diff --git a/src/hooks/auth/useMigration.ts b/src/hooks/auth/useMigration.ts
new file mode 100644
index 00000000..bfe9bbf1
--- /dev/null
+++ b/src/hooks/auth/useMigration.ts
@@ -0,0 +1,125 @@
+import { useCallback } from "react";
+
+import { SessionResponse } from "@/backend/accounts/auth";
+import { bookmarkMediaToInput } from "@/backend/accounts/bookmarks";
+import {
+  base64ToBuffer,
+  bytesToBase64,
+  bytesToBase64Url,
+  encryptData,
+  keysFromMnemonic,
+  keysFromSeed,
+  signChallenge,
+} from "@/backend/accounts/crypto";
+import { importBookmarks, importProgress } from "@/backend/accounts/import";
+import { getLoginChallengeToken, loginAccount } from "@/backend/accounts/login";
+import { progressMediaItemToInputs } from "@/backend/accounts/progress";
+import {
+  getRegisterChallengeToken,
+  registerAccount,
+} from "@/backend/accounts/register";
+import { removeSession } from "@/backend/accounts/sessions";
+import { getSettings } from "@/backend/accounts/settings";
+import {
+  UserResponse,
+  getBookmarks,
+  getProgress,
+  getUser,
+} from "@/backend/accounts/user";
+import { useAuthData } from "@/hooks/auth/useAuthData";
+import { useBackendUrl } from "@/hooks/auth/useBackendUrl";
+import { AccountWithToken, useAuthStore } from "@/stores/auth";
+import { BookmarkMediaItem, useBookmarkStore } from "@/stores/bookmarks";
+import { ProgressMediaItem, useProgressStore } from "@/stores/progress";
+
+export interface RegistrationData {
+  recaptchaToken?: string;
+  mnemonic: string;
+  userData: {
+    device: string;
+    profile: {
+      colorA: string;
+      colorB: string;
+      icon: string;
+    };
+  };
+}
+
+export interface LoginData {
+  mnemonic: string;
+  userData: {
+    device: string;
+  };
+}
+
+export function useMigration() {
+  const currentAccount = useAuthStore((s) => s.account);
+  const progress = useProgressStore((s) => s.items);
+  const bookmarks = useBookmarkStore((s) => s.bookmarks);
+  const { login: userDataLogin } = useAuthData();
+
+  const importData = async (
+    backendUrl: string,
+    account: AccountWithToken,
+    progressItems: Record<string, ProgressMediaItem>,
+    bookmarkItems: Record<string, BookmarkMediaItem>,
+  ) => {
+    if (
+      Object.keys(progressItems).length === 0 &&
+      Object.keys(bookmarkItems).length === 0
+    ) {
+      return;
+    }
+
+    const progressInputs = Object.entries(progressItems).flatMap(
+      ([tmdbId, item]) => progressMediaItemToInputs(tmdbId, item),
+    );
+
+    const bookmarkInputs = Object.entries(bookmarkItems).map(([tmdbId, item]) =>
+      bookmarkMediaToInput(tmdbId, item),
+    );
+
+    await Promise.all([
+      importProgress(backendUrl, account, progressInputs),
+      importBookmarks(backendUrl, account, bookmarkInputs),
+    ]);
+  };
+
+  const migrate = useCallback(
+    async (backendUrl: string, recaptchaToken: string) => {
+      if (!currentAccount) return;
+
+      const { challenge } = await getRegisterChallengeToken(
+        backendUrl,
+        recaptchaToken,
+      );
+      const keys = await keysFromSeed(base64ToBuffer(currentAccount.seed));
+      const signature = await signChallenge(keys, challenge);
+      const registerResult = await registerAccount(backendUrl, {
+        challenge: {
+          code: challenge,
+          signature,
+        },
+        publicKey: bytesToBase64Url(keys.publicKey),
+        device: await encryptData(currentAccount.deviceName, keys.seed),
+        profile: currentAccount.profile,
+      });
+
+      const account = await userDataLogin(
+        registerResult,
+        registerResult.user,
+        registerResult.session,
+        bytesToBase64(keys.seed),
+      );
+
+      await importData(backendUrl, account, progress, bookmarks);
+
+      return account;
+    },
+    [currentAccount, userDataLogin, bookmarks, progress],
+  );
+
+  return {
+    migrate,
+  };
+}