diff --git a/packages/backend/src/queue/index.ts b/packages/backend/src/queue/index.ts
index d5b42d637f..1327853d04 100644
--- a/packages/backend/src/queue/index.ts
+++ b/packages/backend/src/queue/index.ts
@@ -317,12 +317,14 @@ export function createImportFollowingJob(
 export function createImportPostsJob(
 	user: ThinUser,
 	fileId: DriveFile["id"],
+	signatureCheck: boolean,
 ) {
 	return dbQueue.add(
 		"importPosts",
 		{
 			user: user,
 			fileId: fileId,
+			signatureCheck: signatureCheck,
 		},
 		{
 			removeOnComplete: true,
diff --git a/packages/backend/src/queue/processors/db/import-posts.ts b/packages/backend/src/queue/processors/db/import-posts.ts
index 3bfb3acca2..cbeb333359 100644
--- a/packages/backend/src/queue/processors/db/import-posts.ts
+++ b/packages/backend/src/queue/processors/db/import-posts.ts
@@ -5,7 +5,7 @@ import * as Post from "@/misc/post.js";
 import create from "@/services/note/create.js";
 import { downloadTextFile } from "@/misc/download-text-file.js";
 import { Users, DriveFiles } from "@/models/index.js";
-import type { DbUserImportJobData } from "@/queue/types.js";
+import type { DbUserImportPostsJobData } from "@/queue/types.js";
 import { queueLogger } from "../../logger.js";
 import type Bull from "bull";
 import { htmlToMfm } from "@/remote/activitypub/misc/html-to-mfm.js";
@@ -13,7 +13,7 @@ import { htmlToMfm } from "@/remote/activitypub/misc/html-to-mfm.js";
 const logger = queueLogger.createSubLogger("import-posts");
 
 export async function importPosts(
-	job: Bull.Job<DbUserImportJobData>,
+	job: Bull.Job<DbUserImportPostsJobData>,
 	done: any,
 ): Promise<void> {
 	logger.info(`Importing posts of ${job.data.user.id} ...`);
diff --git a/packages/backend/src/queue/types.ts b/packages/backend/src/queue/types.ts
index 90e88f7366..e31619ff27 100644
--- a/packages/backend/src/queue/types.ts
+++ b/packages/backend/src/queue/types.ts
@@ -21,6 +21,7 @@ export type InboxJobData = {
 
 export type DbJobData =
 	| DbUserJobData
+	| DbUserImportPostsJobData
 	| DbUserImportJobData
 	| DbUserDeleteJobData;
 
@@ -40,6 +41,12 @@ export type DbUserImportJobData = {
 	fileId: DriveFile["id"];
 };
 
+export type DbUserImportPostsJobData = {
+	user: ThinUser;
+	fileId: DriveFile["id"];
+	signatureCheck: boolean;
+};
+
 export type ObjectStorageJobData =
 	| ObjectStorageFileJobData
 	| Record<string, unknown>;
diff --git a/packages/backend/src/server/api/endpoints/i/import-posts.ts b/packages/backend/src/server/api/endpoints/i/import-posts.ts
index 254e37d8a4..6fdf562fdb 100644
--- a/packages/backend/src/server/api/endpoints/i/import-posts.ts
+++ b/packages/backend/src/server/api/endpoints/i/import-posts.ts
@@ -30,6 +30,7 @@ export const paramDef = {
 	type: "object",
 	properties: {
 		fileId: { type: "string", format: "misskey:id" },
+		signatureCheck: { type: "boolean" },
 	},
 	required: ["fileId"],
 } as const;
@@ -39,5 +40,5 @@ export default define(meta, paramDef, async (ps, user) => {
 
 	if (file == null) throw new ApiError(meta.errors.noSuchFile);
 	if (file.size === 0) throw new ApiError(meta.errors.emptyFile);
-	createImportPostsJob(user, file.id);
+	createImportPostsJob(user, file.id, ps.signatureCheck);
 });
diff --git a/packages/client/src/pages/settings/import-export.vue b/packages/client/src/pages/settings/import-export.vue
index 4822ccff06..4222c6fa0b 100644
--- a/packages/client/src/pages/settings/import-export.vue
+++ b/packages/client/src/pages/settings/import-export.vue
@@ -10,6 +10,9 @@
 		<FormFolder class="_formBlock">
 			<template #label>{{ i18n.ts.import }}</template>
 			<template #icon><i class="ph-upload-simple ph-bold ph-lg"></i></template>
+			<FormSwitch v-model="signatureCheck" class="_formBlock">
+				Mastodon import?
+			</FormSwitch>
 			<MkButton primary :class="$style.button" inline @click="importPosts($event)"><i class="ph-upload-simple ph-bold ph-lg"></i> {{ i18n.ts.import }}</MkButton>
 		</FormFolder>
 	</FormSection>
@@ -86,6 +89,7 @@ import { i18n } from '@/i18n';
 import { definePageMetadata } from '@/scripts/page-metadata';
 
 const excludeMutingUsers = ref(false);
+const signatureCheck = ref(false);
 const excludeInactiveUsers = ref(false);
 
 const onExportSuccess = () => {
@@ -115,7 +119,7 @@ const exportNotes = () => {
 
 const importPosts = async (ev) => {
 	const file = await selectFile(ev.currentTarget ?? ev.target);
-	os.api('i/import-posts', { fileId: file.id }).then(onImportSuccess).catch(onError);
+	os.api('i/import-posts', { fileId: file.id, signatureCheck: signatureCheck }).then(onImportSuccess).catch(onError);
 };
 
 const exportFollowing = () => {