diff --git a/packages/backend/migration/1680969937000-larger-image-comment.js b/packages/backend/migration/1680969937000-larger-image-comment.js
new file mode 100644
index 000000000..b6b4f9091
--- /dev/null
+++ b/packages/backend/migration/1680969937000-larger-image-comment.js
@@ -0,0 +1,12 @@
+export class largerImageComment1680969937000 {
+    name = 'largerImageComment1680969937000';
+
+    async up(queryRunner) {
+        await queryRunner.query(`ALTER TABLE "drive_file" ALTER COLUMN "comment" TYPE character varying(8192)`, undefined);
+    }
+
+    async down(queryRunner) {
+        await queryRunner.query(`ALTER TABLE "drive_file" ALTER COLUMN "comment" TYPE character varying(512)`, undefined);
+    }
+
+}
diff --git a/packages/backend/src/const.ts b/packages/backend/src/const.ts
index 716a8de38..6abc11ac9 100644
--- a/packages/backend/src/const.ts
+++ b/packages/backend/src/const.ts
@@ -21,7 +21,7 @@ export const DB_MAX_NOTE_TEXT_LENGTH = 8192;
  * Maximum image description length that can be stored in DB.
  * Surrogate pairs count as one
  */
-export const DB_MAX_IMAGE_COMMENT_LENGTH = 512;
+export const DB_MAX_IMAGE_COMMENT_LENGTH = 8192;
 //#endregion
 
 // ブラウザで直接表示することを許可するファイルの種類のリスト
diff --git a/packages/backend/src/models/DriveFile.ts b/packages/backend/src/models/DriveFile.ts
index c12f0e0f0..865b86f67 100644
--- a/packages/backend/src/models/DriveFile.ts
+++ b/packages/backend/src/models/DriveFile.ts
@@ -67,7 +67,8 @@ export class MiDriveFile {
 	public size: number;
 
 	@Column('varchar', {
-		length: 512, nullable: true,
+		length: 8192,
+		nullable: true,
 		comment: 'The comment of the DriveFile.',
 	})
 	public comment: string | null;
diff --git a/packages/backend/src/server/api/endpoints/drive/files/update.ts b/packages/backend/src/server/api/endpoints/drive/files/update.ts
index c01f3de03..c96e1a1aa 100644
--- a/packages/backend/src/server/api/endpoints/drive/files/update.ts
+++ b/packages/backend/src/server/api/endpoints/drive/files/update.ts
@@ -10,6 +10,7 @@ import { DI } from '@/di-symbols.js';
 import { RoleService } from '@/core/RoleService.js';
 import { DriveService } from '@/core/DriveService.js';
 import { ApiError } from '../../../error.js';
+import { DB_MAX_IMAGE_COMMENT_LENGTH } from '@/const.js';
 
 export const meta = {
 	tags: ['drive'],
@@ -65,7 +66,7 @@ export const paramDef = {
 		folderId: { type: 'string', format: 'misskey:id', nullable: true },
 		name: { type: 'string' },
 		isSensitive: { type: 'boolean' },
-		comment: { type: 'string', nullable: true, maxLength: 512 },
+		comment: { type: 'string', nullable: true, maxLength: DB_MAX_IMAGE_COMMENT_LENGTH },
 	},
 	required: ['fileId'],
 } as const;
diff --git a/packages/backend/src/server/api/endpoints/drive/files/upload-from-url.ts b/packages/backend/src/server/api/endpoints/drive/files/upload-from-url.ts
index bbe62063c..1e66035b5 100644
--- a/packages/backend/src/server/api/endpoints/drive/files/upload-from-url.ts
+++ b/packages/backend/src/server/api/endpoints/drive/files/upload-from-url.ts
@@ -9,6 +9,7 @@ import { Endpoint } from '@/server/api/endpoint-base.js';
 import { GlobalEventService } from '@/core/GlobalEventService.js';
 import { DriveFileEntityService } from '@/core/entities/DriveFileEntityService.js';
 import { DriveService } from '@/core/DriveService.js';
+import { DB_MAX_IMAGE_COMMENT_LENGTH } from '@/const.js';
 
 export const meta = {
 	tags: ['drive'],
@@ -33,7 +34,7 @@ export const paramDef = {
 		url: { type: 'string' },
 		folderId: { type: 'string', format: 'misskey:id', nullable: true, default: null },
 		isSensitive: { type: 'boolean', default: false },
-		comment: { type: 'string', nullable: true, maxLength: 512, default: null },
+		comment: { type: 'string', nullable: true, maxLength: DB_MAX_IMAGE_COMMENT_LENGTH, default: null },
 		marker: { type: 'string', nullable: true, default: null },
 		force: { type: 'boolean', default: false },
 	},