diff --git a/packages/frontend/src/scripts/note-drafts.ts b/packages/frontend/src/scripts/note-drafts.ts
new file mode 100644
index 0000000000..0b886f912c
--- /dev/null
+++ b/packages/frontend/src/scripts/note-drafts.ts
@@ -0,0 +1,44 @@
+import * as Misskey from 'misskey-js';
+import type { PollEditorModelValue } from '@/components/MkPollEditor.vue';
+import type { DeleteScheduleEditorModelValue } from '@/components/MkDeleteScheduleEditor.vue';
+import { miLocalStorage } from '@/local-storage.js';
+
+export type NoteDraft = {
+	updatedAt: Date;
+	data: {
+		text: string;
+		useCw: boolean;
+		cw: string | null;
+		visibility: (typeof Misskey.noteVisibilities)[number];
+		localOnly: boolean;
+		files: Misskey.entities.DriveFile[];
+		poll: PollEditorModelValue | null;
+		scheduledNoteDelete: DeleteScheduleEditorModelValue | null;
+	};
+};
+
+export function getAll() {
+	const drafts = miLocalStorage.getItem('drafts');
+	if (!drafts) return {};
+	return JSON.parse(drafts) as Record<string, NoteDraft | undefined>;
+}
+
+export function get(key: string) {
+	const draft = getAll()[key];
+	return draft ?? null;
+}
+
+export function set(key: string, draft: NoteDraft['data']) {
+	const drafts = getAll();
+	drafts[key] = {
+		updatedAt: new Date(),
+		data: draft,
+	};
+	miLocalStorage.setItem('drafts', JSON.stringify(drafts));
+}
+
+export function remove(key: string) {
+	const drafts = getAll();
+	delete drafts[key];
+	miLocalStorage.setItem('drafts', JSON.stringify(drafts));
+}