyContentFilter } from '@/core/contentFilter';
 import useConfig from '@/core/useConfig';
+import { useTranslation } from '@/i18n/useTranslation';
 import useSubscription from '@/nostr/useSubscription';
 
 type NotificationColumnDisplayProps = {
@@ -18,6 +19,7 @@ type NotificationColumnDisplayProps = {
 };
 
 const NotificationColumn: Component<NotificationColumnDisplayProps> = (props) => {
+  const i18n = useTranslation();
   const { config, removeColumn } = useConfig();
 
   const { events: notifications } = useSubscription(() => ({
@@ -39,7 +41,7 @@ const NotificationColumn: Component<NotificationColumnDisplayProps> = (props) =>
     <Column
       header={
         <BasicColumnHeader
-          name={props.column.name ?? '通知'}
+          name={props.column.name ?? i18n()('column.notification')}
           icon={<Bell />}
           settings={() => <ColumnSettings column={props.column} columnIndex={props.columnIndex} />}
           onClose={() => removeColumn(props.column.id)}
diff --git a/src/components/column/PostsColumn.tsx b/src/components/column/PostsColumn.tsx
index 6e4af7f..4682867 100644
--- a/src/components/column/PostsColumn.tsx
+++ b/src/components/column/PostsColumn.tsx
@@ -9,6 +9,7 @@ import Timeline from '@/components/timeline/Timeline';
 import { PostsColumnType } from '@/core/column';
 import { applyContentFilter } from '@/core/contentFilter';
 import useConfig from '@/core/useConfig';
+import { useTranslation } from '@/i18n/useTranslation';
 import useSubscription from '@/nostr/useSubscription';
 
 type PostsColumnDisplayProps = {
@@ -18,6 +19,7 @@ type PostsColumnDisplayProps = {
 };
 
 const PostsColumn: Component<PostsColumnDisplayProps> = (props) => {
+  const i18n = useTranslation();
   const { config, removeColumn } = useConfig();
 
   const { events } = useSubscription(() => ({
@@ -39,7 +41,7 @@ const PostsColumn: Component<PostsColumnDisplayProps> = (props) => {
     <Column
       header={
         <BasicColumnHeader
-          name={props.column.name ?? '投稿'}
+          name={props.column.name ?? i18n()('column.posts')}
           icon={<User />}
           settings={() => <ColumnSettings column={props.column} columnIndex={props.columnIndex} />}
           onClose={() => removeColumn(props.column.id)}
diff --git a/src/components/column/ReactionsColumn.tsx b/src/components/column/ReactionsColumn.tsx
index 93f54c5..f53065f 100644
--- a/src/components/column/ReactionsColumn.tsx
+++ b/src/components/column/ReactionsColumn.tsx
@@ -9,6 +9,7 @@ import Notification from '@/components/timeline/Notification';
 import { ReactionsColumnType } from '@/core/column';
 import { applyContentFilter } from '@/core/contentFilter';
 import useConfig from '@/core/useConfig';
+import { useTranslation } from '@/i18n/useTranslation';
 import useSubscription from '@/nostr/useSubscription';
 
 type ReactionsColumnDisplayProps = {
@@ -18,6 +19,7 @@ type ReactionsColumnDisplayProps = {
 };
 
 const ReactionsColumn: Component<ReactionsColumnDisplayProps> = (props) => {
+  const i18n = useTranslation();
   const { config, removeColumn } = useConfig();
 
   const { events: reactions } = useSubscription(() => ({
@@ -39,7 +41,7 @@ const ReactionsColumn: Component<ReactionsColumnDisplayProps> = (props) => {
     <Column
       header={
         <BasicColumnHeader
-          name={props.column.name ?? 'リアクション'}
+          name={props.column.name ?? i18n()('column.reactions')}
           icon={<Heart />}
           settings={() => <ColumnSettings column={props.column} columnIndex={props.columnIndex} />}
           onClose={() => removeColumn(props.column.id)}
diff --git a/src/components/column/RelaysColumn.tsx b/src/components/column/RelaysColumn.tsx
index 8fc4a0b..d9fd8c2 100644
--- a/src/components/column/RelaysColumn.tsx
+++ b/src/components/column/RelaysColumn.tsx
@@ -9,6 +9,7 @@ import Timeline from '@/components/timeline/Timeline';
 import { RelaysColumnType } from '@/core/column';
 import { applyContentFilter } from '@/core/contentFilter';
 import useConfig from '@/core/useConfig';
+import { useTranslation } from '@/i18n/useTranslation';
 import useSubscription from '@/nostr/useSubscription';
 import epoch from '@/utils/epoch';
 
@@ -19,6 +20,7 @@ type RelaysColumnDisplayProps = {
 };
 
 const RelaysColumn: Component<RelaysColumnDisplayProps> = (props) => {
+  const i18n = useTranslation();
   const { removeColumn } = useConfig();
 
   const { events } = useSubscription(() => ({
@@ -40,7 +42,7 @@ const RelaysColumn: Component<RelaysColumnDisplayProps> = (props) => {
     <Column
       header={
         <BasicColumnHeader
-          name={props.column.name ?? 'リレー'}
+          name={props.column.name ?? i18n()('column.relay')}
           icon={<GlobeAlt />}
           settings={() => <ColumnSettings column={props.column} columnIndex={props.columnIndex} />}
           onClose={() => removeColumn(props.column.id)}
diff --git a/src/components/event/Reaction.tsx b/src/components/event/Reaction.tsx
index c15e2ef..bd47a83 100644
--- a/src/components/event/Reaction.tsx
+++ b/src/components/event/Reaction.tsx
@@ -7,6 +7,7 @@ import TextNoteDisplay from '@/components/event/textNote/TextNoteDisplay';
 import UserDisplayName from '@/components/UserDisplayName';
 import useConfig from '@/core/useConfig';
 import useModalState from '@/hooks/useModalState';
+import { useTranslation } from '@/i18n/useTranslation';
 import { genericEvent } from '@/nostr/event';
 import useEvent from '@/nostr/useEvent';
 import useProfile from '@/nostr/useProfile';
@@ -17,6 +18,7 @@ type ReactionProps = {
 };
 
 const Reaction: Component<ReactionProps> = (props) => {
+  const i18n = useTranslation();
   const { shouldMuteEvent } = useConfig();
   const { showProfile } = useModalState();
   const event = () => genericEvent(props.event);
@@ -65,7 +67,7 @@ const Reaction: Component<ReactionProps> = (props) => {
             >
               <UserDisplayName pubkey={props.event.pubkey} />
             </button>
-            {' がリアクション'}
+            {i18n()('notification.reacted')}
           </div>
         </div>
       </div>
diff --git a/src/components/event/Repost.tsx b/src/components/event/Repost.tsx
index ff80f9c..84a753a 100644
--- a/src/components/event/Repost.tsx
+++ b/src/components/event/Repost.tsx
@@ -9,6 +9,7 @@ import EventDisplayById from '@/components/event/EventDisplayById';
 import UserDisplayName from '@/components/UserDisplayName';
 import useFormatDate from '@/hooks/useFormatDate';
 import useModalState from '@/hooks/useModalState';
+import { useTranslation } from '@/i18n/useTranslation';
 import { genericEvent } from '@/nostr/event';
 
 export type RepostProps = {
@@ -16,6 +17,7 @@ export type RepostProps = {
 };
 
 const Repost: Component<RepostProps> = (props) => {
+  const i18n = useTranslation();
   const { showProfile } = useModalState();
   const formatDate = useFormatDate();
   const event = createMemo(() => genericEvent(props.event));
@@ -34,7 +36,7 @@ const Repost: Component<RepostProps> = (props) => {
           >
             <UserDisplayName pubkey={props.event.pubkey} />
           </button>
-          {' がリポスト'}
+          {i18n()('notification.reposted')}
         </div>
         <div>{formatDate(event().createdAtAsDate())}</div>
       </div>
diff --git a/src/components/event/ZapReceipt.tsx b/src/components/event/ZapReceipt.tsx
index 3cc8a0a..722510c 100644
--- a/src/components/event/ZapReceipt.tsx
+++ b/src/components/event/ZapReceipt.tsx
@@ -35,8 +35,7 @@ const ZapReceipt: Component<ZapReceiptProps> = (props) => {
 
   return (
     <Show when={!shouldMuteEvent(props.event)}>
-      ⚡
-      <UserNameDisplay pubkey={zapRequest().pubkey} />
+      ⚡{/* <UserNameDisplay pubkey={zapRequest().pubkey} /> */}
       <pre>{JSON.stringify(props.event, null, 2)}</pre>
     </Show>
   );
diff --git a/src/components/event/textNote/TextNoteDisplay.tsx b/src/components/event/textNote/TextNoteDisplay.tsx
index b03db3b..2565445 100644
--- a/src/components/event/textNote/TextNoteDisplay.tsx
+++ b/src/components/event/textNote/TextNoteDisplay.tsx
@@ -32,6 +32,7 @@ import Post from '@/components/Post';
 import { useTimelineContext } from '@/components/timeline/TimelineContext';
 import useConfig from '@/core/useConfig';
 import useModalState from '@/hooks/useModalState';
+import { useTranslation } from '@/i18n/useTranslation';
 import { textNote } from '@/nostr/event';
 import useCommands from '@/nostr/useCommands';
 import usePubkey from '@/nostr/usePubkey';
@@ -97,6 +98,7 @@ const EmojiReactions: Component<EmojiReactionsProps> = (props) => {
 };
 
 const TextNoteDisplay: Component<TextNoteDisplayProps> = (props) => {
+  const i18n = useTranslation();
   const { config } = useConfig();
   const pubkey = usePubkey();
   const { showProfile } = useModalState();
@@ -180,11 +182,11 @@ const TextNoteDisplay: Component<TextNoteDisplayProps> = (props) => {
       const succeeded = results.filter((res) => res.status === 'fulfilled').length;
       const failed = results.length - succeeded;
       if (succeeded === results.length) {
-        window.alert('削除しました（画面の反映にはリロード）');
+        window.alert(i18n()('post.deletedSuccessfully'));
       } else if (succeeded > 0) {
-        window.alert(`${failed}個のリレーで削除に失敗しました`);
+        window.alert(i18n()('post.failedToDeletePartially', { count: failed }));
       } else {
-        window.alert('すべてのリレーで削除に失敗しました');
+        window.alert(i18n()('post.failedToDelete'));
       }
     },
     onError: (err) => {
@@ -194,37 +196,37 @@ const TextNoteDisplay: Component<TextNoteDisplayProps> = (props) => {
 
   const menu: MenuItem[] = [
     {
-      content: () => 'IDをコピー',
+      content: () => i18n()('post.copyEventId'),
       onSelect: () => {
         navigator.clipboard.writeText(noteEncode(props.event.id)).catch((err) => window.alert(err));
       },
     },
     {
-      content: () => 'JSONを確認',
+      content: () => i18n()('post.showJSON'),
       onSelect: () => {
         setModal('EventDebugModal');
       },
     },
     {
-      content: () => 'リポスト一覧',
+      content: () => i18n()('post.showReposts'),
       onSelect: () => {
         setModal('Reposts');
       },
     },
     {
-      content: () => 'リアクション一覧',
+      content: () => i18n()('post.showReactions'),
       onSelect: () => {
         setModal('Reactions');
       },
     },
     {
       when: () => event().pubkey === pubkey(),
-      content: () => <span class="text-red-500">削除</span>,
+      content: () => <span class="text-red-500">{i18n()('post.deletePost')}</span>,
       onSelect: () => {
         const p = pubkey();
         if (p == null) return;
 
-        if (!window.confirm('本当に削除しますか？')) return;
+        if (!window.confirm(i18n()('post.confirmDelete'))) return;
         deleteMutation.mutate({
           relayUrls: config().relayUrls,
           pubkey: p,
@@ -326,6 +328,7 @@ const TextNoteDisplay: Component<TextNoteDisplayProps> = (props) => {
             </Show>
             <Show when={event().taggedPubkeys().length > 0}>
               <div class="text-xs">
+                {i18n()('post.replyToPre')}
                 <For each={event().taggedPubkeys()}>
                   {(replyToPubkey: string) => (
                     <button
@@ -339,7 +342,7 @@ const TextNoteDisplay: Component<TextNoteDisplayProps> = (props) => {
                     </button>
                   )}
                 </For>
-                {'への返信'}
+                {i18n()('post.replyToPost')}
               </div>
             </Show>
             <ContentWarningDisplay contentWarning={event().contentWarning()}>
diff --git a/src/components/modal/AddColumn.tsx b/src/components/modal/AddColumn.tsx
index 86c670b..8943470 100644
--- a/src/components/modal/AddColumn.tsx
+++ b/src/components/modal/AddColumn.tsx
@@ -20,6 +20,7 @@ import {
 } from '@/core/column';
 import useConfig from '@/core/useConfig';
 import { useRequestCommand } from '@/hooks/useCommandBus';
+import { useTranslation } from '@/i18n/useTranslation';
 import usePubkey from '@/nostr/usePubkey';
 import ensureNonNull from '@/utils/ensureNonNull';
 
@@ -28,6 +29,7 @@ type AddColumnProps = {
 };
 
 const AddColumn: Component<AddColumnProps> = (props) => {
+  const i18n = useTranslation();
   const pubkey = usePubkey();
   const { saveColumn } = useConfig();
   const request = useRequestCommand();
@@ -85,7 +87,7 @@ const AddColumn: Component<AddColumnProps> = (props) => {
           <span class="inline-block h-8 w-8">
             <Home />
           </span>
-          ホーム
+          {i18n()('column.home')}
         </button>
         <button
           class="flex basis-1/2 flex-col items-center gap-2 py-8 sm:basis-1/4"
@@ -94,7 +96,7 @@ const AddColumn: Component<AddColumnProps> = (props) => {
           <span class="inline-block h-8 w-8">
             <Bell />
           </span>
-          通知
+          {i18n()('column.notification')}
         </button>
         <button
           class="flex basis-1/2 flex-col items-center gap-2 py-8 sm:basis-1/4"
@@ -103,7 +105,7 @@ const AddColumn: Component<AddColumnProps> = (props) => {
           <span class="inline-block h-8 w-8">
             <GlobeAlt />
           </span>
-          日本リレー
+          {i18n()('column.japanese')}
         </button>
         {/*
         <button
@@ -134,7 +136,7 @@ const AddColumn: Component<AddColumnProps> = (props) => {
           <span class="inline-block h-8 w-8">
             <MagnifyingGlass />
           </span>
-          検索
+          {i18n()('column.search')}
         </button>
         <button
           class="flex basis-1/2 flex-col items-center gap-2 py-8 sm:basis-1/4"
@@ -143,7 +145,7 @@ const AddColumn: Component<AddColumnProps> = (props) => {
           <span class="inline-block h-8 w-8">
             <User />
           </span>
-          自分の投稿
+          {i18n()('column.myPosts')}
         </button>
         <button
           class="flex basis-1/2 flex-col items-center gap-2 py-8 sm:basis-1/4"
@@ -152,7 +154,7 @@ const AddColumn: Component<AddColumnProps> = (props) => {
           <span class="inline-block h-8 w-8">
             <Heart />
           </span>
-          自分のリアクション
+          {i18n()('column.myReactions')}
         </button>
       </div>
     </BasicModal>
diff --git a/src/components/modal/Config.tsx b/src/components/modal/Config.tsx
index 61b6ef2..3b92c93 100644
--- a/src/components/modal/Config.tsx
+++ b/src/components/modal/Config.tsx
@@ -12,6 +12,7 @@ import BasicModal from '@/components/modal/BasicModal';
 import UserNameDisplay from '@/components/UserDisplayName';
 import useConfig, { type Config } from '@/core/useConfig';
 import useModalState from '@/hooks/useModalState';
+import { useTranslation } from '@/i18n/useTranslation';
 import usePubkey from '@/nostr/usePubkey';
 import { simpleEmojiPackSchema, convertToEmojiConfig } from '@/utils/emojipack';
 import ensureNonNull from '@/utils/ensureNonNull';
@@ -26,12 +27,13 @@ const HttpUrlRegex = BaseUrlRegex('https?');
 const RelayUrlRegex = BaseUrlRegex('wss?');
 
 const ProfileSection = () => {
+  const i18n = useTranslation();
   const pubkey = usePubkey();
   const { showProfile, showProfileEdit } = useModalState();
 
   return (
     <div class="py-2">
-      <h3 class="font-bold">プロフィール</h3>
+      <h3 class="font-bold">{i18n()('config.profile.profile')}</h3>
       <div class="flex gap-2">
         <button
           class="rounded border border-rose-300 px-4 py-2 font-bold text-rose-300"
@@ -41,13 +43,13 @@ const ProfileSection = () => {
             })
           }
         >
-          開く
+          {i18n()('config.profile.openProfile')}
         </button>
         <button
           class="rounded border border-rose-300 px-4 py-2 font-bold text-rose-300"
           onClick={() => showProfileEdit()}
         >
-          編集
+          {i18n()('config.profile.editProfile')}
         </button>
       </div>
     </div>
@@ -55,6 +57,7 @@ const ProfileSection = () => {
 };
 
 const RelayConfig = () => {
+  const i18n = useTranslation();
   const { config, addRelay, removeRelay } = useConfig();
 
   const [relayUrlInput, setRelayUrlInput] = createSignal<string>('');
@@ -73,11 +76,11 @@ const RelayConfig = () => {
     const relayUrls = importedRelays.map(([relayUrl]) => relayUrl).join('\n');
 
     if (importedRelays.length === 0) {
-      window.alert('リレーが設定されていません');
+      window.alert(i18n()('config.relays.notConfigured'));
       return;
     }
 
-    if (!window.confirm(`これらのリレーをインポートしますか:\n${relayUrls}`)) {
+    if (!window.confirm(`${i18n()('config.relays.askImport')}\n\n${relayUrls}`)) {
       return;
     }
 
@@ -89,14 +92,16 @@ const RelayConfig = () => {
     });
     const currentCount = config().relayUrls.length;
     const importedCount = currentCount - lastCount;
-    window.alert(`${importedCount} 個のリレーをインポートしました`);
+    window.alert(i18n()('config.relays.imported', { count: importedCount }));
   };
 
   return (
     <>
       <div class="py-2">
-        <h3 class="font-bold">リレー</h3>
-        <p class="py-1">{config().relayUrls.length} 個のリレーが設定されています</p>
+        <h3 class="font-bold">{i18n()('config.relays.relays')}</h3>
+        <p class="py-1">
+          {i18n()('config.relays.numOfRelays', { count: config().relayUrls.length })}
+        </p>
         <ul>
           <For each={config().relayUrls}>
             {(relayUrl: string) => {
@@ -121,61 +126,62 @@ const RelayConfig = () => {
             onChange={(ev) => setRelayUrlInput(ev.currentTarget.value)}
           />
           <button type="submit" class="rounded bg-rose-300 p-2 font-bold text-white">
-            追加
+            {i18n()('config.relays.addRelay')}
           </button>
         </form>
       </div>
       <div class="py-2">
-        <h3 class="pb-1 font-bold">インポート</h3>
+        <h3 class="pb-1 font-bold">{i18n()('config.relays.importRelays')}</h3>
         <button
           type="button"
           class="rounded bg-rose-300 p-2 font-bold text-white"
           onClick={() => {
             importFromNIP07().catch((err) => {
               console.error('failed to import relays', err);
-              window.alert('インポートに失敗しました');
+              window.alert(i18n()('config.relays.failedToImport'));
             });
           }}
         >
-          拡張機能からインポート
+          {i18n()('config.relays.importFromExtension')}
         </button>
       </div>
     </>
   );
 };
 
-const dateFormats: {
-  id: Config['dateFormat'];
-  name: string;
-  example: string;
-}[] = [
-  {
-    id: 'relative',
-    name: '相対表記',
-    example: '7秒前',
-  },
-  {
-    id: 'absolute-short',
-    name: '絶対表記 (短形式)',
-    example: '昨日 23:55',
-  },
-  {
-    id: 'absolute-long',
-    name: '絶対表記 (長形式)',
-    example: '2020/11/8 21:02:53',
-  },
-];
-
 const DateFormatConfig = () => {
+  const i18n = useTranslation();
   const { config, setConfig } = useConfig();
 
+  const dateFormats: {
+    id: Config['dateFormat'];
+    name: string;
+    example: string;
+  }[] = [
+    {
+      id: 'relative',
+      name: i18n()('config.display.relativeTimeNotation'),
+      example: i18n()('config.display.relativeTimeNotationExample'),
+    },
+    {
+      id: 'absolute-short',
+      name: i18n()('config.display.absoluteTimeNotationShort'),
+      example: i18n()('config.display.absoluteTimeNotationShortExample'),
+    },
+    {
+      id: 'absolute-long',
+      name: i18n()('config.display.absoluteTimeNotationLong'),
+      example: i18n()('config.display.absoluteTimeNotationLongExample'),
+    },
+  ];
+
   const updateDateFormat = (dateFormat: Config['dateFormat']) => {
     setConfig((current) => ({ ...current, dateFormat }));
   };
 
   return (
     <div class="py-2">
-      <h3 class="font-bold">時刻の表記</h3>
+      <h3 class="font-bold">{i18n()('config.display.timeNotation')}</h3>
       <div class="flex flex-col justify-evenly gap-2 sm:flex-row">
         <For each={dateFormats}>
           {({ id, name, example }) => (
@@ -224,6 +230,7 @@ const ToggleButton = (props: {
 };
 
 const ReactionConfig = () => {
+  const i18n = useTranslation();
   const { config, setConfig } = useConfig();
 
   const toggleUseEmojiReaction = () => {
@@ -242,17 +249,17 @@ const ReactionConfig = () => {
 
   return (
     <div class="py-2">
-      <h3 class="font-bold">リアクション</h3>
+      <h3 class="font-bold">{i18n()('config.display.reaction')}</h3>
       <div class="flex flex-col justify-evenly gap-2">
         <div class="flex w-full">
-          <div class="flex-1">絵文字を選べるようにする</div>
+          <div class="flex-1">{i18n()('config.display.enableEmojiReaction')}</div>
           <ToggleButton
             value={config().useEmojiReaction}
             onClick={() => toggleUseEmojiReaction()}
           />
         </div>
         <div class="flex w-full">
-          <div class="flex-1">投稿にリアクションされた絵文字を表示する</div>
+          <div class="flex-1">{i18n()('config.display.showEmojiReaction')}</div>
           <ToggleButton
             value={config().showEmojiReaction}
             onClick={() => toggleShowEmojiReaction()}
@@ -264,6 +271,7 @@ const ReactionConfig = () => {
 };
 
 const EmojiConfig = () => {
+  const i18n = useTranslation();
   const { config, saveEmoji, removeEmoji } = useConfig();
 
   const [shortcodeInput, setShortcodeInput] = createSignal('');
@@ -279,7 +287,7 @@ const EmojiConfig = () => {
 
   return (
     <div class="py-2">
-      <h3 class="font-bold">カスタム絵文字</h3>
+      <h3 class="font-bold">{i18n()('config.customEmoji.customEmoji')}</h3>
       <ul class="flex flex-col gap-1 py-2">
         <For each={Object.values(config().customEmojis)}>
           {({ shortcode, url }) => (
@@ -295,7 +303,7 @@ const EmojiConfig = () => {
       </ul>
       <form class="flex flex-col gap-2" onSubmit={handleClickSaveEmoji}>
         <label class="flex flex-1 items-center gap-1">
-          <div class="w-9">名前</div>
+          <div class="w-9">{i18n()('config.customEmoji.shortcode')}</div>
           <input
             class="flex-1 rounded-md focus:border-rose-100 focus:ring-rose-300"
             type="text"
@@ -308,7 +316,7 @@ const EmojiConfig = () => {
           />
         </label>
         <label class="flex flex-1 items-center gap-1">
-          <div class="w-9">URL</div>
+          <div class="w-9">{i18n()('config.customEmoji.url')}</div>
           <input
             class="flex-1 rounded-md focus:border-rose-100 focus:ring-rose-300"
             type="text"
@@ -321,7 +329,7 @@ const EmojiConfig = () => {
           />
         </label>
         <button type="submit" class="w-24 self-end rounded bg-rose-300 p-2 font-bold text-white">
-          追加
+          {i18n()('config.customEmoji.addEmoji')}
         </button>
       </form>
     </div>
@@ -329,6 +337,7 @@ const EmojiConfig = () => {
 };
 
 const EmojiImport = () => {
+  const i18n = useTranslation();
   const { saveEmojis } = useConfig();
 
   const [jsonInput, setJSONInput] = createSignal('');
@@ -350,8 +359,8 @@ const EmojiImport = () => {
 
   return (
     <div class="py-2">
-      <h3 class="font-bold">絵文字のインポート</h3>
-      <p>絵文字の名前をキー、画像のURLを値とするJSONを読み込むことができます。</p>
+      <h3 class="font-bold">{i18n()('config.customEmoji.emojiImport')}</h3>
+      <p>{i18n()('config.customEmoji.emojiImportDescription')}</p>
       <form class="flex flex-col gap-2" onSubmit={handleClickSaveEmoji}>
         <textarea
           class="flex-1 rounded-md focus:border-rose-100 focus:ring-rose-300"
@@ -361,7 +370,7 @@ const EmojiImport = () => {
           onChange={(ev) => setJSONInput(ev.currentTarget.value)}
         />
         <button type="submit" class="w-24 self-end rounded bg-rose-300 p-2 font-bold text-white">
-          インポート
+          {i18n()('config.customEmoji.importEmoji')}
         </button>
       </form>
     </div>
@@ -369,6 +378,7 @@ const EmojiImport = () => {
 };
 
 const MuteConfig = () => {
+  const i18n = useTranslation();
   const { config, removeMutedPubkey, addMutedKeyword, removeMutedKeyword } = useConfig();
 
   const [keywordInput, setKeywordInput] = createSignal('');
@@ -383,7 +393,7 @@ const MuteConfig = () => {
   return (
     <>
       <div class="py-2">
-        <h3 class="font-bold">ミュートしたユーザ</h3>
+        <h3 class="font-bold">{i18n()('config.mute.mutedUsers')}</h3>
         <ul class="flex flex-col">
           <For each={config().mutedPubkeys}>
             {(pubkey) => (
@@ -400,7 +410,7 @@ const MuteConfig = () => {
         </ul>
       </div>
       <div class="py-2">
-        <h3 class="font-bold">ミュートした単語</h3>
+        <h3 class="font-bold">{i18n()('config.mute.mutedKeywords')}</h3>
         <ul class="flex flex-col">
           <For each={config().mutedKeywords}>
             {(keyword) => (
@@ -422,7 +432,7 @@ const MuteConfig = () => {
             onChange={(ev) => setKeywordInput(ev.currentTarget.value)}
           />
           <button type="submit" class="rounded bg-rose-300 p-2 font-bold text-white">
-            追加
+            {i18n()('config.mute.add')}
           </button>
         </form>
       </div>
@@ -431,6 +441,7 @@ const MuteConfig = () => {
 };
 
 const OtherConfig = () => {
+  const i18n = useTranslation();
   const { config, setConfig } = useConfig();
 
   const toggleKeepOpenPostForm = () => {
@@ -456,21 +467,21 @@ const OtherConfig = () => {
 
   return (
     <div class="py-2">
-      <h3 class="font-bold">その他</h3>
+      <h3 class="font-bold">{i18n()('config.display.others')}</h3>
       <div class="flex flex-col justify-evenly gap-2">
         <div class="flex w-full">
-          <div class="flex-1">投稿欄を開いたままにする</div>
+          <div class="flex-1">{i18n()('config.display.keepOpenPostForm')}</div>
           <ToggleButton
             value={config().keepOpenPostForm}
             onClick={() => toggleKeepOpenPostForm()}
           />
         </div>
         <div class="flex w-full">
-          <div class="flex-1">画像をデフォルトで表示する</div>
+          <div class="flex-1">{i18n()('config.display.showImagesByDefault')}</div>
           <ToggleButton value={config().showImage} onClick={() => toggleShowImage()} />
         </div>
         <div class="flex w-full">
-          <div class="flex-1">いいねやリポスト、フォロワーなどの数を隠す</div>
+          <div class="flex-1">{i18n()('config.display.hideNumbers')}</div>
           <ToggleButton value={config().hideCount} onClick={() => toggleHideCount()} />
         </div>
         {/*
@@ -489,21 +500,22 @@ const OtherConfig = () => {
 };
 
 const ConfigUI = (props: ConfigProps) => {
+  const i18n = useTranslation();
   const [menuIndex, setMenuIndex] = createSignal<number | null>(null);
 
   const menu = [
     {
-      name: () => 'プロフィール',
+      name: () => i18n()('config.profile.profile'),
       icon: () => <User />,
       render: () => <ProfileSection />,
     },
     {
-      name: () => 'リレー',
+      name: () => i18n()('config.relays.relays'),
       icon: () => <ServerStack />,
       render: () => <RelayConfig />,
     },
     {
-      name: () => '表示',
+      name: () => i18n()('config.display.display'),
       icon: () => <PaintBrush />,
       render: () => (
         <>
@@ -514,7 +526,7 @@ const ConfigUI = (props: ConfigProps) => {
       ),
     },
     {
-      name: () => 'カスタム絵文字',
+      name: () => i18n()('config.customEmoji.customEmoji'),
       icon: () => <FaceSmile />,
       render: () => (
         <>
@@ -524,7 +536,7 @@ const ConfigUI = (props: ConfigProps) => {
       ),
     },
     {
-      name: () => 'ミュート',
+      name: () => i18n()('config.mute.mute'),
       icon: () => <EyeSlash />,
       render: () => <MuteConfig />,
     },
@@ -543,7 +555,7 @@ const ConfigUI = (props: ConfigProps) => {
           when={getMenuItem()}
           fallback={
             <>
-              <h2 class="flex-1 text-center text-lg font-bold">設定</h2>
+              <h2 class="flex-1 text-center text-lg font-bold">{i18n()('config.config')}</h2>
               <ul class="flex flex-col">
                 <For each={menu}>
                   {(menuItem, i) => (
diff --git a/src/components/modal/ProfileDisplay.tsx b/src/components/modal/ProfileDisplay.tsx
index d93686c..9c1f0c0 100644
--- a/src/components/modal/ProfileDisplay.tsx
+++ b/src/components/modal/ProfileDisplay.tsx
@@ -15,6 +15,7 @@ import Timeline from '@/components/timeline/Timeline';
 import SafeLink from '@/components/utils/SafeLink';
 import useConfig from '@/core/useConfig';
 import useModalState from '@/hooks/useModalState';
+import { useTranslation } from '@/i18n/useTranslation';
 import useCommands from '@/nostr/useCommands';
 import useFollowers from '@/nostr/useFollowers';
 import useFollowings from '@/nostr/useFollowings';
@@ -42,6 +43,7 @@ const FollowersCount: Component<{ pubkey: string }> = (props) => {
 };
 
 const ProfileDisplay: Component<ProfileDisplayProps> = (props) => {
+  const i18n = useTranslation();
   const { config, addMutedPubkey, removeMutedPubkey, isPubkeyMuted } = useConfig();
   const commands = useCommands();
   const myPubkey = usePubkey();
@@ -52,7 +54,7 @@ const ProfileDisplay: Component<ProfileDisplayProps> = (props) => {
   const [updatingContacts, setUpdatingContacts] = createSignal(false);
   const [hoverFollowButton, setHoverFollowButton] = createSignal(false);
   const [showFollowers, setShowFollowers] = createSignal(false);
-  const [modal, setModal] = createSignal<'Following' | null>(false);
+  const [modal, setModal] = createSignal<'Following' | null>(null);
   const closeModal = () => setModal(null);
 
   const { profile, query: profileQuery } = useProfile(() => ({
@@ -169,13 +171,13 @@ const ProfileDisplay: Component<ProfileDisplayProps> = (props) => {
     },
      */
     {
-      content: () => 'IDをコピー',
+      content: () => i18n()('profile.copyPubkey'),
       onSelect: () => {
         navigator.clipboard.writeText(npub()).catch((err) => window.alert(err));
       },
     },
     {
-      content: () => (!isMuted() ? 'ミュート' : 'ミュート解除'),
+      content: () => (!isMuted() ? i18n()('profile.mute') : i18n()('profile.unmute')),
       onSelect: () => {
         if (!isMuted()) {
           addMutedPubkey(props.pubkey);
@@ -186,7 +188,8 @@ const ProfileDisplay: Component<ProfileDisplayProps> = (props) => {
     },
     {
       when: () => props.pubkey === myPubkey(),
-      content: () => (!following() ? '自分をフォロー' : '自分をフォロー解除'),
+      content: () =>
+        !following() ? i18n()('profile.followMyself') : i18n()('profile.unfollowMyself'),
       onSelect: () => {
         if (!following()) {
           follow();
@@ -243,17 +246,17 @@ const ProfileDisplay: Component<ProfileDisplayProps> = (props) => {
                     text-center font-bold text-primary hover:bg-primary hover:text-white sm:w-20"
                     onClick={() => showProfileEdit()}
                   >
-                    編集
+                    {i18n()('profile.editProfile')}
                   </button>
                 </Match>
                 <Match when={updateContactsMutation.isLoading || updatingContacts()}>
                   <span class="rounded-full border border-primary px-4 py-2 text-primary sm:text-base">
-                    更新中
+                    {i18n()('profile.updating')}
                   </span>
                 </Match>
                 <Match when={myFollowingQuery.isLoading || myFollowingQuery.isFetching}>
                   <span class="rounded-full border border-primary px-4 py-2 text-primary sm:text-base">
-                    読み込み中
+                    {i18n()('profile.loading')}
                   </span>
                 </Match>
                 <Match when={following()}>
@@ -265,8 +268,8 @@ const ProfileDisplay: Component<ProfileDisplayProps> = (props) => {
                     onClick={() => unfollow()}
                     disabled={updateContactsMutation.isLoading}
                   >
-                    <Show when={!hoverFollowButton()} fallback="フォロー解除">
-                      フォロー中
+                    <Show when={!hoverFollowButton()} fallback={i18n()('profile.unfollow')}>
+                      {i18n()('profile.followingCurrently')}
                     </Show>
                   </button>
                 </Match>
@@ -277,7 +280,7 @@ const ProfileDisplay: Component<ProfileDisplayProps> = (props) => {
                     onClick={() => follow()}
                     disabled={updateContactsMutation.isLoading}
                   >
-                    フォロー
+                    {i18n()('profile.follow')}
                   </button>
                 </Match>
               </Switch>
@@ -292,10 +295,10 @@ const ProfileDisplay: Component<ProfileDisplayProps> = (props) => {
             </div>
             <Switch>
               <Match when={userFollowingQuery.isLoading}>
-                <div class="shrink-0 text-xs">読み込み中</div>
+                <div class="shrink-0 text-xs">{i18n()('profile.loading')}</div>
               </Match>
               <Match when={followed()}>
-                <div class="shrink-0 text-xs">フォローされています</div>
+                <div class="shrink-0 text-xs">{i18n()('profile.followsYou')}</div>
               </Match>
             </Switch>
           </div>
diff --git a/src/i18n/i18n.ts b/src/i18n/i18n.ts
new file mode 100644
index 0000000..b5e1b07
--- /dev/null
+++ b/src/i18n/i18n.ts
@@ -0,0 +1,22 @@
+import i18next from 'i18next';
+import LanguageDetector from 'i18next-browser-languagedetector';
+
+import en from '@/locales/en';
+import ja from '@/locales/ja';
+
+const i18nextInstance = (): Promise<void | typeof i18next.t> =>
+  i18next
+    .use(LanguageDetector)
+    .init({
+      fallbackLng: 'en',
+      debug: true,
+      resources: {
+        ja: { translation: ja },
+        en: { translation: en satisfies typeof ja },
+      },
+    })
+    .catch((err) => {
+      console.error('failed to setup i18next', err);
+    });
+
+export default i18nextInstance;
diff --git a/src/i18n/useTranslation.tsx b/src/i18n/useTranslation.tsx
new file mode 100644
index 0000000..e17122b
--- /dev/null
+++ b/src/i18n/useTranslation.tsx
@@ -0,0 +1,39 @@
+import { Component, JSX, createContext, createEffect, createSignal, useContext } from 'solid-js';
+
+import i18next from 'i18next';
+
+type I18Next = typeof i18next.t;
+
+export type I18NextProviderProps = {
+  i18next: I18Next | Promise<I18Next | void> | void;
+  children?: JSX.Element;
+};
+
+const I18NextContext = createContext<I18Next | Promise<I18Next | void> | void>();
+
+export const useTranslation = () => {
+  const [i18nextFn, setI18nextFn] = createSignal<I18Next>(i18next.t);
+  const maybePromise = useContext(I18NextContext);
+
+  createEffect(() => {
+    if (maybePromise instanceof Promise) {
+      maybePromise
+        .then((instance) => {
+          if (instance != null) {
+            setI18nextFn(() => instance);
+          }
+        })
+        .catch((err) => {
+          console.error('failed to initialize i18next', err);
+        });
+    } else if (maybePromise != null) {
+      setI18nextFn(() => maybePromise);
+    }
+  });
+
+  return i18nextFn;
+};
+
+export const I18NextProvider: Component<I18NextProviderProps> = (props) => {
+  return <I18NextContext.Provider value={props.i18next}>{props.children}</I18NextContext.Provider>;
+};
diff --git a/src/locales/en.ts b/src/locales/en.ts
new file mode 100644
index 0000000..f8701bf
--- /dev/null
+++ b/src/locales/en.ts
@@ -0,0 +1,125 @@
+import ja from '@/locales/ja';
+
+export default {
+  posting: {
+    placeholder: "What's happening?",
+    contentWarning: 'Content warning',
+    uploadImage: 'Upload image',
+    submit: 'Submit',
+  },
+  column: {
+    home: 'Home',
+    notification: 'Notification',
+    relay: 'Relay',
+    japanese: 'Japanese',
+    posts: 'User',
+    reactions: 'Reactions',
+    channel: 'Channel',
+    bookmark: 'Bookmark',
+    search: 'Search',
+    myPosts: 'My posts',
+    myReactions: 'My reactions',
+    config: {
+      columnWidth: 'Column width',
+      widest: 'Widest',
+      wide: 'Wide',
+      medium: 'Medium',
+      narrow: 'Narrow',
+      moveLeft: 'Move left',
+      moveRight: 'Move right',
+      removeColumn: 'Remove',
+    },
+  },
+  profile: {
+    following: 'Following',
+    followers: 'Followers',
+    loadFollowers: 'Load',
+    loading: 'Loading',
+    updating: 'Updating',
+    editProfile: 'Edit',
+    follow: 'Follow',
+    unfollow: 'Unfollow',
+    followingCurrently: 'Following',
+    followsYou: 'follows you',
+    copyPubkey: 'Copy ID',
+    mute: 'Mute',
+    unmute: 'Unmute',
+    followMyself: 'Follow myself',
+    unfollowMyself: 'Unfollow myself',
+  },
+  post: {
+    replyToPre: 'Replying to ',
+    replyToPost: '',
+    copyEventId: 'Copy ID',
+    showJSON: 'Show JSON',
+    showReposts: 'Show reposts',
+    showReactions: 'Show reactions',
+    deletePost: 'Delete',
+    confirmDelete: 'Do you really want to delete?',
+    deletedSuccessfully: 'Deleted successfully (reload to reflect)',
+    failedToDeletePartially: 'Failed to delete on {{count}} relays',
+    failedToDelete: 'Failed to delete',
+  },
+  notification: {
+    reposted: ' reposted',
+    reacted: ' reacted',
+  },
+  config: {
+    config: 'Settings',
+    profile: {
+      profile: 'Profile',
+      openProfile: 'Open',
+      editProfile: 'Edit',
+    },
+    relays: {
+      relays: 'Relays',
+      numOfRelays_one: '{{count}} relay are configured.',
+      numOfRelays_other: '{{count}} relyas are configured.',
+      addRelay: 'Add',
+      importRelays: 'Import',
+      importFromExtension: 'Import from browser extension',
+      notConfigured: 'No relays are configured.',
+      askImport: 'Do you want to import these relays?',
+      failedToImport: 'Failed to import.',
+      imported_one: 'Imported {{count}} relay.',
+      imported_other: 'Imported {{count}} relyas',
+    },
+    display: {
+      display: 'Display',
+      timeNotation: 'Time notation',
+      relativeTimeNotation: 'Relative',
+      relativeTimeNotationExample: '7s',
+      absoluteTimeNotationShort: 'Absolute (short)',
+      absoluteTimeNotationShortExample: 'Yesterday 23:55',
+      absoluteTimeNotationLong: 'Absolute (long)',
+      absoluteTimeNotationLongExample: '2020/11/8 21:02:53',
+      reaction: 'Reaction',
+      enableEmojiReaction: 'Enable emoji reaction',
+      showEmojiReaction: 'Show emoji reactions on posts',
+      others: 'Others',
+      keepOpenPostForm: 'Remain the input field open after posting',
+      showImagesByDefault: 'Load images by default',
+      hideNumbers: 'Hide the numbers of reactions, reposts and followers',
+    },
+    customEmoji: {
+      customEmoji: 'Custom emojis',
+      shortcode: 'Name',
+      url: 'URL',
+      addEmoji: 'Add',
+      emojiImport: 'Emoji import',
+      emojiImportDescription: 'Paste a JSON where the keys are names and the values are image URLs',
+      importEmoji: 'Import',
+    },
+    mute: {
+      mute: 'Mute',
+      mutedUsers: 'Muted users',
+      mutedKeywords: 'Muted keywords',
+      add: 'Add',
+    },
+  },
+  hello: {
+    signerChecking: 'Checking that browser extension is installed...',
+    signerUnavailable: 'Please install NIP-07 browser extension.',
+    loginWithSigner: 'Login with NIP-07 browser extension',
+  },
+};
diff --git a/src/locales/ja.ts b/src/locales/ja.ts
new file mode 100644
index 0000000..e67e615
--- /dev/null
+++ b/src/locales/ja.ts
@@ -0,0 +1,124 @@
+export default {
+  posting: {
+    placeholder: 'いまどうしてる？',
+    contentWarning: 'コンテンツ警告を設定',
+    uploadImage: '画像を投稿',
+    submit: '投稿',
+  },
+  column: {
+    home: 'ホーム',
+    notification: '通知',
+    relay: 'リレー',
+    japanese: '日本語',
+    posts: '投稿',
+    reactions: 'リアクション',
+    channel: 'チャンネル',
+    bookmark: 'ブックマーク',
+    search: '検索',
+    myPosts: '自分の投稿',
+    myReactions: '自分のリアクション',
+    config: {
+      columnWidth: 'カラム幅',
+      widest: '特大',
+      wide: '大',
+      medium: '中',
+      narrow: '小',
+      moveLeft: '左に移動',
+      moveRight: '右に移動',
+      removeColumn: '削除',
+    },
+  },
+  profile: {
+    following: 'フォロー',
+    followers: 'フォロワー',
+    loadFollowers: '読み込む',
+    loading: '読み込み中',
+    updating: '更新中',
+    editProfile: '編集',
+    follow: 'フォロー',
+    unfollow: 'フォロー解除',
+    followingCurrently: 'フォロー中',
+    followsYou: 'フォローされています',
+    copyPubkey: 'IDをコピー',
+    mute: 'ミュート',
+    unmute: 'ミュート解除',
+    followMyself: '自分をフォロー',
+    unfollowMyself: '自分をフォロー解除',
+  },
+  post: {
+    replyToPre: '',
+    replyToPost: 'への返信',
+    copyEventId: 'IDをコピー',
+    showJSON: 'JSONを確認',
+    showReposts: 'リポスト一覧',
+    showReactions: 'リアクション一覧',
+    deletePost: '削除',
+    confirmDelete: '本当に削除しますか？',
+    deletedSuccessfully: '削除しました（画面への反映にはリロード）',
+    failedToDeletePartially: '{{count}}個のリレーで削除に失敗しました',
+    failedToDelete: 'すべてのリレーで削除に失敗しました',
+  },
+  notification: {
+    reposted: 'がリポスト',
+    reacted: 'がリアクション',
+  },
+  config: {
+    config: '設定',
+    profile: {
+      profile: 'プロフィール',
+      openProfile: '開く',
+      editProfile: '編集',
+    },
+    relays: {
+      relays: 'リレー',
+      numOfRelays_one: '{{count}}個のリレーが設定されています。',
+      numOfRelays_other: '{{count}}個のリレーが設定されています。',
+      addRelay: '追加',
+      importRelays: 'インポート',
+      importFromExtension: '拡張機能からインポート',
+      notConfigured: 'リレーが設定されていません',
+      askImport: 'これらのリレーをインポートしますか？',
+      failedToImport: 'インポートに失敗しました',
+      imported_one: '{{count}}個のリレーをインポートしました',
+      imported_other: '{{count}}個のリレーをインポートしました',
+    },
+    display: {
+      display: '表示',
+      timeNotation: '時刻の表記',
+      relativeTimeNotation: '相対表記',
+      relativeTimeNotationExample: '7秒前',
+      absoluteTimeNotationShort: '絶対表記 (短形式)',
+      absoluteTimeNotationShortExample: '昨日 23:55',
+      absoluteTimeNotationLong: '絶対表記 (長形式)',
+      absoluteTimeNotationLongExample: '2020/11/8 21:02:53',
+      reaction: 'リアクション',
+      enableEmojiReaction: '絵文字を選べるようにする',
+      showEmojiReaction: '投稿にリアクションされた絵文字を表示する',
+      others: 'その他',
+      keepOpenPostForm: '投稿後も投稿欄を開いたままにする',
+      showImagesByDefault: 'デフォルトで画像を読み込む',
+      hideNumbers: 'いいねやリポスト、フォロワーなどの数を隠す',
+    },
+    customEmoji: {
+      customEmoji: 'カスタム絵文字',
+      shortcode: '名前',
+      url: 'URL',
+      addEmoji: '追加',
+      emojiImport: '絵文字のインポート',
+      emojiImportDescription:
+        '絵文字の名前をキー、画像のURLを値とするJSONを読み込むことができます。',
+      importEmoji: 'インポート',
+    },
+    mute: {
+      mute: 'ミュート',
+      mutedUsers: 'ミュートしたユーザ',
+      mutedKeywords: 'ミュートした単語',
+      add: '追加',
+    },
+  },
+  hello: {
+    signerChecking: '拡張機能のインストール状況を確認中です...',
+    signerUnavailable: '利用にはNIP-07に対応した拡張機能が必要です。',
+    loginWithSigner: 'NIP-07 拡張機能でログイン',
+  },
+};
diff --git a/src/nostr/useReposts.ts b/src/nostr/useReposts.ts
index 962479f..aa4abdd 100644
--- a/src/nostr/useReposts.ts
+++ b/src/nostr/useReposts.ts
@@ -4,7 +4,7 @@ import { createQuery, useQueryClient, type CreateQueryResult } from '@tanstack/s
 import { Event as NostrEvent } from 'nostr-tools';
 
 import useConfig from '@/core/useConfig';
-import { BatchedEventsTask, exec, registerTask } from '@/nostr/useBatchedEvents';
+import { BatchedEventsTask, registerTask } from '@/nostr/useBatchedEvents';
 import timeout from '@/utils/timeout';
 
 export type UseRepostsProps = {
diff --git a/src/pages/Hello.tsx b/src/pages/Hello.tsx
index a3414ca..f46263c 100644
--- a/src/pages/Hello.tsx
+++ b/src/pages/Hello.tsx
@@ -3,6 +3,7 @@ import { createSignal, onMount, Switch, Match, type Component } from 'solid-js';
 import { useNavigate } from '@solidjs/router';
 
 import usePersistStatus from '@/hooks/usePersistStatus';
+import { useTranslation } from '@/i18n/useTranslation';
 import resolveAsset from '@/utils/resolveAsset';
 
 type SignerStatus = 'checking' | 'available' | 'unavailable';
@@ -31,6 +32,7 @@ const useSignerStatus = () => {
 };
 
 const Hello: Component = () => {
+  const i18n = useTranslation();
   const signerStatus = useSignerStatus();
   const navigate = useNavigate();
   const { persistStatus, loggedIn } = usePersistStatus();
@@ -61,10 +63,10 @@ const Hello: Component = () => {
       <div class="rounded-md p-8 shadow-md">
         <Switch>
           <Match when={signerStatus() === 'checking'}>
-            <p>拡張機能のインストール状況を確認中です...</p>
+            <p>{i18n()('hello.signerChecking')}</p>
           </Match>
           <Match when={signerStatus() === 'unavailable'}>
-            <h2 class="font-bold">利用にはNIP-07に対応した拡張機能が必要です。</h2>
+            <h2 class="font-bold">{i18n()('hello.signerUnavailable')}</h2>
             <p>
               <br />
               初めて利用する方も、他のクライアントをつかっている方も
@@ -87,7 +89,7 @@ const Hello: Component = () => {
               class="rounded bg-rose-400 p-4 text-lg font-bold text-white hover:shadow-md"
               onClick={handleLogin}
             >
-              NIP-07 拡張機能でログイン
+              {i18n()('hello.loginWithSigner')}
             </button>
           </Match>
         </Switch>
diff --git a/src/types/i18next.d.ts b/src/types/i18next.d.ts
new file mode 100644
index 0000000..558136a
--- /dev/null
+++ b/src/types/i18next.d.ts
@@ -0,0 +1,12 @@
+import 'i18next';
+
+import ja from '@/locales/ja';
+
+declare module 'i18next' {
+  interface CustomTypeOptions {
+    defaultNS: 'translation';
+    resources: {
+      translation: typeof ja;
+    };
+  }
+}
diff --git a/tsconfig.json b/tsconfig.json
index f19e126..f651c6b 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -4,6 +4,7 @@
     "target": "ESNext",
     "module": "ESNext",
     "moduleResolution": "node",
+    "resolveJsonModule": true,
     "lib": [
       "dom",
       "dom.iterable",