diff --git a/src/components/modal/Config.tsx b/src/components/modal/Config.tsx
index 9161ae2..0959fe5 100644
--- a/src/components/modal/Config.tsx
+++ b/src/components/modal/Config.tsx
@@ -16,7 +16,6 @@ import LazyLoad from '@/components/utils/LazyLoad';
 import usePopup from '@/components/utils/usePopup';
 import { colorThemes } from '@/core/colorThemes';
 import useConfig, { type Config } from '@/core/useConfig';
-import { useOldConfig } from '@/hooks/useInterWindow';
 import useModalState from '@/hooks/useModalState';
 import { useTranslation } from '@/i18n/useTranslation';
 import usePubkey from '@/nostr/usePubkey';
@@ -635,7 +634,6 @@ const OtherConfig = () => {
 const ConfigUI = (props: ConfigProps) => {
   const i18n = useTranslation();
   const [menuIndex, setMenuIndex] = createSignal<number | null>(null);
-  const { canImport, importConfig } = useOldConfig();
 
   const menu = [
     {
@@ -692,19 +690,6 @@ const ConfigUI = (props: ConfigProps) => {
           fallback={
             <>
               <h2 class="flex-1 text-center text-lg font-bold">{i18n()('config.config')}</h2>
-              <Show when={canImport()}>
-                <button
-                  type="button"
-                  class="rounded bg-primary p-2 text-primary-fg"
-                  onClick={() => {
-                    if (window.confirm(i18n()('config.confirmImportOldDomainConfig'))) {
-                      importConfig();
-                    }
-                  }}
-                >
-                  {i18n()('config.importOldDomainConfig')}
-                </button>
-              </Show>
               <ul class="flex flex-col">
                 <For each={menu}>
                   {(menuItem, i) => (
diff --git a/src/hooks/useInterWindow.tsx b/src/hooks/useInterWindow.tsx
deleted file mode 100644
index 921a3bd..0000000
--- a/src/hooks/useInterWindow.tsx
+++ /dev/null
@@ -1,123 +0,0 @@
-import { createSignal, onMount, onCleanup, observable } from 'solid-js';
-
-import useConfig from '@/core/useConfig';
-import {
-  type InterWindowRequest,
-  type InterWindowRequestWithId,
-  type InterWindowResponseWithId,
-} from '@/interWindow';
-
-const useInterWindow = (url: string) => {
-  let iframeRef: HTMLIFrameElement | undefined;
-  const [loaded, setLoaded] = createSignal(false);
-
-  onMount(() => {
-    iframeRef = (<iframe title="interwindow" class="hidden" src={url} />) as HTMLIFrameElement;
-    document.body.appendChild(iframeRef);
-    iframeRef.addEventListener('load', () => setLoaded(true));
-    onCleanup(() => {
-      iframeRef?.remove();
-    });
-  });
-
-  const waitLoaded = (): Promise<void> => {
-    if (loaded()) return Promise.resolve();
-    return new Promise((resolve) => {
-      observable(loaded).subscribe((v) => {
-        if (v) resolve();
-      });
-    });
-  };
-
-  const listen = async (
-    expectedRequestId: number,
-    timeout: number = 2000,
-  ): Promise<InterWindowResponseWithId> =>
-    new Promise((resolve, reject) => {
-      const listener = (event: MessageEvent) => {
-        console.log('message received', event);
-        if (event.origin !== new URL(url).origin) return;
-        if (typeof event.data !== 'string') return;
-
-        const data = JSON.parse(event.data) as InterWindowResponseWithId;
-
-        if (data.requestId !== expectedRequestId) return;
-
-        window.removeEventListener('message', listener);
-        resolve(data);
-      };
-
-      setTimeout(() => {
-        reject(new Error('timeout'));
-        window.removeEventListener('message', listener);
-      }, timeout);
-
-      window.addEventListener('message', listener, false);
-    });
-
-  const request = async (message: InterWindowRequest) => {
-    const requestId = Math.random();
-    const withId = { ...message, requestId } satisfies InterWindowRequestWithId;
-    const messageStr = JSON.stringify(withId);
-
-    await waitLoaded();
-    const promise = listen(requestId);
-    if (iframeRef == null) {
-      throw new Error('iframeRef is null');
-    }
-    if (!loaded()) {
-      throw new Error('iframeRef is not loaded');
-    }
-    iframeRef.contentWindow?.postMessage(messageStr, new URL(url).origin);
-    return promise;
-  };
-
-  const getConfig = () => request({ type: 'GET_CONFIG' });
-
-  return {
-    loaded,
-    request,
-    getConfig,
-  };
-};
-
-export const useOldConfig = () => {
-  const url = 'https://syusui-s.github.io/rabbit/transfer-config.html';
-  const { getConfig } = useInterWindow(url);
-  const { setConfig } = useConfig();
-
-  const [oldConfig, setOldConfig] = createSignal<string | undefined>();
-
-  const canImport = () => {
-    const c = oldConfig();
-    return c != null && c.length > 0;
-  };
-
-  const importConfig = () => {
-    const c = oldConfig();
-    if (c != null && c.length > 0) {
-      setConfig(JSON.parse(c));
-    }
-  };
-
-  onMount(() => {
-    setTimeout(() => {
-      getConfig()
-        .then((obtainedConfig) => {
-          if (typeof obtainedConfig.payload === 'string' && obtainedConfig.payload.length > 0) {
-            setOldConfig(obtainedConfig.payload);
-          }
-        })
-        .catch((err) => {
-          console.error(err);
-        });
-    }, 100);
-  });
-
-  return {
-    canImport,
-    importConfig,
-  };
-};
-
-export default useInterWindow;
diff --git a/src/interWindow.ts b/src/interWindow.ts
deleted file mode 100644
index e010dba..0000000
--- a/src/interWindow.ts
+++ /dev/null
@@ -1,38 +0,0 @@
-export type InterWindowRequest = {
-  type: 'GET_CONFIG';
-};
-
-export type InterWindowRequestWithId = InterWindowRequest & {
-  requestId: number;
-};
-
-export type InterWindowResponse = {
-  type: 'OK' | 'BAD_REQUEST' | 'NOT_FOUND' | 'INTERNAL_PEER_ERROR';
-  payload?: string;
-};
-
-export type InterWindowResponseWithId = InterWindowResponse & {
-  requestId: number;
-};
-
-export type RequestHandler = (request: InterWindowRequestWithId) => InterWindowResponse;
-
-export const ok = (payload?: string): InterWindowResponse => ({
-  type: 'OK',
-  payload,
-});
-
-export const badRequest = (payload?: string): InterWindowResponse => ({
-  type: 'BAD_REQUEST',
-  payload,
-});
-
-export const notFound = (payload?: string): InterWindowResponse => ({
-  type: 'NOT_FOUND',
-  payload,
-});
-
-export const internalPeerError = (payload?: string): InterWindowResponse => ({
-  type: 'INTERNAL_PEER_ERROR',
-  payload,
-});
diff --git a/src/locales/en.ts b/src/locales/en.ts
index 3b880cc..b6b3417 100644
--- a/src/locales/en.ts
+++ b/src/locales/en.ts
@@ -125,8 +125,6 @@ export default {
   },
   config: {
     config: 'Settings',
-    importOldDomainConfig: 'Import config from the old domain',
-    confirmImportOldDomainConfig: 'Import? (The config will be overwritten)',
     profile: {
       profile: 'Profile',
       openProfile: 'Open',
diff --git a/src/locales/ja.ts b/src/locales/ja.ts
index e2c4651..dcf2775 100644
--- a/src/locales/ja.ts
+++ b/src/locales/ja.ts
@@ -121,8 +121,6 @@ export default {
   },
   config: {
     config: '設定',
-    importOldDomainConfig: '古いドメインから設定をインポート',
-    confirmImportOldDomainConfig: 'インポートしますか？（現在の設定は上書きされます）',
     profile: {
       profile: 'プロフィール',
       openProfile: '開く',
diff --git a/src/pages/Hello.tsx b/src/pages/Hello.tsx
index 7b81671..1fd1b65 100644
--- a/src/pages/Hello.tsx
+++ b/src/pages/Hello.tsx
@@ -2,8 +2,6 @@ import { createSignal, onMount, Switch, Match, type Component } from 'solid-js';
 
 import { useNavigate } from '@solidjs/router';
 
-import useConfig from '@/core/useConfig';
-import { useOldConfig } from '@/hooks/useInterWindow';
 import usePersistStatus from '@/hooks/usePersistStatus';
 import { useTranslation } from '@/i18n/useTranslation';
 import resolveAsset from '@/utils/resolveAsset';
@@ -38,24 +36,13 @@ const Hello: Component = () => {
   const signerStatus = useSignerStatus();
   const navigate = useNavigate();
   const { persistStatus, loggedIn } = usePersistStatus();
-  const { config } = useConfig();
-  const { canImport, importConfig } = useOldConfig();
 
   const handleLogin = () => {
-    if (
-      config().columns.length === 0 &&
-      canImport() &&
-      window.confirm('import config from old domain?')
-    ) {
-      importConfig();
-    }
-
     loggedIn();
     navigate('/');
   };
 
   onMount(() => {
-    console.log();
     if (persistStatus().loggedIn) {
       navigate('/');
     }
diff --git a/transfer-config.html b/transfer-config.html
deleted file mode 100644
index 51ec159..0000000
--- a/transfer-config.html
+++ /dev/null
@@ -1,9 +0,0 @@
-<!DOCTYPE html>
-<html>
-  <head>
-    <meta charset="utf-8">
-    <title>Transfer Config</title>
-    <script src="transfer-config.ts" type="module"></script>
-  </head>
-  <body></body>
-</html>
diff --git a/transfer-config.ts b/transfer-config.ts
deleted file mode 100644
index a89cecf..0000000
--- a/transfer-config.ts
+++ /dev/null
@@ -1,53 +0,0 @@
-import {
-  ok,
-  notFound,
-  internalPeerError,
-  type InterWindowRequestWithId,
-  type RequestHandler,
-} from '@/interWindow';
-
-(() => {
-  const acceptableOrigins = [
-    window.location.origin,
-    'http://localhost:3000',
-    'http://localhost:12345',
-    'https://rabbit.syusui.net',
-  ];
-
-  const rawMessageHandler = (handler: RequestHandler) => (event: MessageEvent) => {
-    console.log('transfer-config: received request', event.data, event.origin);
-    if (!acceptableOrigins.includes(event.origin)) return;
-
-    const { origin, source } = event;
-    if (typeof event.data !== 'string') return;
-    const request = JSON.parse(event.data) as InterWindowRequestWithId;
-
-    let responseObj;
-    try {
-      responseObj = handler(request);
-    } catch (e) {
-      responseObj = internalPeerError(undefined);
-    }
-
-    const response = JSON.stringify({ requestId: request.requestId, ...responseObj });
-    // @ts-expect-error postMessage
-    source?.postMessage(response, origin);
-  };
-
-  window.addEventListener(
-    'message',
-    rawMessageHandler((request) => {
-      switch (request.type) {
-        case 'GET_CONFIG': {
-          const value = window.localStorage.getItem('RabbitConfig') ?? '';
-          return ok(value);
-        }
-        default:
-          return notFound();
-      }
-    }),
-    false,
-  );
-
-  console.log('transfer-config: mounted');
-})();
diff --git a/vite.config.ts b/vite.config.ts
index bd8175b..4ae4876 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -14,12 +14,6 @@ export default defineConfig({
   build: {
     target: 'esnext',
     sourcemap: true,
-    rollupOptions: {
-      input: {
-        main: './index.html',
-        transferConfig: './transfer-config.html',
-      },
-    },
   },
   resolve: {
     alias: {