diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index b991ec2e9b..ff0a2ac9f3 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -475,6 +475,8 @@ createAccount: "アカウントを作成"
 existingAccount: "既存のアカウント"
 regenerate: "再生成"
 fontSize: "フォントサイズ"
+mediaListWithOneImageAppearance: "画像が1枚のみのメディアリストの高さ"
+limitTo: "{x}を上限に"
 noFollowRequests: "フォロー申請はありません"
 openImageInNewTab: "画像を新しいタブで開く"
 dashboard: "ダッシュボード"
diff --git a/packages/frontend/src/components/MkImgWithBlurhash.vue b/packages/frontend/src/components/MkImgWithBlurhash.vue
index 9b3dbf8618..048dcc7045 100644
--- a/packages/frontend/src/components/MkImgWithBlurhash.vue
+++ b/packages/frontend/src/components/MkImgWithBlurhash.vue
@@ -1,12 +1,12 @@
 <template>
-<div :class="[$style.root, { [$style.cover]: cover }]" :title="title">
-	<canvas v-if="!loaded || forceBlurhash" ref="canvas" :class="$style.canvas" :width="size" :height="size" :title="title"/>
-	<img v-if="src && !forceBlurhash" :class="$style.img" :src="src" :title="title" :alt="alt" @load="onLoad"/>
+<div :class="[$style.root, { [$style.cover]: cover }]" :title="title ?? ''">
+	<canvas v-if="!loaded || forceBlurhash" ref="canvas" :class="$style.canvas" :width="width" :height="height" :title="title ?? ''"/>
+	<img v-if="src && !forceBlurhash" v-show="loaded" :class="$style.img" :src="src" :title="title ?? ''" :alt="alt ?? ''" @load="onLoad"/>
 </div>
 </template>
 
 <script lang="ts" setup>
-import { onMounted } from 'vue';
+import { onMounted, watch } from 'vue';
 import { decode } from 'blurhash';
 
 const props = withDefaults(defineProps<{
@@ -14,34 +14,55 @@ const props = withDefaults(defineProps<{
 	hash?: string;
 	alt?: string | null;
 	title?: string | null;
-	size?: number;
+	height?: number;
+	width?: number;
 	cover?: boolean;
 	forceBlurhash?: boolean;
 }>(), {
 	src: null,
 	alt: '',
 	title: null,
-	size: 64,
+	height: 64,
+	width: 64,
 	cover: true,
 	forceBlurhash: false,
 });
 
 const canvas = $shallowRef<HTMLCanvasElement>();
 let loaded = $ref(false);
-
-function draw() {
-	if (props.hash == null) return;
-	const pixels = decode(props.hash, props.size, props.size);
-	const ctx = canvas.getContext('2d');
-	const imageData = ctx!.createImageData(props.size, props.size);
-	imageData.data.set(pixels);
-	ctx!.putImageData(imageData, 0, 0);
-}
+let width = $ref(props.width);
+let height = $ref(props.height);
 
 function onLoad() {
 	loaded = true;
 }
 
+watch([() => props.width, () => props.height], () => {
+	const ratio = props.width / props.height;
+	if (ratio > 1) {
+		width = Math.round(64 * ratio);
+		height = 64;
+	} else {
+		width = 64;
+		height = Math.round(64 / ratio);
+	}
+}, {
+	immediate: true,
+});
+
+function draw() {
+	if (props.hash == null) return;
+	const pixels = decode(props.hash, width, height);
+	const ctx = canvas.getContext('2d');
+	const imageData = ctx!.createImageData(width, height);
+	imageData.data.set(pixels);
+	ctx!.putImageData(imageData, 0, 0);
+}
+
+watch(() => props.hash, () => {
+	draw();
+});
+
 onMounted(() => {
 	draw();
 });
@@ -54,6 +75,7 @@ onMounted(() => {
 	height: 100%;
 
 	&.cover {
+		> .canvas,
 		> .img {
 			object-fit: cover;
 		}
@@ -68,8 +90,7 @@ onMounted(() => {
 }
 
 .canvas {
-	position: absolute;
-	object-fit: cover;
+	object-fit: contain;
 }
 
 .img {
diff --git a/packages/frontend/src/components/MkMediaImage.vue b/packages/frontend/src/components/MkMediaImage.vue
index 8d0877ef61..b0219fc32d 100644
--- a/packages/frontend/src/components/MkMediaImage.vue
+++ b/packages/frontend/src/components/MkMediaImage.vue
@@ -1,6 +1,6 @@
 <template>
 <div v-if="hide" :class="$style.hidden" @click="hide = false">
-	<ImgWithBlurhash style="filter: brightness(0.5);" :hash="image.blurhash" :title="image.comment" :alt="image.comment" :force-blurhash="defaultStore.state.enableDataSaverMode" />
+	<ImgWithBlurhash style="filter: brightness(0.5);" :hash="image.blurhash" :title="image.comment" :alt="image.comment" :width="image.properties.width" :height="image.properties.height" :force-blurhash="defaultStore.state.enableDataSaverMode" />
 	<div :class="$style.hiddenText">
 		<div :class="$style.hiddenTextWrapper">
 			<b v-if="image.isSensitive" style="display: block;"><i class="ti ti-alert-triangle"></i> {{ i18n.ts.sensitive }}{{ defaultStore.state.enableDataSaverMode ? ` (${i18n.ts.image}${image.size ? ' ' + bytes(image.size) : ''})` : '' }}</b>
@@ -15,7 +15,7 @@
 		:href="image.url"
 		:title="image.name"
 	>
-		<ImgWithBlurhash :hash="image.blurhash" :src="url" :alt="image.comment || image.name" :title="image.comment || image.name" :cover="false"/>
+		<ImgWithBlurhash :hash="image.blurhash" :src="url" :alt="image.comment || image.name" :title="image.comment || image.name" :width="image.properties.width" :height="image.properties.height" :cover="false"/>
 	</a>
 	<div :class="$style.indicators">
 		<div v-if="['image/gif', 'image/apng'].includes(image.type)" :class="$style.indicator">GIF</div>
@@ -42,11 +42,12 @@ const props = defineProps<{
 let hide = $ref(true);
 let darkMode: boolean = $ref(defaultStore.state.darkMode);
 
-const url = (props.raw || defaultStore.state.loadRawImages)
+const url = $computed(() => (props.raw || defaultStore.state.loadRawImages)
 	? props.image.url
 	: defaultStore.state.disableShowingAnimatedImages
 		? getStaticImageUrl(props.image.url)
-		: props.image.thumbnailUrl;
+		: props.image.thumbnailUrl
+);
 
 // Plugin:register_note_view_interruptor を使って書き換えられる可能性があるためwatchする
 watch(() => props.image, () => {
diff --git a/packages/frontend/src/components/MkMediaList.vue b/packages/frontend/src/components/MkMediaList.vue
index d36cc2d26b..d28c78fe5c 100644
--- a/packages/frontend/src/components/MkMediaList.vue
+++ b/packages/frontend/src/components/MkMediaList.vue
@@ -2,10 +2,17 @@
 <div>
 	<XBanner v-for="media in mediaList.filter(media => !previewable(media))" :key="media.id" :media="media"/>
 	<div v-if="mediaList.filter(media => previewable(media)).length > 0" :class="$style.container">
-		<div ref="gallery" :class="[$style.medias, count <= 4 ? $style['n' + count] : $style.nMany]">
+		<div
+			ref="gallery"
+			:class="[
+				$style.medias,
+				count <= 4 ? $style['n' + count] : $style.nMany,
+				$style[`n1${defaultStore.reactiveState.mediaListWithOneImageAppearance.value}`]
+			]"
+		>
 			<template v-for="media in mediaList.filter(media => previewable(media))">
-				<XVideo v-if="media.type.startsWith('video')" :key="media.id" :class="$style.media" :video="media"/>
-				<XImage v-else-if="media.type.startsWith('image')" :key="media.id" :class="$style.media" class="image" :data-id="media.id" :image="media" :raw="raw"/>
+				<XVideo v-if="media.type.startsWith('video')" :key="`video:${media.id}`" :class="$style.media" :video="media"/>
+				<XImage v-else-if="media.type.startsWith('image')" :key="`image:${media.id}`" :class="$style.media" class="image" :data-id="media.id" :image="media" :raw="raw"/>
 			</template>
 		</div>
 	</div>
@@ -13,7 +20,7 @@
 </template>
 
 <script lang="ts" setup>
-import { onMounted, ref, useCssModule } from 'vue';
+import { onMounted, ref, useCssModule, watch } from 'vue';
 import * as misskey from 'misskey-js';
 import PhotoSwipeLightbox from 'photoswipe/lightbox';
 import PhotoSwipe from 'photoswipe';
@@ -23,6 +30,7 @@ import XImage from '@/components/MkMediaImage.vue';
 import XVideo from '@/components/MkMediaVideo.vue';
 import * as os from '@/os';
 import { FILE_TYPE_BROWSERSAFE } from '@/const';
+import { defaultStore } from '@/store';
 
 const props = defineProps<{
 	mediaList: misskey.entities.DriveFile[];
@@ -31,11 +39,42 @@ const props = defineProps<{
 
 const $style = useCssModule();
 
-const gallery = ref(null);
+const gallery = ref<HTMLDivElement>();
 const pswpZIndex = os.claimZIndex('middle');
 document.documentElement.style.setProperty('--mk-pswp-root-z-index', pswpZIndex.toString());
 const count = $computed(() => props.mediaList.filter(media => previewable(media)).length);
 
+function calcAspectRatio() {
+	if (!gallery.value) return;
+
+	let img = props.mediaList[0];
+
+	if (props.mediaList.length !== 1 || !(img.properties.width && img.properties.height)) {
+		gallery.value.style.aspectRatio = '';
+		return;
+	}
+
+	// アスペクト比上限設定では、横長の場合は高さを縮小させる
+	const ratioMax = (ratio: number) => `${Math.max(ratio, img.properties.width / img.properties.height).toString()} / 1`;
+
+	switch (defaultStore.state.mediaListWithOneImageAppearance) {
+		case '16_9':
+			gallery.value.style.aspectRatio = ratioMax(16 / 9);
+			break;
+		case '1_1':
+			gallery.value.style.aspectRatio = ratioMax(1);
+			break;
+		case '2_3':
+			gallery.value.style.aspectRatio = ratioMax(2 / 3);
+			break;
+		default:
+			gallery.value.style.aspectRatio = '';
+			break;
+	}
+}
+
+watch([defaultStore.reactiveState.mediaListWithOneImageAppearance, gallery], () => calcAspectRatio());
+
 onMounted(() => {
 	const lightbox = new PhotoSwipeLightbox({
 		dataSource: props.mediaList
@@ -155,12 +194,36 @@ const previewable = (file: misskey.entities.DriveFile): boolean => {
 	display: grid;
 	grid-gap: 8px;
 
-	// for webkit
 	height: 100%;
 
 	&.n1 {
-		aspect-ratio: 16/9;
 		grid-template-rows: 1fr;
+
+		// default (expand)
+		min-height: 64px;
+		max-height: clamp(
+			64px,
+			calc(var(--containerHeight, 100svh) * 0.5), // but --containerHeight can broken (too big)
+			min(334px, 50vh)
+		);
+
+		&.n116_9 {
+			min-height: none;
+			max-height: none;
+			aspect-ratio: 16 / 9; // fallback
+		}
+
+		&.n11_1{
+			min-height: none;
+			max-height: none;
+			aspect-ratio: 1 / 1; // fallback
+		}
+
+		&.n12_3 {
+			min-height: none;
+			max-height: none;
+			aspect-ratio: 2 / 3; // fallback
+		}
 	}
 
 	&.n2 {
diff --git a/packages/frontend/src/components/MkRadio.vue b/packages/frontend/src/components/MkRadio.vue
index fcf454c77a..5db2f5ee6d 100644
--- a/packages/frontend/src/components/MkRadio.vue
+++ b/packages/frontend/src/components/MkRadio.vue
@@ -24,7 +24,7 @@ import { } from 'vue';
 const props = defineProps<{
 	modelValue: any;
 	value: any;
-	disabled: boolean;
+	disabled?: boolean;
 }>();
 
 const emit = defineEmits<{
diff --git a/packages/frontend/src/components/MkRadios.vue b/packages/frontend/src/components/MkRadios.vue
index 8590ccf9ae..e2240fb4e1 100644
--- a/packages/frontend/src/components/MkRadios.vue
+++ b/packages/frontend/src/components/MkRadios.vue
@@ -1,5 +1,5 @@
 <script lang="ts">
-import { defineComponent, h } from 'vue';
+import { VNode, defineComponent, h } from 'vue';
 import MkRadio from './MkRadio.vue';
 
 export default defineComponent({
@@ -22,31 +22,33 @@ export default defineComponent({
 		},
 	},
 	render() {
+		console.log(this.$slots, this.$slots.label && this.$slots.label());
+		if (!this.$slots.default) return null;
 		let options = this.$slots.default();
 		const label = this.$slots.label && this.$slots.label();
 		const caption = this.$slots.caption && this.$slots.caption();
 
 		// なぜかFragmentになることがあるため
-		if (options.length === 1 && options[0].props == null) options = options[0].children;
+		if (options.length === 1 && options[0].props == null) options = options[0].children as VNode[];
 
 		return h('div', {
 			class: 'novjtcto',
 		}, [
 			...(label ? [h('div', {
 				class: 'label',
-			}, [label])] : []),
+			}, label)] : []),
 			h('div', {
 				class: 'body',
 			}, options.map(option => h(MkRadio, {
 				key: option.key,
-				value: option.props.value,
+				value: option.props?.value,
 				modelValue: this.value,
 				'onUpdate:modelValue': value => this.value = value,
-			}, option.children)),
+			}, () => option.children)),
 			),
 			...(caption ? [h('div', {
 				class: 'caption',
-			}, [caption])] : []),
+			}, caption)] : []),
 		]);
 	},
 });
diff --git a/packages/frontend/src/pages/settings/general.vue b/packages/frontend/src/pages/settings/general.vue
index 29657c04ac..a487a4622a 100644
--- a/packages/frontend/src/pages/settings/general.vue
+++ b/packages/frontend/src/pages/settings/general.vue
@@ -81,6 +81,14 @@
 				<option value="2"><span style="font-size: 16px;">Aa</span></option>
 				<option value="3"><span style="font-size: 17px;">Aa</span></option>
 			</MkRadios>
+
+			<MkRadios v-model="mediaListWithOneImageAppearance">
+				<template #label>{{ i18n.ts.mediaListWithOneImageAppearance }}</template>
+				<option value="expand">{{ i18n.ts.default }}</option>
+				<option value="16_9">{{ i18n.t('limitTo', { x: '16:9' }) }}</option>
+				<option value="1_1">{{ i18n.t('limitTo', { x: '1:1' }) }}</option>
+				<option value="2_3">{{ i18n.t('limitTo', { x: '2:3' }) }}</option>
+			</MkRadios>
 		</div>
 	</FormSection>
 
@@ -172,6 +180,7 @@ const enableInfiniteScroll = computed(defaultStore.makeGetterSetter('enableInfin
 const useReactionPickerForContextMenu = computed(defaultStore.makeGetterSetter('useReactionPickerForContextMenu'));
 const squareAvatars = computed(defaultStore.makeGetterSetter('squareAvatars'));
 const aiChanMode = computed(defaultStore.makeGetterSetter('aiChanMode'));
+const mediaListWithOneImageAppearance = computed(defaultStore.makeGetterSetter('mediaListWithOneImageAppearance'));
 
 watch(lang, () => {
 	miLocalStorage.setItem('lang', lang.value as string);
diff --git a/packages/frontend/src/pages/settings/preferences-backups.vue b/packages/frontend/src/pages/settings/preferences-backups.vue
index 092b9a9cc8..6613ce4c1d 100644
--- a/packages/frontend/src/pages/settings/preferences-backups.vue
+++ b/packages/frontend/src/pages/settings/preferences-backups.vue
@@ -88,6 +88,7 @@ const defaultStoreSaveKeys: (keyof typeof defaultStore['state'])[] = [
 	'squareAvatars',
 	'numberOfPageCache',
 	'aiChanMode',
+	'mediaListWithOneImageAppearance',
 ];
 const coldDeviceStorageSaveKeys: (keyof typeof ColdDeviceStorage.default)[] = [
 	'lightTheme',
diff --git a/packages/frontend/src/store.ts b/packages/frontend/src/store.ts
index a8e01b9385..a4f0f65e14 100644
--- a/packages/frontend/src/store.ts
+++ b/packages/frontend/src/store.ts
@@ -310,6 +310,10 @@ export const defaultStore = markRaw(new Storage('base', {
 		where: 'device',
 		default: false,
 	},
+	mediaListWithOneImageAppearance: {
+		where: 'device',
+		default: 'expand' as 'expand' | '16_9' | '1_1' | '2_3',
+	},
 }));
 
 // TODO: 他のタブと永続化されたstateを同期