diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 1f13f4fa2f..222a14d28d 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -40,8 +40,6 @@ jobs:
     needs: [pnpm_install]
     runs-on: ubuntu-latest
     continue-on-error: true
-    env:
-      eslint-cache-version: v1
     strategy:
       matrix:
         workspace:
@@ -49,6 +47,9 @@ jobs:
         - frontend
         - sw
         - misskey-js
+    env:
+      eslint-cache-version: v1
+      eslint-cache-path: ${{ github.workspace }}/node_modules/.cache/eslint-${{ matrix.workspace }}
     steps:
     - uses: actions/checkout@v4.1.1
       with:
@@ -64,11 +65,10 @@ jobs:
     - name: Restore eslint cache
       uses: actions/cache@v4.0.2
       with:
-        path: node_modules/.cache/eslint
-        key: eslint-${{ env.eslint-cache-version }}-${{ hashFiles('/pnpm-lock.yaml') }}-${{ github.ref_name }}-${{ github.sha }}
-        restore-keys: |
-          eslint-${{ env.eslint-cache-version }}-${{ hashFiles('/pnpm-lock.yaml') }}-
-    - run: pnpm --filter ${{ matrix.workspace }} run eslint --cache --cache-location node_modules/.cache/eslint --cache-strategy content
+        path: ${{ env.eslint-cache-path }}
+        key: eslint-${{ env.eslint-cache-version }}-${{ matrix.workspace }}-${{ hashFiles('**/pnpm-lock.yaml') }}-${{ github.ref_name }}-${{ github.sha }}
+        restore-keys: eslint-${{ env.eslint-cache-version }}-${{ matrix.workspace }}-${{ hashFiles('**/pnpm-lock.yaml') }}-
+    - run: pnpm --filter ${{ matrix.workspace }} run eslint --cache --cache-location ${{ env.eslint-cache-path }} --cache-strategy content
 
   typecheck:
     needs: [pnpm_install]
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7dba200216..e18cccba33 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 
 ### Client
 - サイズ制限を超過するファイルをアップロードしようとした際にエラーを出すように
+- Enhance: アイコンデコレーション管理画面にプレビューを追加
 - Enhance: コントロールパネル内のファイル一覧でセンシティブなファイルを区別しやすく
 - Fix: サーバーメトリクスが2つ以上あるとリロード直後の表示がおかしくなる問題を修正
 
diff --git a/packages/frontend/src/pages/avatar-decorations.vue b/packages/frontend/src/pages/avatar-decorations.vue
index ad9ec3c4ee..b377314856 100644
--- a/packages/frontend/src/pages/avatar-decorations.vue
+++ b/packages/frontend/src/pages/avatar-decorations.vue
@@ -12,19 +12,31 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<template #label>{{ avatarDecoration.name }}</template>
 				<template #caption>{{ avatarDecoration.description }}</template>
 
-				<div class="_gaps_m">
-					<MkInput v-model="avatarDecoration.name">
-						<template #label>{{ i18n.ts.name }}</template>
-					</MkInput>
-					<MkTextarea v-model="avatarDecoration.description">
-						<template #label>{{ i18n.ts.description }}</template>
-					</MkTextarea>
-					<MkInput v-model="avatarDecoration.url">
-						<template #label>{{ i18n.ts.imageUrl }}</template>
-					</MkInput>
-					<div class="buttons _buttons">
-						<MkButton class="button" inline primary @click="save(avatarDecoration)"><i class="ti ti-device-floppy"></i> {{ i18n.ts.save }}</MkButton>
-						<MkButton v-if="avatarDecoration.id != null" class="button" inline danger @click="del(avatarDecoration)"><i class="ti ti-trash"></i> {{ i18n.ts.delete }}</MkButton>
+				<div :class="$style.editorRoot">
+					<div :class="$style.editorWrapper">
+						<div :class="$style.preview">
+							<div :class="[$style.previewItem, $style.light]">
+								<MkAvatar style="width: 60px; height: 60px;" :user="$i" :decorations="[avatarDecoration]" forceShowDecoration/>
+							</div>
+							<div :class="[$style.previewItem, $style.dark]">
+								<MkAvatar style="width: 60px; height: 60px;" :user="$i" :decorations="[avatarDecoration]" forceShowDecoration/>
+							</div>
+						</div>
+						<div class="_gaps_m">
+							<MkInput v-model="avatarDecoration.name">
+								<template #label>{{ i18n.ts.name }}</template>
+							</MkInput>
+							<MkTextarea v-model="avatarDecoration.description">
+								<template #label>{{ i18n.ts.description }}</template>
+							</MkTextarea>
+							<MkInput v-model="avatarDecoration.url">
+								<template #label>{{ i18n.ts.imageUrl }}</template>
+							</MkInput>
+							<div class="_buttons">
+								<MkButton inline primary @click="save(avatarDecoration)"><i class="ti ti-device-floppy"></i> {{ i18n.ts.save }}</MkButton>
+								<MkButton v-if="avatarDecoration.id != null" inline danger @click="del(avatarDecoration)"><i class="ti ti-trash"></i> {{ i18n.ts.delete }}</MkButton>
+							</div>
+						</div>
 					</div>
 				</div>
 			</MkFolder>
@@ -39,6 +51,7 @@ import * as Misskey from 'misskey-js';
 import MkButton from '@/components/MkButton.vue';
 import MkInput from '@/components/MkInput.vue';
 import MkTextarea from '@/components/MkTextarea.vue';
+import { signinRequired } from '@/account.js';
 import * as os from '@/os.js';
 import { misskeyApi } from '@/scripts/misskey-api.js';
 import { i18n } from '@/i18n.js';
@@ -47,6 +60,8 @@ import MkFolder from '@/components/MkFolder.vue';
 
 const avatarDecorations = ref<Misskey.entities.AdminAvatarDecorationsListResponse>([]);
 
+const $i = signinRequired();
+
 function add() {
 	avatarDecorations.value.unshift({
 		_id: Math.random().toString(36),
@@ -99,3 +114,55 @@ definePageMetadata(() => ({
 	icon: 'ti ti-sparkles',
 }));
 </script>
+
+<style lang="scss" module>
+.editorRoot {
+	container: editor / inline-size;
+}
+
+.editorWrapper {
+	display: grid;
+	grid-template-columns: 1fr;
+	grid-template-rows: auto auto;
+	gap: var(--margin);
+}
+
+.preview {
+	display: grid;
+	place-items: center;
+	grid-template-columns: 1fr 1fr;
+	grid-template-rows: 1fr;
+	gap: var(--margin);
+}
+
+.previewItem {
+	width: 100%;
+	height: 100%;
+	min-height: 160px;
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	border-radius: var(--radius);
+
+	&.light {
+		background: #eee;
+	}
+
+	&.dark {
+		background: #222;
+	}
+}
+
+@container editor (min-width: 600px) {
+	.editorWrapper {
+		grid-template-columns: 200px 1fr;
+		grid-template-rows: 1fr;
+		gap: calc(var(--margin) * 2);
+	}
+
+	.preview {
+		grid-template-columns: 1fr;
+		grid-template-rows: 1fr 1fr;
+	}
+}
+</style>