diff --git a/locales/index.d.ts b/locales/index.d.ts
index 0ae188f1f7..beccac4a1d 100644
--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@@ -1902,6 +1902,18 @@ export interface Locale extends ILocale {
      * 既定アップロード先
      */
     "uploadFolder": string;
+    /**
+     * ウォーターマーク
+     */
+    "watermark": string;
+    /**
+     * ウォーターマークをつける
+     */
+    "useWatermark": string;
+    /**
+     * 画像にウォーターマークを追加します
+     */
+    "useWatermarkDescription": string;
     /**
      * すべての通知を既読にする
      */
@@ -3143,13 +3155,25 @@ export interface Locale extends ILocale {
      */
     "duplicate": string;
     /**
-     * 左
+     * 上
      */
-    "left": string;
+    "top": string;
+    /**
+     * 下
+     */
+    "bottom": string;
     /**
      * 中央
      */
     "center": string;
+    /**
+     * 左
+     */
+    "left": string;
+    /**
+     * 右
+     */
+    "right": string;
     /**
      * 広い
      */
@@ -4458,18 +4482,38 @@ export interface Locale extends ILocale {
      * 通知の表示
      */
     "notificationDisplay": string;
+    /**
+     * 配置
+     */
+    "placement": string;
     /**
      * 左上
      */
     "leftTop": string;
+    /**
+     * 中上
+     */
+    "centerTop": string;
     /**
      * 右上
      */
     "rightTop": string;
+    /**
+     * 左中
+     */
+    "leftCenter": string;
+    /**
+     * 右中
+     */
+    "rightCenter": string;
     /**
      * 左下
      */
     "leftBottom": string;
+    /**
+     * 中下
+     */
+    "centerBottom": string;
     /**
      * 右下
      */
@@ -4490,6 +4534,22 @@ export interface Locale extends ILocale {
      * 位置
      */
     "position": string;
+    /**
+     * 繰り返し
+     */
+    "repeat": string;
+    /**
+     * 引き伸ばし
+     */
+    "enlargement": string;
+    /**
+     * 回転
+     */
+    "rotate": string;
+    /**
+     * 透明度
+     */
+    "opacity": string;
     /**
      * サーバールール
      */
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 1b59708d85..01fdd36abe 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -471,6 +471,9 @@ share: "共有"
 notFound: "見つかりません"
 notFoundDescription: "指定されたURLに該当するページはありませんでした。"
 uploadFolder: "既定アップロード先"
+watermark: "ウォーターマーク"
+useWatermark: "ウォーターマークをつける"
+useWatermarkDescription: "画像にウォーターマークを追加します"
 markAsReadAllNotifications: "すべての通知を既読にする"
 markAsReadAllUnreadNotes: "すべての投稿を既読にする"
 markAsReadAllTalkMessages: "すべてのチャットを既読にする"
@@ -781,8 +784,11 @@ makeExplorable: "アカウントを見つけやすくする"
 makeExplorableDescription: "オフにすると、「みつける」にアカウントが載らなくなります。"
 showGapBetweenNotesInTimeline: "タイムラインのノートを離して表示"
 duplicate: "複製"
-left: "左"
+top: "上"
+bottom: "下"
 center: "中央"
+left: "左"
+right: "右"
 wide: "広い"
 narrow: "狭い"
 reloadToApplySetting: "設定はページリロード後に反映されます。"
@@ -1110,14 +1116,23 @@ editMemo: "メモを編集"
 reactionsList: "リアクション一覧"
 renotesList: "リノート一覧"
 notificationDisplay: "通知の表示"
+placement: "配置"
 leftTop: "左上"
+centerTop: "中上"
 rightTop: "右上"
+leftCenter: "左中"
+rightCenter: "右中"
 leftBottom: "左下"
+centerBottom: "中下"
 rightBottom: "右下"
 stackAxis: "スタック方向"
 vertical: "縦"
 horizontal: "横"
 position: "位置"
+repeat: "繰り返し"
+enlargement: "引き伸ばし"
+rotate: "回転"
+opacity: "透明度"
 serverRules: "サーバールール"
 pleaseConfirmBelowBeforeSignup: "このサーバーに登録するには、以下の内容を確認し同意する必要があります。"
 pleaseAgreeAllToContinue: "続けるには、全ての「同意する」にチェックが入っている必要があります。"
diff --git a/packages/frontend-shared/js/const.ts b/packages/frontend-shared/js/const.ts
index 4fe5cbb205..7253bc180c 100644
--- a/packages/frontend-shared/js/const.ts
+++ b/packages/frontend-shared/js/const.ts
@@ -86,6 +86,7 @@ export const ROLE_POLICIES = [
 	'canManageCustomEmojis',
 	'canManageAvatarDecorations',
 	'canSearchNotes',
+	'canUseReaction',
 	'canUseTranslator',
 	'canHideAds',
 	'driveCapacityMb',
diff --git a/packages/frontend/assets/default-watermark.png b/packages/frontend/assets/default-watermark.png
new file mode 100644
index 0000000000..e8edd64f69
Binary files /dev/null and b/packages/frontend/assets/default-watermark.png differ
diff --git a/packages/frontend/src/components/MkDrive.vue b/packages/frontend/src/components/MkDrive.vue
index 8be6d6f53d..fe44c33c6b 100644
--- a/packages/frontend/src/components/MkDrive.vue
+++ b/packages/frontend/src/components/MkDrive.vue
@@ -106,6 +106,7 @@ import XFile from '@/components/MkDrive.file.vue';
 import * as os from '@/os.js';
 import { misskeyApi } from '@/scripts/misskey-api.js';
 import { useStream } from '@/stream.js';
+import { $i } from '@/account.js';
 import { defaultStore } from '@/store.js';
 import { i18n } from '@/i18n.js';
 import { uploadFile, uploads } from '@/scripts/upload.js';
@@ -143,6 +144,7 @@ const selectedFolders = ref<Misskey.entities.DriveFolder[]>([]);
 const uploadings = uploads;
 const connection = useStream().useChannel('drive');
 const keepOriginal = ref<boolean>(defaultStore.state.keepOriginalUploading); // 外部渡しが多いので$refは使わないほうがよい
+const useWatermark = ref<boolean>(defaultStore.state.useWatermark);
 
 // ドロップされようとしているか
 const draghover = ref(false);
@@ -391,7 +393,7 @@ function onChangeFileInput() {
 }
 
 function upload(file: File, folderToUpload?: Misskey.entities.DriveFolder | null) {
-	uploadFile(file, (folderToUpload && typeof folderToUpload === 'object') ? folderToUpload.id : null, undefined, keepOriginal.value).then(res => {
+	uploadFile(file, (folderToUpload && typeof folderToUpload === 'object') ? folderToUpload.id : null, undefined, keepOriginal.value, useWatermark.value).then(res => {
 		addFile(res, true);
 	});
 }
@@ -633,7 +635,12 @@ function getMenu() {
 		type: 'switch',
 		text: i18n.ts.keepOriginalUploading,
 		ref: keepOriginal,
-	}, { type: 'divider' }, {
+	}, ...($i?.policies.canUseWatermark ? [{
+			type: 'switch',
+			text: i18n.ts.useWatermark,
+			ref: useWatermark,
+		}] as MenuItem[] : []
+	), { type: 'divider' }, {
 		text: i18n.ts.addFile,
 		type: 'label',
 	}, {
diff --git a/packages/frontend/src/pages/admin/roles.vue b/packages/frontend/src/pages/admin/roles.vue
index b1cbdad137..cc1546e0ef 100644
--- a/packages/frontend/src/pages/admin/roles.vue
+++ b/packages/frontend/src/pages/admin/roles.vue
@@ -89,14 +89,6 @@ SPDX-License-Identifier: AGPL-3.0-only
 							</MkInput>
 						</MkFolder>
 
-						<MkFolder v-if="matchQuery([i18n.ts._role._options.canManageAvatarDecorations, 'canManageAvatarDecorations'])">
-							<template #label>{{ i18n.ts._role._options.canManageAvatarDecorations }}</template>
-							<template #suffix>{{ policies.canManageAvatarDecorations ? i18n.ts.yes : i18n.ts.no }}</template>
-							<MkSwitch v-model="policies.canManageAvatarDecorations">
-								<template #label>{{ i18n.ts.enable }}</template>
-							</MkSwitch>
-						</MkFolder>
-
 						<MkFolder v-if="matchQuery([i18n.ts._role._options.canManageCustomEmojis, 'canManageCustomEmojis'])">
 							<template #label>{{ i18n.ts._role._options.canManageCustomEmojis }}</template>
 							<template #suffix>{{ policies.canManageCustomEmojis ? i18n.ts.yes : i18n.ts.no }}</template>
@@ -105,6 +97,14 @@ SPDX-License-Identifier: AGPL-3.0-only
 							</MkSwitch>
 						</MkFolder>
 
+						<MkFolder v-if="matchQuery([i18n.ts._role._options.canManageAvatarDecorations, 'canManageAvatarDecorations'])">
+							<template #label>{{ i18n.ts._role._options.canManageAvatarDecorations }}</template>
+							<template #suffix>{{ policies.canManageAvatarDecorations ? i18n.ts.yes : i18n.ts.no }}</template>
+							<MkSwitch v-model="policies.canManageAvatarDecorations">
+								<template #label>{{ i18n.ts.enable }}</template>
+							</MkSwitch>
+						</MkFolder>
+
 						<MkFolder v-if="matchQuery([i18n.ts._role._options.canSearchNotes, 'canSearchNotes'])">
 							<template #label>{{ i18n.ts._role._options.canSearchNotes }}</template>
 							<template #suffix>{{ policies.canSearchNotes ? i18n.ts.yes : i18n.ts.no }}</template>
diff --git a/packages/frontend/src/pages/settings/drive.vue b/packages/frontend/src/pages/settings/drive.vue
index 0e66b93f1c..1eeb14b854 100644
--- a/packages/frontend/src/pages/settings/drive.vue
+++ b/packages/frontend/src/pages/settings/drive.vue
@@ -33,11 +33,36 @@ SPDX-License-Identifier: AGPL-3.0-only
 	<FormSection>
 		<div class="_gaps_m">
 			<FormLink @click="chooseUploadFolder()">
+				<template #icon><i class="ti ti-folder"/></template>
 				{{ i18n.ts.uploadFolder }}
 				<template #suffix>{{ uploadFolder ? uploadFolder.name : '-' }}</template>
-				<template #suffixIcon><i class="ti ti-folder"></i></template>
 			</FormLink>
+			<MkFolder v-if="$i?.policies.canUseWatermark">
+				<template #icon><i class="ti ti-ripple"></i></template>
+				<template #label>{{ i18n.ts.watermark }}</template>
+				<div class="_gaps_s">
+					<MkSwitch v-model="useWatermark">
+						<template #label>{{ i18n.ts.useWatermark }}</template>
+						<template #caption>{{ i18n.ts.useWatermarkDescription }}</template>
+					</MkSwitch>
+					<FormSection>
+						<template #label>{{ i18n.ts.preview }}</template>
+						<div style="display: flex; justify-content: center; align-items: center;">
+							<div style="width: 80%; height: 400px; border: 1px solid #ccc; background-image: url('/client-assets/tutorial/natto_failed.webp'); background-size: cover;">
+								<img src="/client-assets/default-watermark.png" style="width: 100%; height: 100%; object-fit: contain; opacity: 0.5;"/>
+							</div>
+						</div>
+						<FormSplit>
+							<div class="_buttons">
+								<MkButton primary rounded><i class="ti ti-photo"/>{{ i18n.ts.selectFile }}</MkButton>
+								<MkButton danger rounded><i class="ti ti-trash"></i> {{ i18n.ts.defa }}</MkButton>
+							</div>
+						</FormSplit>
+					</FormSection>
+				</div>
+			</MkFolder>
 			<FormLink to="/settings/drive/cleaner">
+				<template #icon><i class="ti ti-file-shredder"/></template>
 				{{ i18n.ts.drivecleaner }}
 			</FormLink>
 			<MkSwitch v-model="keepOriginalUploading">
@@ -77,6 +102,9 @@ import MkChart from '@/components/MkChart.vue';
 import { i18n } from '@/i18n.js';
 import { definePageMetadata } from '@/scripts/page-metadata.js';
 import { signinRequired } from '@/account.js';
+import MkInfo from "@/components/MkInfo.vue";
+import MkButton from "@/components/MkButton.vue";
+import MkFolder from "@/components/MkFolder.vue";
 
 const $i = signinRequired();
 
@@ -102,6 +130,9 @@ const meterStyle = computed(() => {
 const keepOriginalUploading = computed(defaultStore.makeGetterSetter('keepOriginalUploading'));
 const keepOriginalFilename = computed(defaultStore.makeGetterSetter('keepOriginalFilename'));
 
+const useWatermark = computed(defaultStore.makeGetterSetter('useWatermark'));
+const watermarkConfig = computed(defaultStore.makeGetterSetter('watermarkConfig'));
+
 misskeyApi('drive').then(info => {
 	capacity.value = info.capacity;
 	usage.value = info.usage;
diff --git a/packages/frontend/src/scripts/select-file.ts b/packages/frontend/src/scripts/select-file.ts
index b037aa8acc..d0d874d428 100644
--- a/packages/frontend/src/scripts/select-file.ts
+++ b/packages/frontend/src/scripts/select-file.ts
@@ -9,17 +9,19 @@ import * as os from '@/os.js';
 import { misskeyApi } from '@/scripts/misskey-api.js';
 import { useStream } from '@/stream.js';
 import { i18n } from '@/i18n.js';
+import { $i } from '@/account.js';
 import { defaultStore } from '@/store.js';
 import { uploadFile } from '@/scripts/upload.js';
+import type { MenuItem } from '@/types/menu.js';
 
-export function chooseFileFromPc(multiple: boolean, keepOriginal = false): Promise<Misskey.entities.DriveFile[]> {
+export function chooseFileFromPc(multiple: boolean, keepOriginal = false, useWatermark = false): Promise<Misskey.entities.DriveFile[]> {
 	return new Promise((res, rej) => {
 		const input = document.createElement('input');
 		input.type = 'file';
 		input.multiple = multiple;
 		input.onchange = () => {
 			if (!input.files) return res([]);
-			const promises = Array.from(input.files, file => uploadFile(file, defaultStore.state.uploadFolder, undefined, keepOriginal));
+			const promises = Array.from(input.files, file => uploadFile(file, defaultStore.state.uploadFolder, undefined, keepOriginal, useWatermark));
 
 			Promise.all(promises).then(driveFiles => {
 				res(driveFiles);
@@ -83,6 +85,7 @@ export function chooseFileFromUrl(): Promise<Misskey.entities.DriveFile> {
 function select(src: HTMLElement | EventTarget | null, label: string | null, multiple: boolean): Promise<Misskey.entities.DriveFile[]> {
 	return new Promise((res, rej) => {
 		const keepOriginal = ref(defaultStore.state.keepOriginalUploading);
+		const useWatermark = ref(defaultStore.state.useWatermark);
 
 		os.popupMenu([label ? {
 			text: label,
@@ -91,10 +94,15 @@ function select(src: HTMLElement | EventTarget | null, label: string | null, mul
 			type: 'switch',
 			text: i18n.ts.keepOriginalUploading,
 			ref: keepOriginal,
-		}, {
+		}, ...($i?.policies.canUseWatermark ? [{
+				type: 'switch',
+				text: i18n.ts.useWatermark,
+				ref: useWatermark,
+			}] as MenuItem[] : []
+		), {
 			text: i18n.ts.upload,
 			icon: 'ti ti-upload',
-			action: () => chooseFileFromPc(multiple, keepOriginal.value).then(files => res(files)),
+			action: () => chooseFileFromPc(multiple, keepOriginal.value, useWatermark.value).then(files => res(files)),
 		}, {
 			text: i18n.ts.fromDrive,
 			icon: 'ti ti-cloud',
diff --git a/packages/frontend/src/scripts/upload.ts b/packages/frontend/src/scripts/upload.ts
index 713573a377..e9991ba69c 100644
--- a/packages/frontend/src/scripts/upload.ts
+++ b/packages/frontend/src/scripts/upload.ts
@@ -35,6 +35,7 @@ export function uploadFile(
 	folder?: string | Misskey.entities.DriveFolder,
 	name?: string,
 	keepOriginal: boolean = defaultStore.state.keepOriginalUploading,
+	watermark: boolean = defaultStore.state.useWatermark,
 ): Promise<Misskey.entities.DriveFile> {
 	if ($i == null) throw new Error('Not logged in');
 
diff --git a/packages/frontend/src/store.ts b/packages/frontend/src/store.ts
index 1d981e897b..3b2ac3b61d 100644
--- a/packages/frontend/src/store.ts
+++ b/packages/frontend/src/store.ts
@@ -474,6 +474,30 @@ export const defaultStore = markRaw(new Storage('base', {
 		where: 'device',
 		default: true,
 	},
+	useWatermark: {
+		where: 'device',
+		default: false,
+	},
+	watermarkConfig: {
+		where: 'account',
+		default: null as {
+			fileId: string | null;
+			fileUrl: string | null;
+			width: number | null;
+			height: number | null;
+			enlargement: 'scale-down' | 'contain' | 'cover' | 'crop' | 'pad';
+			gravity: 'auto' | 'left' | 'right' | 'top' | 'bottom';
+			opacity: number;
+			repeat: true | false | 'x' | 'y';
+			anchor: 'center' | 'top' | 'left' | 'bottom' | 'right' | 'top-left' | 'top-right' | 'bottom-left' | 'bottom-right';
+			offsetTop: number | null;
+			offsetLeft: number | null;
+			offsetBottom: number | null;
+			offsetRight: number | null;
+			backgroundColor: string | null;
+			rotate: number | null;
+		} | null,
+	},
 
 	sound_masterVolume: {
 		where: 'device',