feat(frontend): 自分のプロフィールページの二次元コード(QRコード)を表示し、他の人のコードを読み取りするページを追加 (#16456)

* wip (qr.show.vue)

* added to navbar

* qr.show.vue

* fix

* added to navbar

* fix size

* :art:

* :art:

* fix div warn

* fix

* use * 0.25

* fix??

* fix lint

* clean up

* ???

* ?

* fix

* :art:

* :art:

* refactor

* :art:

* :art:

* :ar:t

* :art:

* iphone flip

* no lazy import

* :art:

* :art:

* :art:

* ユーザー全部flipでいいや

* :v:

* fix

* fix

* fix lint

* :art:

* fix type

* fix: local user profile url cannot be resolved with ap/show

* fix: local user url with hostname could not be resolved

* chore: use common utility for checking self host

* wip

* :art:

* :art:

* fix imports

* fix

* fix

* fix

* :art:

* fix...

* set spacer-w

* :v:

* 全画面でQRを読むように

* fix

* :art:

* modify navbar.ts

* start/stop on vue activation

* display raw content read from qr

* 端末のQRをスキャンするボタンを追加

* chore

* やっぱりmfmを先に表示する

* :art:

* fix 18n

* QRの内容は/users/:userIdにする

* add spdx

* use cqh

* `defineProps` is a compiler macro and no longer needs to be imported.

* use MkUserName

* 🎨

* 🎨

* refactor

* clean up

* refactor

* 🎨

* Update qr.show.vue

* Misskeyロゴにdrop-shadowを追加

* clean up: do not use empty css

* fix os.select usage

* Update qr.vue

* Update qr.show.vue

* Update qr.show.vue

* Update get-user-menu.ts

* ✌️

* Update show.ts

* Update ja-JP.yml

* watermark

* Update CHANGELOG.md

* Update qr.read.vue

* Update qr.read.vue

* wip

* Update MkWatermarkEditorDialog.Layer.vue

---------

Co-authored-by: anatawa12 <anatawa12@icloud.com>
Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

17 files changed, 997 insertions, 61 deletions

diff --git a/packages/frontend/src/components/MkPolkadots.vue b/packages/frontend/src/components/MkPolkadots.vue
index 285c4d0b79..4f1346b685 100644
--- a/packages/frontend/src/components/MkPolkadots.vue
+++ b/packages/frontend/src/components/MkPolkadots.vue
@@ -4,14 +4,18 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<div :class="[$style.root, accented ? $style.accented : null]"></div>
+<div :class="[$style.root, accented ? $style.accented : null, revered ? $style.revered : null]"/>
 </template>
 
 <script lang="ts" setup>
 const props = withDefaults(defineProps<{
 	accented?: boolean;
+	revered?: boolean;
+	height?: number;
 }>(), {
 	accented: false,
+	revered: false,
+	height: 200,
 });
 </script>
 
@@ -27,14 +31,17 @@ const props = withDefaults(defineProps<{
 	--dot-size: 2px;
 	--gap-size: 40px;
 	--offset: calc(var(--gap-size) / 2);
+	--height: v-bind('props.height + "px"');
 
-	height: 200px;
-	margin-bottom: -200px;
-
+	height: var(--height);
 	background-image: linear-gradient(transparent 60%, transparent 100%), radial-gradient(var(--c) var(--dot-size), transparent var(--dot-size)), radial-gradient(var(--c) var(--dot-size), transparent var(--dot-size));
 	background-position: 0 0, 0 0, var(--offset) var(--offset);
 	background-size: 100% 100%, var(--gap-size) var(--gap-size), var(--gap-size) var(--gap-size);
 	mask-image: linear-gradient(to bottom, black 0%, transparent 100%);
 	pointer-events: none;
+
+	&.revered {
+		mask-image: linear-gradient(to top, black 0%, transparent 100%);
+	}
 }
 </style>
diff --git a/packages/frontend/src/components/MkPositionSelector.vue b/packages/frontend/src/components/MkPositionSelector.vue
index 739f55125b..6f12aada30 100644
--- a/packages/frontend/src/components/MkPositionSelector.vue
+++ b/packages/frontend/src/components/MkPositionSelector.vue
@@ -6,15 +6,15 @@ SPDX-License-Identifier: AGPL-3.0-only
 <template>
 <div :class="[$style.root]">
 	<div :class="$style.items">
-		<button class="_button" :class="[$style.item, x === 'left' && y === 'top' ? $style.active : null]" @click="() => { x = 'left'; y = 'top'; }"><i class="ti ti-align-box-left-top"></i></button>
-		<button class="_button" :class="[$style.item, x === 'center' && y === 'top' ? $style.active : null]" @click="() => { x = 'center'; y = 'top'; }"><i class="ti ti-align-box-center-top"></i></button>
-		<button class="_button" :class="[$style.item, x === 'right' && y === 'top' ? $style.active : null]" @click="() => { x = 'right'; y = 'top'; }"><i class="ti ti-align-box-right-top"></i></button>
-		<button class="_button" :class="[$style.item, x === 'left' && y === 'center' ? $style.active : null]" @click="() => { x = 'left'; y = 'center'; }"><i class="ti ti-align-box-left-middle"></i></button>
-		<button class="_button" :class="[$style.item, x === 'center' && y === 'center' ? $style.active : null]" @click="() => { x = 'center'; y = 'center'; }"><i class="ti ti-align-box-center-middle"></i></button>
-		<button class="_button" :class="[$style.item, x === 'right' && y === 'center' ? $style.active : null]" @click="() => { x = 'right'; y = 'center'; }"><i class="ti ti-align-box-right-middle"></i></button>
-		<button class="_button" :class="[$style.item, x === 'left' && y === 'bottom' ? $style.active : null]" @click="() => { x = 'left'; y = 'bottom'; }"><i class="ti ti-align-box-left-bottom"></i></button>
-		<button class="_button" :class="[$style.item, x === 'center' && y === 'bottom' ? $style.active : null]" @click="() => { x = 'center'; y = 'bottom'; }"><i class="ti ti-align-box-center-bottom"></i></button>
-		<button class="_button" :class="[$style.item, x === 'right' && y === 'bottom' ? $style.active : null]" @click="() => { x = 'right'; y = 'bottom'; }"><i class="ti ti-align-box-right-bottom"></i></button>
+		<button v-panel class="_button" :class="[$style.item, x === 'left' && y === 'top' ? $style.active : null]" @click="() => { x = 'left'; y = 'top'; }"><i class="ti ti-arrow-up-left"></i></button>
+		<button v-panel class="_button" :class="[$style.item, x === 'center' && y === 'top' ? $style.active : null]" @click="() => { x = 'center'; y = 'top'; }"><i class="ti ti-arrow-up"></i></button>
+		<button v-panel class="_button" :class="[$style.item, x === 'right' && y === 'top' ? $style.active : null]" @click="() => { x = 'right'; y = 'top'; }"><i class="ti ti-arrow-up-right"></i></button>
+		<button v-panel class="_button" :class="[$style.item, x === 'left' && y === 'center' ? $style.active : null]" @click="() => { x = 'left'; y = 'center'; }"><i class="ti ti-arrow-left"></i></button>
+		<button v-panel class="_button" :class="[$style.item, x === 'center' && y === 'center' ? $style.active : null]" @click="() => { x = 'center'; y = 'center'; }"><i class="ti ti-focus-2"></i></button>
+		<button v-panel class="_button" :class="[$style.item, x === 'right' && y === 'center' ? $style.active : null]" @click="() => { x = 'right'; y = 'center'; }"><i class="ti ti-arrow-right"></i></button>
+		<button v-panel class="_button" :class="[$style.item, x === 'left' && y === 'bottom' ? $style.active : null]" @click="() => { x = 'left'; y = 'bottom'; }"><i class="ti ti-arrow-down-left"></i></button>
+		<button v-panel class="_button" :class="[$style.item, x === 'center' && y === 'bottom' ? $style.active : null]" @click="() => { x = 'center'; y = 'bottom'; }"><i class="ti ti-arrow-down"></i></button>
+		<button v-panel class="_button" :class="[$style.item, x === 'right' && y === 'bottom' ? $style.active : null]" @click="() => { x = 'right'; y = 'bottom'; }"><i class="ti ti-arrow-down-right"></i></button>
 	</div>
 </div>
 </template>
diff --git a/packages/frontend/src/components/MkWatermarkEditorDialog.Layer.vue b/packages/frontend/src/components/MkWatermarkEditorDialog.Layer.vue
index 11ae091d90..288293db3f 100644
--- a/packages/frontend/src/components/MkWatermarkEditorDialog.Layer.vue
+++ b/packages/frontend/src/components/MkWatermarkEditorDialog.Layer.vue
@@ -19,6 +19,18 @@ SPDX-License-Identifier: AGPL-3.0-only
 		</FormSlot>
 
 		<MkRange
+			:modelValue="layer.align.margin ?? 0"
+			:min="0"
+			:max="0.25"
+			:step="0.01"
+			:textConverter="(v) => (v * 100).toFixed(1) + '%'"
+			continuousUpdate
+			@update:modelValue="(v) => (layer as Extract<WatermarkPreset['layers'][number], { type: 'text' }>).align.margin = v"
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.margin }}</template>
+		</MkRange>
+
+		<MkRange
 			v-model="layer.scale"
 			:min="0"
 			:max="1"
@@ -67,6 +79,18 @@ SPDX-License-Identifier: AGPL-3.0-only
 		</FormSlot>
 
 		<MkRange
+			:modelValue="layer.align.margin ?? 0"
+			:min="0"
+			:max="0.25"
+			:step="0.01"
+			:textConverter="(v) => (v * 100).toFixed(1) + '%'"
+			continuousUpdate
+			@update:modelValue="(v) => (layer as Extract<WatermarkPreset['layers'][number], { type: 'image' }>).align.margin = v"
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.margin }}</template>
+		</MkRange>
+
+		<MkRange
 			v-model="layer.scale"
 			:min="0"
 			:max="1"
@@ -107,6 +131,55 @@ SPDX-License-Identifier: AGPL-3.0-only
 		</MkSwitch>
 	</template>
 
+	<template v-else-if="layer.type === 'qr'">
+		<MkInput v-model="layer.data" debounce>
+			<template #label>{{ i18n.ts._watermarkEditor.text }}</template>
+			<template #caption>{{ i18n.ts._watermarkEditor.leaveBlankToAccountUrl }}</template>
+		</MkInput>
+
+		<FormSlot>
+			<template #label>{{ i18n.ts._watermarkEditor.position }}</template>
+			<MkPositionSelector
+				v-model:x="layer.align.x"
+				v-model:y="layer.align.y"
+			></MkPositionSelector>
+		</FormSlot>
+
+		<MkRange
+			:modelValue="layer.align.margin ?? 0"
+			:min="0"
+			:max="0.25"
+			:step="0.01"
+			:textConverter="(v) => (v * 100).toFixed(1) + '%'"
+			continuousUpdate
+			@update:modelValue="(v) => (layer as Extract<WatermarkPreset['layers'][number], { type: 'qr' }>).align.margin = v"
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.margin }}</template>
+		</MkRange>
+
+		<MkRange
+			v-model="layer.scale"
+			:min="0"
+			:max="1"
+			:step="0.01"
+			:textConverter="(v) => (v * 100).toFixed(1) + '%'"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.scale }}</template>
+		</MkRange>
+
+		<MkRange
+			v-model="layer.opacity"
+			:min="0"
+			:max="1"
+			:step="0.01"
+			:textConverter="(v) => (v * 100).toFixed(1) + '%'"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.opacity }}</template>
+		</MkRange>
+	</template>
+
 	<template v-else-if="layer.type === 'stripe'">
 		<MkRange
 			v-model="layer.frequency"
diff --git a/packages/frontend/src/components/MkWatermarkEditorDialog.vue b/packages/frontend/src/components/MkWatermarkEditorDialog.vue
index 75a45548fd..0d0488d9bc 100644
--- a/packages/frontend/src/components/MkWatermarkEditorDialog.vue
+++ b/packages/frontend/src/components/MkWatermarkEditorDialog.vue
@@ -30,22 +30,12 @@ SPDX-License-Identifier: AGPL-3.0-only
 			</div>
 			<div :class="$style.controls">
 				<div class="_spacer _gaps">
-					<MkSelect v-model="type" :items="typeDef">
-						<template #label>{{ i18n.ts._watermarkEditor.type }}</template>
-					</MkSelect>
-
-					<div v-if="type === 'text' || type === 'image'">
-						<XLayer
-							v-for="(layer, i) in preset.layers"
-							:key="layer.id"
-							v-model:layer="preset.layers[i]"
-						></XLayer>
-					</div>
-					<div v-else-if="type === 'advanced'" class="_gaps_s">
+					<div class="_gaps_s">
 						<MkFolder v-for="(layer, i) in preset.layers" :key="layer.id" :defaultOpen="false" :canPage="false">
 							<template #label>
 								<div v-if="layer.type === 'text'">{{ i18n.ts._watermarkEditor.text }}</div>
 								<div v-if="layer.type === 'image'">{{ i18n.ts._watermarkEditor.image }}</div>
+								<div v-if="layer.type === 'qr'">{{ i18n.ts._watermarkEditor.qr }}</div>
 								<div v-if="layer.type === 'stripe'">{{ i18n.ts._watermarkEditor.stripe }}</div>
 								<div v-if="layer.type === 'polkadot'">{{ i18n.ts._watermarkEditor.polkadot }}</div>
 								<div v-if="layer.type === 'checker'">{{ i18n.ts._watermarkEditor.checker }}</div>
@@ -95,7 +85,7 @@ function createTextLayer(): WatermarkPreset['layers'][number] {
 		id: genId(),
 		type: 'text',
 		text: `(c) @${$i.username}`,
-		align: { x: 'right', y: 'bottom' },
+		align: { x: 'right', y: 'bottom', margin: 0 },
 		scale: 0.3,
 		angle: 0,
 		opacity: 0.75,
@@ -109,7 +99,7 @@ function createImageLayer(): WatermarkPreset['layers'][number] {
 		type: 'image',
 		imageId: null,
 		imageUrl: null,
-		align: { x: 'right', y: 'bottom' },
+		align: { x: 'right', y: 'bottom', margin: 0 },
 		scale: 0.3,
 		angle: 0,
 		opacity: 0.75,
@@ -118,6 +108,17 @@ function createImageLayer(): WatermarkPreset['layers'][number] {
 	};
 }
 
+function createQrLayer(): WatermarkPreset['layers'][number] {
+	return {
+		id: genId(),
+		type: 'qr',
+		data: '',
+		align: { x: 'right', y: 'bottom', margin: 0 },
+		scale: 0.3,
+		opacity: 1,
+	};
+}
+
 function createStripeLayer(): WatermarkPreset['layers'][number] {
 	return {
 		id: genId(),
@@ -165,7 +166,7 @@ const props = defineProps<{
 const preset = reactive<WatermarkPreset>(deepClone(props.preset) ?? {
 	id: genId(),
 	name: '',
-	layers: [createTextLayer()],
+	layers: [],
 });
 
 const emit = defineEmits<{
@@ -187,28 +188,6 @@ async function cancel() {
 	dialog.value?.close();
 }
 
-const {
-	model: type,
-	def: typeDef,
-} = useMkSelect({
-	items: [
-		{ label: i18n.ts._watermarkEditor.text, value: 'text' },
-		{ label: i18n.ts._watermarkEditor.image, value: 'image' },
-		{ label: i18n.ts._watermarkEditor.advanced, value: 'advanced' },
-	],
-	initialValue: preset.layers.length > 1 ? 'advanced' : preset.layers[0].type,
-});
-
-watch(type, () => {
-	if (type.value === 'text') {
-		preset.layers = [createTextLayer()];
-	} else if (type.value === 'image') {
-		preset.layers = [createImageLayer()];
-	} else if (type.value === 'advanced') {
-		// nop
-	}
-});
-
 watch(preset, async (newValue, oldValue) => {
 	if (renderer != null) {
 		renderer.setLayers(preset.layers);
@@ -339,6 +318,11 @@ function addLayer(ev: MouseEvent) {
 			preset.layers.push(createImageLayer());
 		},
 	}, {
+		text: i18n.ts._watermarkEditor.qr,
+		action: () => {
+			preset.layers.push(createQrLayer());
+		},
+	}, {
 		text: i18n.ts._watermarkEditor.stripe,
 		action: () => {
 			preset.layers.push(createStripeLayer());
diff --git a/packages/frontend/src/navbar.ts b/packages/frontend/src/navbar.ts
index aec1c7ae4c..a162b3aa9e 100644
--- a/packages/frontend/src/navbar.ts
+++ b/packages/frontend/src/navbar.ts
@@ -66,6 +66,12 @@ export const navbarItemDef = reactive({
 			lookup();
 		},
 	},
+	qr: {
+		title: i18n.ts.qr,
+		icon: 'ti ti-qrcode',
+		show: computed(() => $i != null),
+		to: '/qr',
+	},
 	lists: {
 		title: i18n.ts.lists,
 		icon: 'ti ti-list',
diff --git a/packages/frontend/src/pages/chat/home.vue b/packages/frontend/src/pages/chat/home.vue
index 2af0e0b443..5c773a241b 100644
--- a/packages/frontend/src/pages/chat/home.vue
+++ b/packages/frontend/src/pages/chat/home.vue
@@ -5,7 +5,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <template>
 <PageWithHeader v-model:tab="tab" :actions="headerActions" :tabs="headerTabs" :swipable="true">
-	<MkPolkadots v-if="tab === 'home'" accented/>
+	<MkPolkadots v-if="tab === 'home'" accented :height="200" style="margin-bottom: -200px;"/>
 	<div class="_spacer" style="--MI_SPACER-w: 700px;">
 		<XHome v-if="tab === 'home'"/>
 		<XInvitations v-else-if="tab === 'invitations'"/>
diff --git a/packages/frontend/src/pages/qr.read.raw-viewer.vue b/packages/frontend/src/pages/qr.read.raw-viewer.vue
new file mode 100644
index 0000000000..5a23e2322d
--- /dev/null
+++ b/packages/frontend/src/pages/qr.read.raw-viewer.vue
@@ -0,0 +1,54 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<MkFolder defaultOpen :withSpacer="false">
+	<template #label>{{ data.split('\n')[0] }}</template>
+	<template #header>
+		<MkTabs
+			v-model:tab="tab"
+			:tabs="[
+				{
+					key: 'mfm',
+					title: i18n.ts._qr.mfm,
+					icon: 'ti ti-align-left',
+				},
+				{
+					key: 'raw',
+					title: i18n.ts._qr.raw,
+					icon: 'ti ti-code',
+				},
+			]"
+		/>
+	</template>
+
+	<div v-show="tab === 'mfm'" class="_spacer _gaps">
+		<Mfm :text="data" :nyaize="false"/>
+		<MkUrlPreview v-for="url in urls" :key="url" :url="url" :compact="true" :detail="false"/>
+	</div>
+	<div v-show="tab === 'raw'" class="_spacer" style="--MI_SPACER-min: 10px; --MI_SPACER-max: 16px;">
+		<MkCode :code="data" lang="text"/>
+	</div>
+</MkFolder>
+</template>
+
+<script lang="ts" setup>
+import { ref, computed } from 'vue';
+import * as mfm from 'mfm-js';
+import MkFolder from '@/components/MkFolder.vue';
+import MkTabs from '@/components/MkTabs.vue';
+import { extractUrlFromMfm } from '@/utility/extract-url-from-mfm';
+import MkCode from '@/components/MkCode.vue';
+import MkUrlPreview from '@/components/MkUrlPreview.vue';
+import { i18n } from '@/i18n.js';
+
+const props = defineProps<{
+	data: string;
+}>();
+
+const parsed = computed(() => mfm.parse(props.data));
+const urls = computed(() => extractUrlFromMfm(parsed.value));
+const tab = ref<'mfm' | 'raw'>('mfm');
+</script>
diff --git a/packages/frontend/src/pages/qr.read.vue b/packages/frontend/src/pages/qr.read.vue
new file mode 100644
index 0000000000..e4c475196a
--- /dev/null
+++ b/packages/frontend/src/pages/qr.read.vue
@@ -0,0 +1,397 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div
+	ref="rootEl"
+	:class="$style.root"
+	:style="{
+		'--MI-QrReadViewHeight': 'calc(100cqh - var(--MI-stickyTop, 0px) - var(--MI-stickyBottom, 0px))',
+		'--MI-QrReadVideoHeight': 'min(calc(var(--MI-QrReadViewHeight) * 0.3), 512px)',
+	}"
+>
+	<MkStickyContainer>
+		<template #header>
+			<div :class="$style.view">
+				<video ref="videoEl" :class="$style.video" autoplay muted playsinline></video>
+				<div ref="overlayEl" :class="$style.overlay"></div>
+				<div :class="$style.controls">
+					<MkButton v-tooltip="i18n.ts._qr.scanFile" iconOnly @click="upload"><i class="ti ti-photo-plus"></i></MkButton>
+
+					<MkButton v-if="qrStarted" v-tooltip="i18n.ts._qr.stopQr" iconOnly @click="stopQr"><i class="ti ti-player-play"></i></MkButton>
+					<MkButton v-else v-tooltip="i18n.ts._qr.startQr" iconOnly danger @click="startQr"><i class="ti ti-player-pause"></i></MkButton>
+
+					<MkButton v-tooltip="i18n.ts._qr.chooseCamera" iconOnly @click="chooseCamera"><i class="ti ti-camera-rotate"></i></MkButton>
+
+					<MkButton v-if="!flashCanToggle" v-tooltip="i18n.ts._qr.cannotToggleFlash" iconOnly disabled><i class="ti ti-bolt"></i></MkButton>
+					<MkButton v-else-if="!flash" v-tooltip="i18n.ts._qr.turnOnFlash" iconOnly @click="toggleFlash(true)"><i class="ti ti-bolt-off"></i></MkButton>
+					<MkButton v-else v-tooltip="i18n.ts._qr.turnOffFlash" iconOnly @click="toggleFlash(false)"><i class="ti ti-bolt-filled"></i></MkButton>
+				</div>
+			</div>
+		</template>
+		<div
+			:class="['_spacer', $style.contents]"
+			:style="{
+				'--MI_SPACER-w': '800px'
+			}"
+		>
+			<MkStickyContainer>
+				<template #header>
+					<MkTab v-model="tab" :class="$style.tab">
+						<option value="users">{{ i18n.ts.users }}</option>
+						<option value="notes">{{ i18n.ts.notes }}</option>
+						<option value="all">{{ i18n.ts.all }}</option>
+					</MkTab>
+				</template>
+				<div v-if="tab === 'users'" :class="[$style.users, '_margin']" style="padding-bottom: var(--MI-margin);">
+					<MkUserInfo v-for="user in users" :key="user.id" :user="user"/>
+				</div>
+				<div v-else-if="tab === 'notes'" class="_margin _gaps" style="padding-bottom: var(--MI-margin);">
+					<MkNote v-for="note in notes" :key="note.id" :note="note" :class="$style.note"/>
+				</div>
+				<div v-else-if="tab === 'all'" class="_margin _gaps" style="padding-bottom: var(--MI-margin);">
+					<MkQrReadRawViewer v-for="result in Array.from(results).reverse()" :key="result" :data="result"/>
+				</div>
+			</MkStickyContainer>
+		</div>
+	</MkStickyContainer>
+</div>
+</template>
+
+<script lang="ts" setup>
+import QrScanner from 'qr-scanner';
+import { onActivated, onDeactivated, onMounted, onUnmounted, ref, shallowRef, useTemplateRef, watch } from 'vue';
+import * as misskey from 'misskey-js';
+import { getScrollContainer } from '@@/js/scroll.js';
+import type { ApShowResponse } from 'misskey-js/entities.js';
+import * as os from '@/os.js';
+import { i18n } from '@/i18n.js';
+import MkUserInfo from '@/components/MkUserInfo.vue';
+import { misskeyApi } from '@/utility/misskey-api.js';
+import MkNote from '@/components/MkNote.vue';
+import MkTab from '@/components/MkTab.vue';
+import MkButton from '@/components/MkButton.vue';
+import MkQrReadRawViewer from '@/pages/qr.read.raw-viewer.vue';
+
+const LIST_RERENDER_INTERVAL = 1500;
+
+const rootEl = useTemplateRef('rootEl');
+const videoEl = useTemplateRef('videoEl');
+const overlayEl = useTemplateRef('overlayEl');
+
+const scannerInstance = shallowRef<QrScanner | null>(null);
+
+const tab = ref<'users' | 'notes' | 'all'>('users');
+
+// higher is recent
+const results = ref(new Set<string>());
+// lower is recent
+const uris = ref<string[]>([]);
+const sources = new Map<string, ApShowResponse | null>();
+const users = ref<(misskey.entities.UserDetailed)[]>([]);
+const usersCount = ref(0);
+const notes = ref<misskey.entities.Note[]>([]);
+const notesCount = ref(0);
+
+const timer = ref<number | null>(null);
+
+function updateLists() {
+	const responses = uris.value.map(uri => sources.get(uri)).filter((r): r is ApShowResponse => !!r);
+	users.value = responses.filter(r => r.type === 'User').map(r => r.object).filter((u): u is misskey.entities.UserDetailed => !!u);
+	usersCount.value = users.value.length;
+	notes.value = responses.filter(r => r.type === 'Note').map(r => r.object).filter((n): n is misskey.entities.Note => !!n);
+	notesCount.value = notes.value.length;
+	updateRequired.value = false;
+}
+
+const updateRequired = ref(false);
+
+watch(uris, () => {
+	if (timer.value) {
+		updateRequired.value = true;
+		return;
+	}
+
+	updateLists();
+
+	timer.value = window.setTimeout(() => {
+		timer.value = null;
+		if (updateRequired.value) {
+			updateLists();
+		}
+	}, LIST_RERENDER_INTERVAL) as number;
+});
+
+watch(tab, () => {
+	if (timer.value) {
+		window.clearTimeout(timer.value);
+		timer.value = null;
+	}
+	updateLists();
+});
+
+async function processResult(result: QrScanner.ScanResult) {
+	if (!result) return;
+	const trimmed = result.data.trim();
+
+	if (!trimmed) return;
+
+	const haveExisted = results.value.has(trimmed);
+	results.value.add(trimmed);
+
+	try {
+		new URL(trimmed);
+	} catch {
+		if (!haveExisted) {
+			tab.value = 'all';
+		}
+		return;
+	}
+
+	if (uris.value[0] !== trimmed) {
+		// 並べ替え
+		uris.value = [trimmed, ...uris.value.slice(0, 29).filter(u => u !== trimmed)];
+	}
+
+	if (sources.has(trimmed)) return;
+	// Start fetching user info
+	sources.set(trimmed, null);
+
+	await misskeyApi('ap/show', { uri: trimmed })
+		.then(data => {
+			if (data.type === 'User') {
+				sources.set(trimmed, data);
+				tab.value = 'users';
+			} else if (data.type === 'Note') {
+				sources.set(trimmed, data);
+				tab.value = 'notes';
+			}
+			updateLists();
+		})
+		.catch(err => {
+			tab.value = 'all';
+			throw err;
+		});
+}
+
+const qrStarted = ref(true);
+const flashCanToggle = ref(false);
+const flash = ref(false);
+
+async function upload() {
+	os.chooseFileFromPc({ multiple: true }).then(files => {
+		if (files.length === 0) return;
+		for (const file of files) {
+			QrScanner.scanImage(file, { returnDetailedScanResult: true })
+				.then(result => {
+					processResult(result);
+				})
+				.catch(err => {
+					if (err.toString().includes('No QR code found')) {
+						os.alert({
+							type: 'info',
+							text: i18n.ts._qr.noQrCodeFound,
+						});
+					} else {
+						os.alert({
+							type: 'error',
+							text: err.toString(),
+						});
+						console.error(err);
+					}
+				});
+		}
+	});
+}
+
+async function chooseCamera() {
+	if (!scannerInstance.value) return;
+	const cameras = await QrScanner.listCameras(true);
+	if (cameras.length === 0) {
+		os.alert({
+			type: 'error',
+		});
+		return;
+	}
+
+	const select = await os.select({
+		title: i18n.ts._qr.chooseCamera,
+		items: cameras.map(camera => ({
+			label: camera.label,
+			value: camera.id,
+		})),
+	});
+	if (select.canceled) return;
+	if (select.result == null) return;
+
+	await scannerInstance.value.setCamera(select.result);
+	flashCanToggle.value = await scannerInstance.value.hasFlash();
+	flash.value = scannerInstance.value.isFlashOn();
+}
+
+async function toggleFlash(to = false) {
+	if (!scannerInstance.value) return;
+
+	flash.value = to;
+	if (flash.value) {
+		await scannerInstance.value.turnFlashOn();
+	} else {
+		await scannerInstance.value.turnFlashOff();
+	}
+}
+
+async function startQr() {
+	if (!scannerInstance.value) return;
+	await scannerInstance.value.start();
+	qrStarted.value = true;
+}
+
+function stopQr() {
+	if (!scannerInstance.value) return;
+	scannerInstance.value.stop();
+	qrStarted.value = false;
+}
+
+onActivated(() => {
+	startQr;
+});
+
+onDeactivated(() => {
+	stopQr;
+});
+
+const alertLock = ref(false);
+
+onMounted(() => {
+	if (!videoEl.value || !overlayEl.value) {
+		os.alert({
+			type: 'error',
+			text: i18n.ts.somethingHappened,
+		});
+		return;
+	}
+
+	scannerInstance.value = new QrScanner(
+		videoEl.value,
+		processResult,
+		{
+			highlightScanRegion: true,
+			highlightCodeOutline: true,
+			overlay: overlayEl.value,
+			calculateScanRegion(video: HTMLVideoElement): QrScanner.ScanRegion {
+				const aspectRatio = video.videoWidth / video.videoHeight;
+				const SHORT_SIDE_SIZE_DOWNSCALED = 360;
+				return {
+					x: 0,
+					y: 0,
+					width: video.videoWidth,
+					height: video.videoHeight,
+					downScaledWidth: aspectRatio > 1 ? Math.round(SHORT_SIDE_SIZE_DOWNSCALED * aspectRatio) : SHORT_SIDE_SIZE_DOWNSCALED,
+					downScaledHeight: aspectRatio > 1 ? SHORT_SIDE_SIZE_DOWNSCALED : Math.round(SHORT_SIDE_SIZE_DOWNSCALED / aspectRatio),
+				};
+			},
+			onDecodeError(err) {
+				if (err.toString().includes('No QR code found')) return;
+				if (alertLock.value) return;
+				alertLock.value = true;
+				os.alert({
+					type: 'error',
+					text: err.toString(),
+				}).finally(() => {
+					alertLock.value = false;
+				});
+			},
+		},
+	);
+
+	scannerInstance.value.start()
+		.then(async () => {
+			qrStarted.value = true;
+			if (!scannerInstance.value) return;
+			flashCanToggle.value = await scannerInstance.value.hasFlash();
+			flash.value = scannerInstance.value.isFlashOn();
+		})
+		.catch(err => {
+			qrStarted.value = false;
+			os.alert({
+				type: 'error',
+				text: err.toString(),
+			});
+			console.error(err);
+		});
+});
+
+onUnmounted(() => {
+	if (timer.value) {
+		window.clearTimeout(timer.value);
+		timer.value = null;
+	}
+
+	scannerInstance.value?.destroy();
+});
+</script>
+
+<style lang="scss" module>
+.root {
+	position: relative;
+}
+
+.view {
+	position: sticky;
+	top: var(--MI-stickyTop, 0);
+	z-index: 1;
+	background: var(--MI_THEME-bg);
+	background-size: 16px 16px;
+	width: 100%;
+	height: var(--MI-QrReadVideoHeight);
+}
+
+.video {
+	width: 100%;
+	height: 100%;
+	object-fit: contain;
+}
+
+.controls {
+	width: 100%;
+	position: absolute;
+	right: 10px;
+	bottom: 10px;
+	display: flex;
+	justify-content: end;
+	align-items: center;
+	gap: 10px;
+}
+
+html[data-color-scheme=dark] .view {
+	--c: rgb(255 255 255 / 2%);
+	background-image: linear-gradient(45deg, var(--c) 16.67%, var(--MI_THEME-bg) 16.67%, var(--MI_THEME-bg) 50%, var(--c) 50%, var(--c) 66.67%, var(--MI_THEME-bg) 66.67%, var(--MI_THEME-bg) 100%);
+}
+
+html[data-color-scheme=light] .view {
+	--c: rgb(0 0 0 / 2%);
+	background-image: linear-gradient(45deg, var(--c) 16.67%, var(--MI_THEME-bg) 16.67%, var(--MI_THEME-bg) 50%, var(--c) 50%, var(--c) 66.67%, var(--MI_THEME-bg) 66.67%, var(--MI_THEME-bg) 100%);
+}
+
+.contents {
+	padding-top: calc(var(--MI-margin) / 2);
+}
+
+.tab {
+	padding: calc(var(--MI-margin) / 2) 0;
+	background: var(--MI_THEME-bg);
+}
+
+.users {
+	display: grid;
+	grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
+	grid-gap: var(--MI-margin);
+}
+
+.note {
+	background: var(--MI_THEME-panel);
+	border-radius: var(--MI-radius);
+}
+</style>
diff --git a/packages/frontend/src/pages/qr.show.vue b/packages/frontend/src/pages/qr.show.vue
new file mode 100644
index 0000000000..28f80e0963
--- /dev/null
+++ b/packages/frontend/src/pages/qr.show.vue
@@ -0,0 +1,234 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div :class="$style.root">
+	<div :class="[$style.content]">
+		<div
+			ref="qrCodeEl" v-flip :style="{
+				'cursor': canShare ? 'pointer' : 'default',
+			}"
+			:class="$style.qr" @click="share"
+		></div>
+		<div v-flip :class="$style.user">
+			<MkAvatar :class="$style.avatar" :user="$i" :indicator="false"/>
+			<div>
+				<div :class="$style.name"><MkCondensedLine :minScale="2 / 3"><MkUserName :user="$i" :nowrap="true"/></MkCondensedLine></div>
+				<div><MkCondensedLine :minScale="2 / 3">{{ acct }}</MkCondensedLine></div>
+			</div>
+		</div>
+		<img v-if="deviceMotionPermissionNeeded" v-flip :class="$style.logo" :src="misskeysvg" alt="Misskey Logo" @click="requestDeviceMotion"/>
+		<img v-else v-flip :class="$style.logo" :src="misskeysvg" alt="Misskey Logo"/>
+	</div>
+</div>
+</template>
+
+<script lang="ts" setup>
+import tinycolor from 'tinycolor2';
+import QRCodeStyling from 'qr-code-styling';
+import { computed, ref, shallowRef, watch, onMounted, onUnmounted, useTemplateRef } from 'vue';
+import { url, host } from '@@/js/config.js';
+import type { Directive } from 'vue';
+import { instance } from '@/instance.js';
+import { ensureSignin } from '@/i.js';
+import { userPage, userName } from '@/filters/user.js';
+import misskeysvg from '/client-assets/misskey.svg';
+import { getStaticImageUrl } from '@/utility/media-proxy.js';
+import { i18n } from '@/i18n.js';
+
+const $i = ensureSignin();
+
+const acct = computed(() => `@${$i.username}@${host}`);
+const userProfileUrl = computed(() => userPage($i, undefined, true));
+const shareData = computed(() => ({
+	title: i18n.tsx._qr.shareTitle({ name: userName($i), acct: acct.value }),
+	text: i18n.ts._qr.shareText,
+	url: userProfileUrl.value,
+}));
+const canShare = computed(() => navigator.canShare && navigator.canShare(shareData.value));
+
+const qrCodeEl = useTemplateRef('qrCodeEl');
+
+const qrColor = computed(() => tinycolor(instance.themeColor ?? '#86b300'));
+const qrHsl = computed(() => qrColor.value.toHsl());
+
+function share() {
+	if (!canShare.value) return;
+	return navigator.share(shareData.value);
+}
+
+const qrCodeInstance = new QRCodeStyling({
+	width: 600,
+	height: 600,
+	margin: 42,
+	type: 'canvas',
+	data: `${url}/users/${$i.id}`,
+	image: instance.iconUrl ? getStaticImageUrl(instance.iconUrl) : '/favicon.ico',
+	qrOptions: {
+		typeNumber: 0,
+		mode: 'Byte',
+		errorCorrectionLevel: 'H',
+	},
+	imageOptions: {
+		hideBackgroundDots: true,
+		imageSize: 0.3,
+		margin: 16,
+		crossOrigin: 'anonymous',
+	},
+	dotsOptions: {
+		type: 'dots',
+		color: tinycolor(`hsl(${qrHsl.value.h}, 100, 18)`).toRgbString(),
+	},
+	cornersDotOptions: {
+		type: 'dot',
+	},
+	cornersSquareOptions: {
+		type: 'extra-rounded',
+	},
+	backgroundOptions: {
+		color: tinycolor(`hsl(${qrHsl.value.h}, 100, 97)`).toRgbString(),
+	},
+});
+
+onMounted(() => {
+	if (qrCodeEl.value != null) {
+		qrCodeInstance.append(qrCodeEl.value);
+	}
+});
+
+//#region flip
+const THRESHOLD = -3;
+// @ts-expect-error TS(2339)
+const deviceMotionPermissionNeeded = window.DeviceMotionEvent && typeof window.DeviceMotionEvent.requestPermission === 'function';
+const flipEls: Set<Element> = new Set();
+const flip = ref(false);
+
+function handleOrientationChange(event: DeviceOrientationEvent) {
+	const isUpsideDown = event.beta ? event.beta < THRESHOLD : false;
+	flip.value = isUpsideDown;
+}
+
+watch(flip, (newState) => {
+	flipEls.forEach(el => {
+		el.classList.toggle('_qrShowFlipFliped', newState);
+	});
+});
+
+function requestDeviceMotion() {
+	if (!deviceMotionPermissionNeeded) return;
+	// @ts-expect-error TS(2339)
+	window.DeviceMotionEvent.requestPermission()
+		.then((response: string) => {
+			if (response === 'granted') {
+				window.addEventListener('deviceorientation', handleOrientationChange);
+			}
+		})
+		.catch(console.error);
+}
+
+onMounted(() => {
+	window.addEventListener('deviceorientation', handleOrientationChange);
+});
+
+onUnmounted(() => {
+	window.removeEventListener('deviceorientation', handleOrientationChange);
+});
+
+const vFlip = {
+	mounted(el: Element) {
+		flipEls.add(el);
+		el.classList.add('_qrShowFlip');
+	},
+	unmounted(el: Element) {
+		el.classList.remove('_qrShowFlip');
+		flipEls.delete(el);
+	},
+} as Directive;
+//#endregion
+</script>
+
+<style lang="scss" module>
+$s1: 14px;
+$s2: 21px;
+$s3: 28px;
+$avatarSize: 58px;
+
+.root {
+	position: relative;
+	flex: 1;
+	display: flex;
+	flex-direction: column;
+	justify-content: center;
+}
+
+.content {
+	display: flex;
+	flex-direction: column;
+	align-items: center;
+}
+
+.qr {
+	position: relative;
+	margin: 0 auto;
+	width: 100%;
+	max-width: 230px;
+	border-radius: 12px;
+	overflow: clip;
+	aspect-ratio: 1;
+
+	> svg,
+	> canvas {
+		position: absolute;
+		top: 0;
+		left: 0;
+		width: 100%;
+		height: 100%;
+	}
+}
+
+.user {
+	display: flex;
+	flex-direction: column;
+	margin: $s3 auto;
+	justify-content: center;
+	align-items: center;
+	text-align: center;
+	overflow: visible;
+	width: fit-content;
+	max-width: 100%;
+}
+
+.avatar {
+	width: $avatarSize;
+	height: $avatarSize;
+	margin-bottom: 16px;
+}
+
+.name {
+	font-weight: bold;
+	font-size: 110%;
+}
+
+.logo {
+	width: 100px;
+	margin: $s3 auto 0;
+	filter: drop-shadow(0 0 6px #0007);
+}
+</style>
+
+<style lang="scss">
+/*
+ * useCssModuleで$styleを読み込みたかったが、rollupでのunwindが壊れてしまうらしく失敗。
+ * グローバルにクラスを定義することでお茶を濁す。
+ */
+._qrShowFlip {
+	transition: rotate .3s linear, scale .3s .15s step-start;
+}
+
+._qrShowFlipFliped {
+	scale: -1 1;
+  rotate: x 180deg;
+}
+</style>
diff --git a/packages/frontend/src/pages/qr.vue b/packages/frontend/src/pages/qr.vue
new file mode 100644
index 0000000000..2e5629f232
--- /dev/null
+++ b/packages/frontend/src/pages/qr.vue
@@ -0,0 +1,57 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div :class="$style.root" class="_pageScrollable">
+	<div class="_spacer" :class="$style.main">
+		<MkButton v-if="read" :class="$style.button" rounded @click="read = false"><i class="ti ti-qrcode"></i> {{ i18n.ts._qr.showTabTitle }}</MkButton>
+		<MkButton v-else :class="$style.button" rounded @click="read = true"><i class="ti ti-scan"></i> {{ i18n.ts._qr.readTabTitle }}</MkButton>
+
+		<MkQrRead v-if="read"/>
+		<MkQrShow v-else/>
+	</div>
+	<MkPolkadots v-if="!read" accented revered :height="200" style="position: sticky; bottom: 0; margin-top: -200px;"/>
+</div>
+</template>
+
+<script lang="ts" setup>
+import { defineAsyncComponent, ref, shallowRef } from 'vue';
+import MkQrShow from './qr.show.vue';
+import { definePage } from '@/page.js';
+import { i18n } from '@/i18n.js';
+import { ensureSignin } from '@/i';
+import MkButton from '@/components/MkButton.vue';
+import MkPolkadots from '@/components/MkPolkadots.vue';
+
+// router definitionでloginRequiredが設定されているためエラーハンドリングしない
+const $i = ensureSignin();
+
+const read = ref(false);
+
+const MkQrRead = defineAsyncComponent(() => import('./qr.read.vue'));
+
+definePage(() => ({
+	title: i18n.ts.qr,
+	icon: 'ti ti-qrcode',
+}));
+</script>
+
+<style lang="scss" module>
+.root {
+	height: 100%;
+}
+
+.main {
+	min-height: 100%;
+	display: flex;
+	flex-direction: column;
+	position: relative;
+	z-index: 1;
+}
+
+.button {
+	margin: 0 auto 16px auto;
+}
+</style>
diff --git a/packages/frontend/src/pages/settings/drive.vue b/packages/frontend/src/pages/settings/drive.vue
index cfa4df18fc..2d794f2e30 100644
--- a/packages/frontend/src/pages/settings/drive.vue
+++ b/packages/frontend/src/pages/settings/drive.vue
@@ -48,7 +48,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 						<FormLink @click="chooseUploadFolder()">
 							<SearchLabel>{{ i18n.ts.uploadFolder }}</SearchLabel>
 							<template #suffix>{{ uploadFolder ? uploadFolder.name : '-' }}</template>
-							<template #suffixIcon><i class="ti ti-folder"></i></template>
+							<template #icon><i class="ti ti-folder"></i></template>
 						</FormLink>
 					</SearchMarker>
 
diff --git a/packages/frontend/src/pages/settings/profile.vue b/packages/frontend/src/pages/settings/profile.vue
index 17e8505474..89325dee63 100644
--- a/packages/frontend/src/pages/settings/profile.vue
+++ b/packages/frontend/src/pages/settings/profile.vue
@@ -151,6 +151,15 @@ SPDX-License-Identifier: AGPL-3.0-only
 				</div>
 			</MkFolder>
 		</SearchMarker>
+
+		<hr>
+
+		<SearchMarker :keywords="['qrcode']">
+			<FormLink to="/qr">
+				<template #icon><i class="ti ti-qrcode"></i></template>
+				<SearchLabel>{{ i18n.ts.qr }}</SearchLabel>
+			</FormLink>
+		</SearchMarker>
 	</div>
 </SearchMarker>
 </template>
@@ -164,6 +173,7 @@ import MkSelect from '@/components/MkSelect.vue';
 import FormSplit from '@/components/form/split.vue';
 import MkFolder from '@/components/MkFolder.vue';
 import FormSlot from '@/components/form/slot.vue';
+import FormLink from '@/components/form/link.vue';
 import { chooseDriveFile } from '@/utility/drive.js';
 import * as os from '@/os.js';
 import { i18n } from '@/i18n.js';
diff --git a/packages/frontend/src/router.definition.ts b/packages/frontend/src/router.definition.ts
index e25e0fe161..d59c9d1c6f 100644
--- a/packages/frontend/src/router.definition.ts
+++ b/packages/frontend/src/router.definition.ts
@@ -591,6 +591,10 @@ export const ROUTE_DEF = [{
 	component: page(() => import('@/pages/reversi/game.vue')),
 	loginRequired: false,
 }, {
+	path: '/qr',
+	component: page(() => import('@/pages/qr.vue')),
+	loginRequired: true,
+}, {
 	path: '/debug',
 	component: page(() => import('@/pages/debug.vue')),
 	loginRequired: false,
diff --git a/packages/frontend/src/utility/get-user-menu.ts b/packages/frontend/src/utility/get-user-menu.ts
index 1ec322b5fd..fc1e9f209e 100644
--- a/packages/frontend/src/utility/get-user-menu.ts
+++ b/packages/frontend/src/utility/get-user-menu.ts
@@ -215,6 +215,16 @@ export function getUserMenu(user: Misskey.entities.UserDetailed, router: Router
 		});
 	}
 
+	if ($i && meId === user.id) {
+		menuItems.push({
+			icon: 'ti ti-qrcode',
+			text: i18n.ts.qr,
+			action: () => {
+				router.push('/qr');
+			},
+		});
+	}
+
 	if (notesSearchAvailable && (user.host == null || canSearchNonLocalNotes)) {
 		menuItems.push({
 			icon: 'ti ti-search',
diff --git a/packages/frontend/src/utility/image-effector/ImageEffector.ts b/packages/frontend/src/utility/image-effector/ImageEffector.ts
index 66b4d1026c..26c74bfae5 100644
--- a/packages/frontend/src/utility/image-effector/ImageEffector.ts
+++ b/packages/frontend/src/utility/image-effector/ImageEffector.ts
@@ -3,8 +3,11 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
+import QRCodeStyling from 'qr-code-styling';
+import { url, host } from '@@/js/config.js';
 import { getProxiedImageUrl } from '../media-proxy.js';
 import { initShaderProgram } from '../webgl.js';
+import { ensureSignin } from '@/i.js';
 
 export type ImageEffectorRGB = [r: number, g: number, b: number];
 
@@ -48,6 +51,7 @@ interface AlignParamDef extends CommonParamDef {
 	default: {
 		x: 'left' | 'center' | 'right';
 		y: 'top' | 'center' | 'bottom';
+		margin?: number;
 	};
 };
 
@@ -58,7 +62,13 @@ interface SeedParamDef extends CommonParamDef {
 
 interface TextureParamDef extends CommonParamDef {
 	type: 'texture';
-	default: { type: 'text'; text: string | null; } | { type: 'url'; url: string | null; } | null;
+	default: {
+		type: 'text'; text: string | null;
+	} | {
+		type: 'url'; url: string | null;
+	} | {
+		type: 'qr'; data: string | null;
+	} | null;
 };
 
 interface ColorParamDef extends CommonParamDef {
@@ -324,7 +334,11 @@ export class ImageEffector<IEX extends ReadonlyArray<ImageEffectorFx<any, any, a
 
 				if (_DEV_) console.log(`Baking texture of <${textureKey}>...`);
 
-				const texture = v.type === 'text' ? await createTextureFromText(this.gl, v.text) : v.type === 'url' ? await createTextureFromUrl(this.gl, v.url) : null;
+				const texture =
+					v.type === 'text' ? await createTextureFromText(this.gl, v.text) :
+					v.type === 'url' ? await createTextureFromUrl(this.gl, v.url) :
+					v.type === 'qr' ? await createTextureFromQr(this.gl, { data: v.data }) :
+					null;
 				if (texture == null) continue;
 
 				this.paramTextures.set(textureKey, texture);
@@ -352,7 +366,12 @@ export class ImageEffector<IEX extends ReadonlyArray<ImageEffectorFx<any, any, a
 
 	private getTextureKeyForParam(v: ParamTypeToPrimitive['texture']) {
 		if (v == null) return '';
-		return v.type === 'text' ? `text:${v.text}` : v.type === 'url' ? `url:${v.url}` : '';
+		return (
+			v.type === 'text' ? `text:${v.text}` :
+			v.type === 'url' ? `url:${v.url}` :
+			v.type === 'qr' ? `qr:${v.data}` :
+			''
+		);
 	}
 
 	/*
@@ -467,3 +486,53 @@ async function createTextureFromText(gl: WebGL2RenderingContext, text: string |
 
 	return info;
 }
+
+async function createTextureFromQr(gl: WebGL2RenderingContext, options: { data: string | null }, resolution = 512): Promise<{ texture: WebGLTexture, width: number, height: number } | null> {
+	const $i = ensureSignin();
+
+	const qrCodeInstance = new QRCodeStyling({
+		width: resolution,
+		height: resolution,
+		margin: 42,
+		type: 'canvas',
+		data: options.data == null || options.data === '' ? `${url}/users/${$i.id}` : options.data,
+		image: $i.avatarUrl,
+		qrOptions: {
+			typeNumber: 0,
+			mode: 'Byte',
+			errorCorrectionLevel: 'H',
+		},
+		imageOptions: {
+			hideBackgroundDots: true,
+			imageSize: 0.3,
+			margin: 16,
+			crossOrigin: 'anonymous',
+		},
+		dotsOptions: {
+			type: 'dots',
+		},
+		cornersDotOptions: {
+			type: 'dot',
+		},
+		cornersSquareOptions: {
+			type: 'extra-rounded',
+		},
+	});
+
+	const blob = await qrCodeInstance.getRawData('png') as Blob | null;
+	if (blob == null) return null;
+
+	const image = await window.createImageBitmap(blob);
+
+	const texture = createTexture(gl);
+	gl.activeTexture(gl.TEXTURE0);
+	gl.bindTexture(gl.TEXTURE_2D, texture);
+	gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, resolution, resolution, 0, gl.RGBA, gl.UNSIGNED_BYTE, image);
+	gl.bindTexture(gl.TEXTURE_2D, null);
+
+	return {
+		texture,
+		width: resolution,
+		height: resolution,
+	};
+}
diff --git a/packages/frontend/src/utility/image-effector/fxs/watermarkPlacement.ts b/packages/frontend/src/utility/image-effector/fxs/watermarkPlacement.ts
index 9b79e2bf94..f79acb44b0 100644
--- a/packages/frontend/src/utility/image-effector/fxs/watermarkPlacement.ts
+++ b/packages/frontend/src/utility/image-effector/fxs/watermarkPlacement.ts
@@ -23,6 +23,7 @@ uniform float u_opacity;
 uniform bool u_repeat;
 uniform int u_alignX; // 0: left, 1: center, 2: right
 uniform int u_alignY; // 0: top, 1: center, 2: bottom
+uniform float u_alignMargin;
 uniform int u_fitMode; // 0: contain, 1: cover
 out vec4 out_color;
 
@@ -51,6 +52,9 @@ void main() {
 	float x_offset = u_alignX == 0 ? x_scale / 2.0 : u_alignX == 2 ? 1.0 - (x_scale / 2.0) : 0.5;
 	float y_offset = u_alignY == 0 ? y_scale / 2.0 : u_alignY == 2 ? 1.0 - (y_scale / 2.0) : 0.5;
 
+	x_offset += (u_alignX == 0 ? 1.0 : u_alignX == 2 ? -1.0 : 0.0) * u_alignMargin;
+	y_offset += (u_alignY == 0 ? 1.0 : u_alignY == 2 ? -1.0 : 0.0) * u_alignMargin;
+
 	float angle = -(u_angle * PI);
 	vec2 center = vec2(x_offset, y_offset);
 	//vec2 centeredUv = (in_uv - center) * vec2(in_x_ratio, in_y_ratio);
@@ -86,7 +90,7 @@ export const FX_watermarkPlacement = defineImageEffectorFx({
 	id: 'watermarkPlacement',
 	name: '(internal)',
 	shader,
-	uniforms: ['texture_watermark', 'resolution_watermark', 'scale', 'angle', 'opacity', 'repeat', 'alignX', 'alignY', 'fitMode'] as const,
+	uniforms: ['texture_watermark', 'resolution_watermark', 'scale', 'angle', 'opacity', 'repeat', 'alignX', 'alignY', 'alignMargin', 'fitMode'] as const,
 	params: {
 		cover: {
 			type: 'boolean',
@@ -112,7 +116,7 @@ export const FX_watermarkPlacement = defineImageEffectorFx({
 		},
 		align: {
 			type: 'align',
-			default: { x: 'right', y: 'bottom' },
+			default: { x: 'right', y: 'bottom', margin: 0 },
 		},
 		opacity: {
 			type: 'number',
@@ -143,6 +147,7 @@ export const FX_watermarkPlacement = defineImageEffectorFx({
 		gl.uniform1i(u.repeat, params.repeat ? 1 : 0);
 		gl.uniform1i(u.alignX, params.align.x === 'left' ? 0 : params.align.x === 'right' ? 2 : 1);
 		gl.uniform1i(u.alignY, params.align.y === 'top' ? 0 : params.align.y === 'bottom' ? 2 : 1);
+		gl.uniform1f(u.alignMargin, params.align.margin ?? 0);
 		gl.uniform1i(u.fitMode, params.cover ? 1 : 0);
 	},
 });
diff --git a/packages/frontend/src/utility/watermark.ts b/packages/frontend/src/utility/watermark.ts
index 75807b30c4..b3525f158f 100644
--- a/packages/frontend/src/utility/watermark.ts
+++ b/packages/frontend/src/utility/watermark.ts
@@ -3,11 +3,11 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
+import type { ImageEffectorFx, ImageEffectorLayer } from '@/utility/image-effector/ImageEffector.js';
 import { FX_watermarkPlacement } from '@/utility/image-effector/fxs/watermarkPlacement.js';
 import { FX_stripe } from '@/utility/image-effector/fxs/stripe.js';
 import { FX_polkadot } from '@/utility/image-effector/fxs/polkadot.js';
 import { FX_checker } from '@/utility/image-effector/fxs/checker.js';
-import type { ImageEffectorFx, ImageEffectorLayer } from '@/utility/image-effector/ImageEffector.js';
 import { ImageEffector } from '@/utility/image-effector/ImageEffector.js';
 
 const WATERMARK_FXS = [
@@ -17,6 +17,8 @@ const WATERMARK_FXS = [
 	FX_checker,
 ] as const satisfies ImageEffectorFx<string, any>[];
 
+type Align = { x: 'left' | 'center' | 'right'; y: 'top' | 'center' | 'bottom'; margin?: number; };
+
 export type WatermarkPreset = {
 	id: string;
 	name: string;
@@ -27,7 +29,7 @@ export type WatermarkPreset = {
 		repeat: boolean;
 		scale: number;
 		angle: number;
-		align: { x: 'left' | 'center' | 'right'; y: 'top' | 'center' | 'bottom' };
+		align: Align;
 		opacity: number;
 	} | {
 		id: string;
@@ -38,7 +40,14 @@ export type WatermarkPreset = {
 		repeat: boolean;
 		scale: number;
 		angle: number;
-		align: { x: 'left' | 'center' | 'right'; y: 'top' | 'center' | 'bottom' };
+		align: Align;
+		opacity: number;
+	} | {
+		id: string;
+		type: 'qr';
+		data: string;
+		scale: number;
+		align: Align;
 		opacity: number;
 	} | {
 		id: string;
@@ -125,6 +134,23 @@ export class WatermarkRenderer {
 						},
 					},
 				};
+			} else if (layer.type === 'qr') {
+				return {
+					fxId: 'watermarkPlacement',
+					id: layer.id,
+					params: {
+						repeat: false,
+						scale: layer.scale,
+						align: layer.align,
+						angle: 0,
+						opacity: layer.opacity,
+						cover: false,
+						watermark: {
+							type: 'qr',
+							data: layer.data,
+						},
+					},
+				};
 			} else if (layer.type === 'stripe') {
 				return {
 					fxId: 'stripe',
@@ -164,7 +190,7 @@ export class WatermarkRenderer {
 					},
 				};
 			} else {
-				throw new Error(`Unknown layer type`);
+				throw new Error(`Unrecognized layer type: ${(layer as any).type}`);
 			}
 		});
 	}