diff --git a/src/components/EmojiPicker.tsx b/src/components/EmojiPicker.tsx
index f2d7c34..49168ad 100644
--- a/src/components/EmojiPicker.tsx
+++ b/src/components/EmojiPicker.tsx
@@ -3,17 +3,34 @@ import { Component, JSX, createSignal } from 'solid-js';
 import { Picker } from 'emoji-mart';
 
 import Popup, { PopupRef } from '@/components/utils/Popup';
+import useConfig from '@/core/useConfig';
 
 type EmojiPickerProps = {
   onEmojiSelect?: (emoji: string) => void;
+  customEmojis?: boolean;
   children: JSX.Element;
 };
 
 const EmojiPicker: Component<EmojiPickerProps> = (props) => {
   let popupRef: PopupRef | undefined;
 
+  const { config } = useConfig();
   const [pickerElement, setPickerElement] = createSignal<HTMLElement | undefined>(undefined);
 
+  /*
+  const buildCustom = () => {
+    const emojis = Object.values(config().customEmojis).map(({ shortcode, url }) => ({
+      id: shortcode,
+      name: shortcode,
+      keywords: [shortcode],
+      skins: [{ src: url }],
+    }));
+
+    console.log(emojis);
+    return [{ id: 'custom_rabbit', name: 'カスタム絵文字', emojis }];
+  };
+   */
+
   const handleOpen = () => {
     const picker = new Picker({
       data: async () => {
@@ -24,11 +41,12 @@ const EmojiPicker: Component<EmojiPickerProps> = (props) => {
         const response = await fetch('https://cdn.jsdelivr.net/npm/@emoji-mart/data/i18n/ja.json');
         return response.json();
       },
+      // custom: props.customEmojis ? buildCustom() : [],
       autoFocus: false,
       locale: 'ja',
       theme: 'light',
-      onEmojiSelect: (emoji: { id: string; native: string }) => {
-        props.onEmojiSelect?.(emoji.native);
+      onEmojiSelect: (emoji: { id: string; native?: string }) => {
+        props.onEmojiSelect?.(emoji.native ?? `:${emoji.id}:`);
         popupRef?.close();
       },
     });
diff --git a/src/components/NotePostForm.tsx b/src/components/NotePostForm.tsx
index d67f713..e9cc582 100644
--- a/src/components/NotePostForm.tsx
+++ b/src/components/NotePostForm.tsx
@@ -1,21 +1,14 @@
-import {
-  createSignal,
-  createMemo,
-  onMount,
-  Show,
-  For,
-  type Component,
-  type JSX,
-  type Accessor,
-} from 'solid-js';
+import { createSignal, createMemo, onMount, Show, For, type Component, type JSX } from 'solid-js';
 
 import { createMutation } from '@tanstack/solid-query';
+import FaceSmile from 'heroicons/24/outline/face-smile.svg';
 import Photo from 'heroicons/24/outline/photo.svg';
 import XMark from 'heroicons/24/outline/x-mark.svg';
 import PaperAirplane from 'heroicons/24/solid/paper-airplane.svg';
 import uniq from 'lodash/uniq';
 import { Event as NostrEvent } from 'nostr-tools';
 
+import EmojiPicker from '@/components/EmojiPicker';
 import UserNameDisplay from '@/components/UserDisplayName';
 import useConfig from '@/core/useConfig';
 import { useHandleCommand } from '@/hooks/useCommandBus';
@@ -48,12 +41,13 @@ const extract = (parsed: ParsedTextNote) => {
   const pubkeyReferences: string[] = [];
   const eventReferences: string[] = [];
   const urlReferences: string[] = [];
+  const emojis: string[] = [];
 
   parsed.forEach((node) => {
-    if (node.type === 'HashTag') {
-      hashtags.push(node.tagName);
-    } else if (node.type === 'URL') {
+    if (node.type === 'URL') {
       urlReferences.push(node.content);
+    } else if (node.type === 'HashTag') {
+      hashtags.push(node.tagName);
     } else if (node.type === 'Bech32Entity') {
       if (node.data.type === 'npub') {
         pubkeyReferences.push(node.data.data);
@@ -63,14 +57,17 @@ const extract = (parsed: ParsedTextNote) => {
       // TODO nevent can contain an event not only textnote (kind:1).
       // In my understanding, it is not allowed to include other kinds of events in `tags`.
       // It is needed to verify that the kind of the event is 1.
+    } else if (node.type === 'CustomEmoji' && !emojis.includes(node.shortcode)) {
+      emojis.push(node.shortcode);
     }
   });
 
   return {
     hashtags,
+    urlReferences,
     pubkeyReferences,
     eventReferences,
-    urlReferences,
+    emojis,
   };
 };
 
@@ -94,6 +91,8 @@ const NotePostForm: Component<NotePostFormProps> = (props) => {
   const [contentWarning, setContentWarning] = createSignal(false);
   const [contentWarningReason, setContentWarningReason] = createSignal('');
 
+  const appendText = (s: string) => setText((current) => `${current} ${s}`);
+
   const clearText = () => {
     setText('');
     setContentWarningReason('');
@@ -106,7 +105,7 @@ const NotePostForm: Component<NotePostFormProps> = (props) => {
     props.onClose();
   };
 
-  const { config } = useConfig();
+  const { config, getEmoji } = useConfig();
   const getPubkey = usePubkey();
   const commands = useCommands();
 
@@ -140,7 +139,7 @@ const NotePostForm: Component<NotePostFormProps> = (props) => {
           uploadResults.forEach((result) => {
             if (result.status === 'fulfilled') {
               console.log('succeeded to upload', result);
-              setText((current) => `${current} ${result.value.imageUrl}`);
+              appendText(result.value.imageUrl);
               resizeTextArea();
             } else {
               console.error('failed to upload', result);
@@ -169,6 +168,19 @@ const NotePostForm: Component<NotePostFormProps> = (props) => {
     ]);
   };
 
+  const buildEmojiTags = (emojis: string[]): string[][] => {
+    const emojiTags: string[][] = [];
+
+    emojis.forEach((shortcode) => {
+      const emoji = getEmoji(shortcode);
+      if (emoji != null) {
+        emojiTags.push(['emoji', shortcode, emoji.url]);
+      }
+    });
+
+    return emojiTags;
+  };
+
   const submit = () => {
     if (text().length === 0) return;
     if (publishTextNoteMutation.isLoading) return;
@@ -180,8 +192,9 @@ const NotePostForm: Component<NotePostFormProps> = (props) => {
     }
 
     const parsed = parseTextNote(text());
-    const { hashtags, pubkeyReferences, eventReferences, urlReferences } = extract(parsed);
+    const { hashtags, urlReferences, pubkeyReferences, eventReferences, emojis } = extract(parsed);
     const formattedContent = format(parsed);
+    const emojiTags = buildEmojiTags(emojis);
 
     let textNote: PublishTextNoteParams = {
       relayUrls: config().relayUrls,
@@ -191,6 +204,7 @@ const NotePostForm: Component<NotePostFormProps> = (props) => {
       mentionEventIds: eventReferences,
       hashtags,
       urls: urlReferences,
+      tags: emojiTags,
     };
 
     if (replyTo() != null) {
@@ -329,6 +343,13 @@ const NotePostForm: Component<NotePostFormProps> = (props) => {
               </button>
             </div>
           </Show>
+          {/*
+          <EmojiPicker customEmojis={true} onEmojiSelect={(emoji) => appendText(emoji)}>
+            <span class="inline-block h-8 w-8 rounded bg-primary p-2 font-bold text-white">
+              <FaceSmile />
+            </span>
+          </EmojiPicker>
+          */}
           <button
             class="flex items-center justify-center rounded p-2 text-xs font-bold text-white"
             classList={{
diff --git a/src/components/modal/Config.tsx b/src/components/modal/Config.tsx
index e47947a..8039275 100644
--- a/src/components/modal/Config.tsx
+++ b/src/components/modal/Config.tsx
@@ -13,6 +13,11 @@ type ConfigProps = {
   onClose: () => void;
 };
 
+const BaseUrlRegex = (schemaRegex: string) =>
+  `^(?:${schemaRegex})://[-a-zA-Z0-9.]+(:\\d{1,5})?(?:/[-[\\]~!$&'()*+.,:;@&=%\\w]+|/)*(?:\\?[-[\\]~!$&'()*+.,/:;%@&=\\w?]+)?(?:#[-[\\]~!$&'()*+.,/:;%@\\w&=?#]+)?$`;
+const HttpUrlRegex = BaseUrlRegex('https?');
+const RelayUrlRegex = BaseUrlRegex('wss?');
+
 const ProfileSection = () => {
   const pubkey = usePubkey();
   const { showProfile, showProfileEdit } = useModalState();
@@ -77,6 +82,7 @@ const RelayConfig = () => {
           type="text"
           name="relayUrl"
           value={relayUrlInput()}
+          pattern={RelayUrlRegex}
           onChange={(ev) => setRelayUrlInput(ev.currentTarget.value)}
         />
         <button type="submit" class="rounded bg-rose-300 p-2 font-bold text-white">
@@ -166,7 +172,7 @@ const ToggleButton = (props: {
   );
 };
 
-const EmojiConfig = () => {
+const ReactionConfig = () => {
   const { config, setConfig } = useConfig();
 
   const toggleUseEmojiReaction = () => {
@@ -206,6 +212,68 @@ const EmojiConfig = () => {
   );
 };
 
+const EmojiConfig = () => {
+  const { config, saveEmoji, removeEmoji } = useConfig();
+
+  const [shortcodeInput, setShortcodeInput] = createSignal('');
+  const [urlInput, setUrlInput] = createSignal('');
+
+  const handleClickSaveEmoji: JSX.EventHandler<HTMLFormElement, SubmitEvent> = (ev) => {
+    ev.preventDefault();
+    if (shortcodeInput().length === 0 || urlInput().length === 0) return;
+    saveEmoji({ shortcode: shortcodeInput(), url: urlInput() });
+  };
+
+  return (
+    <div class="py-2">
+      <h3 class="font-bold">カスタム絵文字</h3>
+      <ul class="flex flex-col gap-1 py-2">
+        <For each={Object.values(config().customEmojis)}>
+          {({ shortcode, url }) => (
+            <li class="flex items-center gap-2">
+              <img class="h-7 max-w-[128px]" src={url} alt={shortcode} />
+              <div class="flex-1 truncate">{shortcode}</div>
+              <button class="h-3 w-3 shrink-0" onClick={() => removeEmoji(shortcode)}>
+                <XMark />
+              </button>
+            </li>
+          )}
+        </For>
+      </ul>
+      <form class="flex gap-2" onSubmit={handleClickSaveEmoji}>
+        <label class="flex flex-1 items-center gap-1">
+          <div>名前</div>
+          <input
+            class="flex-1 rounded-md focus:border-rose-100 focus:ring-rose-300"
+            type="text"
+            name="shortcode"
+            value={shortcodeInput()}
+            pattern="^[a-zA-Z0-9]+$"
+            required
+            onChange={(ev) => setShortcodeInput(ev.currentTarget.value)}
+          />
+        </label>
+        <label class="flex flex-1 items-center gap-1">
+          <div>URL</div>
+          <input
+            class="flex-1 rounded-md focus:border-rose-100 focus:ring-rose-300"
+            type="text"
+            name="url"
+            value={urlInput()}
+            placeholder="https://.../emoji.png"
+            pattern={HttpUrlRegex}
+            required
+            onChange={(ev) => setUrlInput(ev.currentTarget.value)}
+          />
+        </label>
+        <button type="submit" class="rounded bg-rose-300 p-2 font-bold text-white">
+          保存
+        </button>
+      </form>
+    </div>
+  );
+};
+
 const MuteConfig = () => {
   const { config, removeMutedPubkey, addMutedKeyword, removeMutedKeyword } = useConfig();
 
@@ -335,6 +403,7 @@ const ConfigUI = (props: ConfigProps) => {
         <ProfileSection />
         <RelayConfig />
         <DateFormatConfig />
+        <ReactionConfig />
         <EmojiConfig />
         <OtherConfig />
         <MuteConfig />
diff --git a/src/components/utils/Popup.tsx b/src/components/utils/Popup.tsx
index 9f93514..8010783 100644
--- a/src/components/utils/Popup.tsx
+++ b/src/components/utils/Popup.tsx
@@ -104,6 +104,7 @@ const Popup: Component<PopupProps> = (props) => {
   return (
     <div>
       <button
+        type="button"
         ref={buttonRef}
         class="flex items-center"
         onClick={() => {
diff --git a/src/core/useConfig.ts b/src/core/useConfig.ts
index b848777..3172761 100644
--- a/src/core/useConfig.ts
+++ b/src/core/useConfig.ts
@@ -1,6 +1,7 @@
 import { type Accessor, type Setter } from 'solid-js';
 
 import uniq from 'lodash/uniq';
+import uniqBy from 'lodash/uniqBy';
 import { Kind, type Event as NostrEvent } from 'nostr-tools';
 
 import {
@@ -18,9 +19,15 @@ import {
 } from '@/hooks/createSignalWithStorage';
 import eventWrapper from '@/nostr/event';
 
+export type CustomEmojiConfig = {
+  shortcode: string;
+  url: string;
+};
+
 export type Config = {
   relayUrls: string[];
   columns: ColumnType[];
+  customEmojis: Record<string, CustomEmojiConfig>;
   dateFormat: 'relative' | 'absolute-long' | 'absolute-short';
   keepOpenPostForm: boolean;
   useEmojiReaction: boolean;
@@ -37,19 +44,22 @@ type UseConfig = {
   // relay
   addRelay: (url: string) => void;
   removeRelay: (url: string) => void;
+  // column
+  saveColumn: (column: ColumnType) => void;
+  moveColumn: (columnId: string, index: number) => void;
+  removeColumn: (columnId: string) => void;
+  initializeColumns: (param: { pubkey: string }) => void;
+  // emoji
+  saveEmoji: (emoji: CustomEmojiConfig) => void;
+  removeEmoji: (shortcode: string) => void;
+  getEmoji: (shortcode: string) => CustomEmojiConfig | undefined;
   // mute
   addMutedPubkey: (pubkey: string) => void;
   removeMutedPubkey: (pubkey: string) => void;
   addMutedKeyword: (keyword: string) => void;
   removeMutedKeyword: (keyword: string) => void;
-  // column
-  saveColumn: (column: ColumnType) => void;
-  moveColumn: (columnId: string, index: number) => void;
-  removeColumn: (columnId: string) => void;
-  // functions
   isPubkeyMuted: (pubkey: string) => boolean;
   shouldMuteEvent: (event: NostrEvent) => boolean;
-  initializeColumns: (param: { pubkey: string }) => void;
 };
 
 const initialRelays = (): string[] => {
@@ -63,6 +73,7 @@ const initialRelays = (): string[] => {
 const InitialConfig = (): Config => ({
   relayUrls: initialRelays(),
   columns: [],
+  customEmojis: {},
   dateFormat: 'relative',
   keepOpenPostForm: false,
   useEmojiReaction: false,
@@ -141,6 +152,17 @@ const useConfig = (): UseConfig => {
     setConfig('columns', (current) => current.filter((e) => e.id !== columnId));
   };
 
+  const saveEmoji = (emoji: CustomEmojiConfig) => {
+    setConfig('customEmojis', (current) => ({ ...current, [emoji.shortcode]: emoji }));
+  };
+
+  const removeEmoji = (shortcode: string) => {
+    setConfig('customEmojis', (current) => ({ ...current, [shortcode]: undefined }));
+  };
+
+  const getEmoji = (shortcode: string): CustomEmojiConfig | undefined =>
+    config.customEmojis[shortcode];
+
   const isPubkeyMuted = (pubkey: string) => config.mutedPubkeys.includes(pubkey);
 
   const hasMutedKeyword = (event: NostrEvent) => {
@@ -180,18 +202,25 @@ const useConfig = (): UseConfig => {
   return {
     config: () => config,
     setConfig,
+    // relay
     addRelay,
     removeRelay,
+    // column
+    saveColumn,
+    moveColumn,
+    removeColumn,
+    initializeColumns,
+    // emoji
+    saveEmoji,
+    removeEmoji,
+    getEmoji,
+    // mute
     addMutedPubkey,
     removeMutedPubkey,
     addMutedKeyword,
     removeMutedKeyword,
-    saveColumn,
-    moveColumn,
-    removeColumn,
     isPubkeyMuted,
     shouldMuteEvent,
-    initializeColumns,
   };
 };
 
diff --git a/src/nostr/event.ts b/src/nostr/event.ts
index 3b2f529..e014c3b 100644
--- a/src/nostr/event.ts
+++ b/src/nostr/event.ts
@@ -47,20 +47,15 @@ const eventSchema = z.object({
 const EmojiTagSchema = z.tuple([
   z.literal('emoji'),
   z.string().regex(/^[a-zA-Z0-9]+$/, { message: 'shortcode should be alpahnumeric' }),
-  z.string().url().refine(isImageUrl),
+  z.string().url(), // .refine(isImageUrl)
 ]);
 
 export type EmojiTag = z.infer<typeof EmojiTagSchema>;
 
 const ensureSchema =
   <T>(schema: z.Schema<T>) =>
-  (value: any): value is T => {
-    const result = schema.safeParse(value);
-    if (!result.success) {
-      console.warn('failed to parse value', value, schema);
-    }
-    return result.success;
-  };
+  (value: any): value is T =>
+    schema.safeParse(value).success;
 
 const eventWrapper = (event: NostrEvent) => {
   let memoizedMarkedEventTags: MarkedEventTag[] | undefined;