diff --git a/locales/index.d.ts b/locales/index.d.ts
index 459733710c..4b99c7f862 100644
--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@@ -12066,6 +12066,12 @@ export interface Locale extends ILocale {
          */
         "image": string;
     };
+    "_imageEffector": {
+        /**
+         * エフェクト
+         */
+        "title": string;
+    };
 }
 declare const locales: {
     [lang: string]: Locale;
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 041c7e22e0..a243c72792 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -3231,3 +3231,6 @@ _watermarkEditor:
   position: "位置"
   type: "タイプ"
   image: "画像"
+
+_imageEffector:
+  title: "エフェクト"
diff --git a/packages/frontend/src/components/MkImageEffectorDialog.Layer.vue b/packages/frontend/src/components/MkImageEffectorDialog.Layer.vue
new file mode 100644
index 0000000000..18056f309f
--- /dev/null
+++ b/packages/frontend/src/components/MkImageEffectorDialog.Layer.vue
@@ -0,0 +1,147 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div :class="$style.root" class="_gaps">
+	<template v-if="layer.type === 'text'">
+		<MkInput v-model="layer.text">
+			<template #label>{{ i18n.ts._watermarkEditor.text }}</template>
+		</MkInput>
+
+		<FormSlot>
+			<template #label>{{ i18n.ts._watermarkEditor.position }}</template>
+			<MkPositionSelector
+				v-model:x="layer.alignX"
+				v-model:y="layer.alignY"
+			></MkPositionSelector>
+		</FormSlot>
+
+		<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>
+
+		<MkSwitch v-model="layer.repeat">
+			<template #label>{{ i18n.ts._watermarkEditor.repeat }}</template>
+		</MkSwitch>
+	</template>
+	<template v-else-if="layer.type === 'image'">
+		<MkButton inline rounded primary @click="chooseFile">{{ i18n.ts.selectFile }}</MkButton>
+
+		<FormSlot>
+			<template #label>{{ i18n.ts._watermarkEditor.position }}</template>
+			<MkPositionSelector
+				v-model:x="layer.alignX"
+				v-model:y="layer.alignY"
+			></MkPositionSelector>
+		</FormSlot>
+
+		<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>
+
+		<MkSwitch v-model="layer.repeat">
+			<template #label>{{ i18n.ts._watermarkEditor.repeat }}</template>
+		</MkSwitch>
+
+		<MkSwitch v-model="layer.cover">
+			<template #label>{{ i18n.ts._watermarkEditor.cover }}</template>
+		</MkSwitch>
+	</template>
+</div>
+</template>
+
+<script setup lang="ts">
+import { ref, useTemplateRef, watch, onMounted, onUnmounted } from 'vue';
+import { v4 as uuid } from 'uuid';
+import type { ImageEffectorLayer } from '@/utility/image-effector/ImageEffector.js';
+import { i18n } from '@/i18n.js';
+import { ImageEffector } from '@/utility/image-effector/ImageEffector.js';
+import MkSelect from '@/components/MkSelect.vue';
+import MkButton from '@/components/MkButton.vue';
+import MkInput from '@/components/MkInput.vue';
+import MkSwitch from '@/components/MkSwitch.vue';
+import MkRange from '@/components/MkRange.vue';
+import FormSlot from '@/components/form/slot.vue';
+import MkPositionSelector from '@/components/MkPositionSelector.vue';
+import * as os from '@/os.js';
+import { selectFile } from '@/utility/drive.js';
+import { misskeyApi } from '@/utility/misskey-api.js';
+import { prefer } from '@/preferences.js';
+
+const layer = defineModel<ImageEffectorLayer>('layer', { required: true });
+
+const driveFile = ref();
+const driveFileError = ref(false);
+onMounted(async () => {
+	if (layer.value.type === 'image' && layer.value.imageId != null) {
+		await misskeyApi('drive/files/show', {
+			fileId: layer.value.imageId,
+		}).then((res) => {
+			driveFile.value = res;
+		}).catch((err) => {
+			driveFileError.value = true;
+		});
+	}
+});
+
+function chooseFile(ev: MouseEvent) {
+	selectFile(ev.currentTarget ?? ev.target, i18n.ts.selectFile).then((file) => {
+		if (!file.type.startsWith('image')) {
+			os.alert({
+				type: 'warning',
+				title: i18n.ts._watermarkEditor.driveFileTypeWarn,
+				text: i18n.ts._watermarkEditor.driveFileTypeWarnDescription,
+			});
+			return;
+		}
+
+		layer.value.imageId = file.id;
+		layer.value.imageUrl = file.url;
+		driveFileError.value = false;
+	});
+}
+</script>
+
+<style module>
+.root {
+
+}
+</style>
diff --git a/packages/frontend/src/components/MkImageEffectorDialog.vue b/packages/frontend/src/components/MkImageEffectorDialog.vue
new file mode 100644
index 0000000000..485c60c641
--- /dev/null
+++ b/packages/frontend/src/components/MkImageEffectorDialog.vue
@@ -0,0 +1,200 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<MkModalWindow
+	ref="dialog"
+	:width="1000"
+	:height="600"
+	:scroll="false"
+	:withOkButton="true"
+	@close="cancel()"
+	@ok="save()"
+	@closed="emit('closed')"
+>
+	<template #header><i class="ti ti-sparkles"></i> {{ i18n.ts._imageEffector.title }}</template>
+
+	<div :class="$style.root">
+		<div :class="$style.container">
+			<div :class="$style.preview">
+				<canvas ref="canvasEl" :class="$style.previewCanvas"></canvas>
+				<div :class="$style.previewContainer">
+					<div class="_acrylic" :class="$style.previewTitle">{{ i18n.ts.preview }}</div>
+					<div class="_acrylic" :class="$style.previewControls">
+					</div>
+				</div>
+			</div>
+			<div :class="$style.controls" class="_gaps">
+				<XLayer
+					v-for="(layer, i) in layers"
+					:key="layer.id"
+					v-model:layer="layers[i]"
+				></XLayer>
+
+				<MkButton rounded primary @click="addEffect"><i class="ti ti-plus"></i></MkButton>
+			</div>
+		</div>
+	</div>
+</MkModalWindow>
+</template>
+
+<script setup lang="ts">
+import { ref, useTemplateRef, watch, onMounted, onUnmounted, reactive } from 'vue';
+import { v4 as uuid } from 'uuid';
+import type { WatermarkPreset } from '@/utility/watermark.js';
+import type { ImageEffectorLayer } from '@/utility/image-effector/ImageEffector.js';
+import { i18n } from '@/i18n.js';
+import { ImageEffector } from '@/utility/image-effector/ImageEffector.js';
+import MkModalWindow from '@/components/MkModalWindow.vue';
+import MkSelect from '@/components/MkSelect.vue';
+import MkButton from '@/components/MkButton.vue';
+import MkInput from '@/components/MkInput.vue';
+import XLayer from '@/components/MkWatermarkEditorDialog.Layer.vue';
+import * as os from '@/os.js';
+import { deepClone } from '@/utility/clone.js';
+
+const props = defineProps<{
+	image: HTMLImageElement;
+}>();
+
+const emit = defineEmits<{
+	(ev: 'ok', preset: WatermarkPreset): void;
+	(ev: 'cancel'): void;
+	(ev: 'closed'): void;
+}>();
+
+const dialog = useTemplateRef('dialog');
+
+function cancel() {
+	emit('cancel');
+	dialog.value?.close();
+}
+
+const layers = reactive<ImageEffectorLayer[]>([]);
+
+watch(layers, async () => {
+	if (renderer != null) {
+		renderer.updateLayers(layers);
+	}
+}, { deep: true });
+
+function addEffect(ev: MouseEvent) {
+
+}
+
+const canvasEl = useTemplateRef('canvasEl');
+
+let renderer: ImageEffector | null = null;
+
+onMounted(async () => {
+	renderer = new ImageEffector({
+		canvas: canvasEl.value,
+		width: props.image.width,
+		height: props.image.height,
+		layers: layers,
+		originalImage: props.image,
+	});
+
+	await renderer!.bakeTextures();
+
+	renderer!.render();
+});
+
+onUnmounted(() => {
+	if (renderer != null) {
+		renderer.destroy();
+		renderer = null;
+	}
+});
+</script>
+
+<style module>
+.root {
+	container-type: inline-size;
+	height: 100%;
+}
+
+.container {
+	height: 100%;
+	display: grid;
+	grid-template-columns: 1fr 400px;
+}
+
+.preview {
+	position: relative;
+	background-color: var(--MI_THEME-bg);
+	background-size: auto auto;
+	background-image: repeating-linear-gradient(135deg, transparent, transparent 6px, var(--MI_THEME-panel) 6px, var(--MI_THEME-panel) 12px);
+}
+
+.previewContainer {
+	display: flex;
+	flex-direction: column;
+	height: 100%;
+	user-select: none;
+	-webkit-user-drag: none;
+}
+
+.previewTitle {
+	position: absolute;
+	z-index: 100;
+	top: 8px;
+	left: 8px;
+	padding: 6px 10px;
+	border-radius: 6px;
+	font-size: 85%;
+}
+
+.previewControls {
+	position: absolute;
+	z-index: 100;
+	bottom: 8px;
+	right: 8px;
+	display: flex;
+	align-items: center;
+	gap: 8px;
+	padding: 6px 10px;
+	border-radius: 6px;
+}
+
+.previewControlsButton {
+	&.active {
+		color: var(--MI_THEME-accent);
+	}
+}
+
+.previewSpinner {
+	position: absolute;
+	top: 50%;
+	left: 50%;
+	transform: translate(-50%, -50%);
+	pointer-events: none;
+	user-select: none;
+	-webkit-user-drag: none;
+}
+
+.previewCanvas {
+	position: absolute;
+	top: 0;
+	left: 0;
+	width: 100%;
+	height: 100%;
+	padding: 20px;
+	box-sizing: border-box;
+	object-fit: contain;
+}
+
+.controls {
+	padding: 24px;
+	overflow-y: scroll;
+}
+
+@container (max-width: 800px) {
+	.container {
+		grid-template-columns: 1fr;
+		grid-template-rows: 1fr 1fr;
+	}
+}
+</style>
diff --git a/packages/frontend/src/components/MkUploaderDialog.vue b/packages/frontend/src/components/MkUploaderDialog.vue
index e6ff643293..d4ad0f8c7f 100644
--- a/packages/frontend/src/components/MkUploaderDialog.vue
+++ b/packages/frontend/src/components/MkUploaderDialog.vue
@@ -80,7 +80,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { computed, markRaw, onMounted, onUnmounted, ref, triggerRef, useTemplateRef, watch } from 'vue';
+import { computed, defineAsyncComponent, markRaw, onMounted, onUnmounted, ref, triggerRef, useTemplateRef, watch } from 'vue';
 import * as Misskey from 'misskey-js';
 import { v4 as uuid } from 'uuid';
 import { readAndCompressImage } from '@misskey-dev/browser-image-resizer';
@@ -96,7 +96,8 @@ import { isWebpSupported } from '@/utility/isWebpSupported.js';
 import { uploadFile, UploadAbortedError } from '@/utility/drive.js';
 import * as os from '@/os.js';
 import { ensureSignin } from '@/i.js';
-import { ImageEffector } from '@/utility/ImageEffector.js';
+import { ImageEffector } from '@/utility/image-effector/ImageEffector.js';
+import { makeImageEffectorLayers } from '@/utility/watermark.js';
 
 const $i = ensureSignin();
 
@@ -288,6 +289,23 @@ function showMenu(ev: MouseEvent, item: typeof items.value[0]) {
 		});
 	}
 
+	if (IMAGE_EDITING_SUPPORTED_TYPES.includes(item.file.type) && !item.preprocessing && !item.uploading && !item.uploaded) {
+		menu.push({
+			icon: 'ti ti-sparkles',
+			text: i18n.ts._imageEffector.title,
+			action: async () => {
+				const img = await getImageElement(item.file);
+				const { dispose } = os.popup(defineAsyncComponent(() => import('@/components/MkImageEffectorDialog.vue')), {
+					image: img,
+				}, {
+					ok: () => {
+					},
+					closed: () => dispose(),
+				});
+			},
+		});
+	}
+
 	if (WATERMARK_SUPPORTED_TYPES.includes(item.file.type) && !item.preprocessing && !item.uploading && !item.uploaded) {
 		function changeWatermarkPreset(presetId: string | null) {
 			item.watermarkPresetId = presetId;
@@ -490,7 +508,7 @@ async function preprocess(item: (typeof items)['value'][number]): Promise<void>
 			canvas: canvas,
 			width: img.width,
 			height: img.height,
-			layers: preset.layers,
+			layers: makeImageEffectorLayers(preset.layers),
 			originalImage: img,
 		});
 
diff --git a/packages/frontend/src/components/MkWatermarkEditorDialog.Layer.vue b/packages/frontend/src/components/MkWatermarkEditorDialog.Layer.vue
index 06c36063d8..bf67bbec9a 100644
--- a/packages/frontend/src/components/MkWatermarkEditorDialog.Layer.vue
+++ b/packages/frontend/src/components/MkWatermarkEditorDialog.Layer.vue
@@ -13,8 +13,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<FormSlot>
 			<template #label>{{ i18n.ts._watermarkEditor.position }}</template>
 			<MkPositionSelector
-				v-model:x="layer.alignX"
-				v-model:y="layer.alignY"
+				v-model:x="layer.align.x"
+				v-model:y="layer.align.y"
 			></MkPositionSelector>
 		</FormSlot>
 
@@ -50,8 +50,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<FormSlot>
 			<template #label>{{ i18n.ts._watermarkEditor.position }}</template>
 			<MkPositionSelector
-				v-model:x="layer.alignX"
-				v-model:y="layer.alignY"
+				v-model:x="layer.align.x"
+				v-model:y="layer.align.y"
 			></MkPositionSelector>
 		</FormSlot>
 
@@ -91,9 +91,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 <script setup lang="ts">
 import { ref, useTemplateRef, watch, onMounted, onUnmounted } from 'vue';
 import { v4 as uuid } from 'uuid';
-import type { ImageEffectorLayer } from '@/utility/ImageEffector.js';
+import type { ImageEffectorLayer } from '@/utility/image-effector/ImageEffector.js';
+import type { WatermarkPreset } from '@/utility/watermark.js';
 import { i18n } from '@/i18n.js';
-import { ImageEffector } from '@/utility/ImageEffector.js';
 import MkSelect from '@/components/MkSelect.vue';
 import MkButton from '@/components/MkButton.vue';
 import MkInput from '@/components/MkInput.vue';
@@ -106,7 +106,7 @@ import { selectFile } from '@/utility/drive.js';
 import { misskeyApi } from '@/utility/misskey-api.js';
 import { prefer } from '@/preferences.js';
 
-const layer = defineModel<ImageEffectorLayer>('layer', { required: true });
+const layer = defineModel<WatermarkPreset['layers'][number]>('layer', { required: true });
 
 const driveFile = ref();
 const driveFileError = ref(false);
diff --git a/packages/frontend/src/components/MkWatermarkEditorDialog.vue b/packages/frontend/src/components/MkWatermarkEditorDialog.vue
index 7acb0e8ecd..07fe0c45e2 100644
--- a/packages/frontend/src/components/MkWatermarkEditorDialog.vue
+++ b/packages/frontend/src/components/MkWatermarkEditorDialog.vue
@@ -45,9 +45,10 @@ SPDX-License-Identifier: AGPL-3.0-only
 <script setup lang="ts">
 import { ref, useTemplateRef, watch, onMounted, onUnmounted, reactive } from 'vue';
 import { v4 as uuid } from 'uuid';
-import type { WatermarkPreset } from '@/preferences/def.js';
+import type { WatermarkPreset } from '@/utility/watermark.js';
+import { makeImageEffectorLayers } from '@/utility/watermark.js';
 import { i18n } from '@/i18n.js';
-import { ImageEffector } from '@/utility/ImageEffector.js';
+import { ImageEffector } from '@/utility/image-effector/ImageEffector.js';
 import MkModalWindow from '@/components/MkModalWindow.vue';
 import MkSelect from '@/components/MkSelect.vue';
 import MkButton from '@/components/MkButton.vue';
@@ -70,8 +71,7 @@ const preset = reactive(deepClone(props.preset) ?? {
 		id: uuid(),
 		type: 'text',
 		text: `(c) @${$i.username}`,
-		alignX: 'right',
-		alignY: 'bottom',
+		align: { x: 'right', y: 'bottom' },
 		scale: 0.3,
 		opacity: 0.75,
 		repeat: false,
@@ -96,10 +96,9 @@ watch(type, () => {
 	if (type.value === 'text') {
 		preset.layers = [{
 			id: uuid(),
-			type: type.value,
+			type: 'text',
 			text: `(c) @${$i.username}`,
-			alignX: 'right',
-			alignY: 'bottom',
+			align: { x: 'right', y: 'bottom' },
 			scale: 0.3,
 			opacity: 0.75,
 			repeat: false,
@@ -107,11 +106,10 @@ watch(type, () => {
 	} else if (type.value === 'image') {
 		preset.layers = [{
 			id: uuid(),
-			type: type.value,
+			type: 'image',
 			imageId: null,
 			imageUrl: null,
-			alignX: 'right',
-			alignY: 'bottom',
+			align: { x: 'right', y: 'bottom' },
 			scale: 0.3,
 			opacity: 0.75,
 			repeat: false,
@@ -121,7 +119,7 @@ watch(type, () => {
 
 watch(preset, async (newValue, oldValue) => {
 	if (renderer != null) {
-		renderer.updateLayers(preset.layers);
+		renderer.updateLayers(makeImageEffectorLayers(preset.layers));
 	}
 }, { deep: true });
 
@@ -158,7 +156,7 @@ async function initRenderer() {
 			canvas: canvasEl.value,
 			width: 1500,
 			height: 1000,
-			layers: preset.layers,
+			layers: makeImageEffectorLayers(preset.layers),
 			originalImage: sampleImage_3_2,
 		});
 	} else if (sampleImageType.value === '2_3') {
@@ -166,7 +164,7 @@ async function initRenderer() {
 			canvas: canvasEl.value,
 			width: 1000,
 			height: 1500,
-			layers: preset.layers,
+			layers: makeImageEffectorLayers(preset.layers),
 			originalImage: sampleImage_2_3,
 		});
 	}
diff --git a/packages/frontend/src/pages/settings/drive.WatermarkItem.vue b/packages/frontend/src/pages/settings/drive.WatermarkItem.vue
index a339402e94..85881cb7c6 100644
--- a/packages/frontend/src/pages/settings/drive.WatermarkItem.vue
+++ b/packages/frontend/src/pages/settings/drive.WatermarkItem.vue
@@ -22,13 +22,14 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <script lang="ts" setup>
 import { defineAsyncComponent, onMounted, onUnmounted, ref, useTemplateRef, watch } from 'vue';
-import type { WatermarkPreset } from '@/preferences/def.js';
+import type { WatermarkPreset } from '@/utility/watermark.js';
+import { makeImageEffectorLayers } from '@/utility/watermark.js';
 import MkButton from '@/components/MkButton.vue';
 import * as os from '@/os.js';
 import { i18n } from '@/i18n.js';
 import { deepClone } from '@/utility/clone.js';
 import MkFolder from '@/components/MkFolder.vue';
-import { ImageEffector } from '@/utility/ImageEffector.js';
+import { ImageEffector } from '@/utility/image-effector/ImageEffector.js';
 
 const props = defineProps<{
 	preset: WatermarkPreset;
@@ -75,7 +76,7 @@ onMounted(() => {
 				canvas: canvasEl.value,
 				width: 1500,
 				height: 1000,
-				layers: props.preset.layers,
+				layers: makeImageEffectorLayers(props.preset.layers),
 				originalImage: sampleImage,
 			});
 
@@ -95,7 +96,7 @@ onUnmounted(() => {
 
 watch(() => props.preset, async () => {
 	if (renderer != null) {
-		renderer.updateLayers(props.preset.layers);
+		renderer.updateLayers(makeImageEffectorLayers(props.preset.layers));
 		await renderer.bakeTextures();
 		renderer.render();
 	}
diff --git a/packages/frontend/src/pages/settings/drive.vue b/packages/frontend/src/pages/settings/drive.vue
index a7d829a34c..1b66bf830f 100644
--- a/packages/frontend/src/pages/settings/drive.vue
+++ b/packages/frontend/src/pages/settings/drive.vue
@@ -149,7 +149,7 @@ import { computed, defineAsyncComponent, ref } from 'vue';
 import * as Misskey from 'misskey-js';
 import tinycolor from 'tinycolor2';
 import XWatermarkItem from './drive.WatermarkItem.vue';
-import type { WatermarkPreset } from '@/preferences/def.js';
+import type { WatermarkPreset } from '@/utility/watermark.js';
 import FormLink from '@/components/form/link.vue';
 import MkSwitch from '@/components/MkSwitch.vue';
 import MkSelect from '@/components/MkSelect.vue';
diff --git a/packages/frontend/src/preferences/def.ts b/packages/frontend/src/preferences/def.ts
index 1b06034269..23603e21c8 100644
--- a/packages/frontend/src/preferences/def.ts
+++ b/packages/frontend/src/preferences/def.ts
@@ -11,7 +11,7 @@ import type { Plugin } from '@/plugin.js';
 import type { DeviceKind } from '@/utility/device-kind.js';
 import type { DeckProfile } from '@/deck.js';
 import type { PreferencesDefinition } from './manager.js';
-import type { ImageEffectorLayer } from '@/utility/ImageEffector.js';
+import type { WatermarkPreset } from '@/utility/watermark.js';
 import { DEFAULT_DEVICE_KIND } from '@/utility/device-kind.js';
 
 /** サウンド設定 */
@@ -30,12 +30,6 @@ export type SoundStore = {
 	volume: number;
 };
 
-export type WatermarkPreset = {
-	id: string;
-	name: string;
-	layers: ImageEffectorLayer[];
-};
-
 // NOTE: デフォルト値は他の設定の状態に依存してはならない(依存していた場合、ユーザーがその設定項目単体で「初期値にリセット」した場合不具合の原因になる)
 
 export const PREF_DEF = {
diff --git a/packages/frontend/src/utility/ImageEffector.ts b/packages/frontend/src/utility/image-effector/ImageEffector.ts
similarity index 64%
rename from packages/frontend/src/utility/ImageEffector.ts
rename to packages/frontend/src/utility/image-effector/ImageEffector.ts
index 171bece7d7..076ff816e0 100644
--- a/packages/frontend/src/utility/ImageEffector.ts
+++ b/packages/frontend/src/utility/image-effector/ImageEffector.ts
@@ -3,94 +3,67 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { getProxiedImageUrl } from './media-proxy.js';
+import { getProxiedImageUrl } from '../media-proxy.js';
+import { FX_chromaticAberration } from './fxs/chromaticAberration.js';
+import { FX_watermarkPlacement } from './fxs/watermarkPlacement.js';
 
-const WATERMARK_PLACEMENT_SHADER = `#version 300 es
-precision highp float;
+type ParamTypeToPrimitive = {
+	'number': number;
+	'boolean': boolean;
+	'align': { x: 'left' | 'center' | 'right'; y: 'top' | 'center' | 'bottom'; };
+};
 
-in vec2 in_uv;
-uniform sampler2D u_texture_src;
-uniform sampler2D u_texture_watermark;
-uniform vec2 u_resolution_src;
-uniform vec2 u_resolution_watermark;
-uniform float u_scale;
-uniform float u_angle;
-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 int u_fitMode; // 0: contain, 1: cover
-out vec4 out_color;
+type ImageEffectorFxParamDefs = Record<string, {
+	type: keyof ParamTypeToPrimitive;
+	default: any;
+}>;
 
-void main() {
-	vec4 pixel = texture(u_texture_src, in_uv);
-
-	bool contain = u_fitMode == 0;
-
-	float x_ratio = u_resolution_watermark.x / u_resolution_src.x;
-	float y_ratio = u_resolution_watermark.y / u_resolution_src.y;
-
-	float aspect_ratio = contain ?
-		(min(x_ratio, y_ratio) / max(x_ratio, y_ratio)) :
-		(max(x_ratio, y_ratio) / min(x_ratio, y_ratio));
-
-	float x_scale = contain ?
-		(x_ratio > y_ratio ? 1.0 * u_scale : aspect_ratio * u_scale) :
-		(x_ratio > y_ratio ? aspect_ratio * u_scale : 1.0 * u_scale);
-
-	float y_scale = contain ?
-		(y_ratio > x_ratio ? 1.0 * u_scale : aspect_ratio * u_scale) :
-		(y_ratio > x_ratio ? aspect_ratio * u_scale : 1.0 * u_scale);
-
-	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;
-
-	if (!u_repeat) {
-		bool isInside = in_uv.x > x_offset - (x_scale / 2.0) && in_uv.x < x_offset + (x_scale / 2.0) &&
-										in_uv.y > y_offset - (y_scale / 2.0) && in_uv.y < y_offset + (y_scale / 2.0);
-		if (!isInside) {
-			out_color = pixel;
-			return;
-		}
-	}
-
-	vec4 watermarkPixel = texture(u_texture_watermark, vec2(
-		(in_uv.x - (x_offset - (x_scale / 2.0))) / x_scale,
-		(in_uv.y - (y_offset - (y_scale / 2.0))) / y_scale
-	));
-
-	out_color.r = mix(pixel.r, watermarkPixel.r, u_opacity * watermarkPixel.a);
-	out_color.g = mix(pixel.g, watermarkPixel.g, u_opacity * watermarkPixel.a);
-	out_color.b = mix(pixel.b, watermarkPixel.b, u_opacity * watermarkPixel.a);
-	out_color.a = pixel.a * (1.0 - u_opacity * watermarkPixel.a) + watermarkPixel.a * u_opacity;
+export function defineImageEffectorFx<ID extends string, P extends ImageEffectorFxParamDefs>(fx: ImageEffectorFx<ID, P>) {
+	return fx;
 }
-`;
 
-type ImageEffectorTextLayer = {
-	id: string;
-	type: 'text';
-	text: string;
-	repeat: boolean;
-	scale: number;
-	alignX: 'left' | 'center' | 'right';
-	alignY: 'top' | 'center' | 'bottom';
-	opacity: number;
+export type ImageEffectorFx<ID extends string, P extends ImageEffectorFxParamDefs> = {
+	id: ID;
+	shader: string;
+	params: P,
+	main: (ctx: {
+		gl: WebGL2RenderingContext;
+		program: WebGLProgram;
+		params: {
+			[key in keyof P]: ParamTypeToPrimitive[P[key]['type']];
+		};
+		preTexture: WebGLTexture;
+		width: number;
+		height: number;
+		watermark?: {
+			texture: WebGLTexture;
+			width: number;
+			height: number;
+		};
+	}) => void;
 };
 
-type ImageEffectorImageLayer = {
+const FXS = [
+	FX_watermarkPlacement,
+	FX_chromaticAberration,
+] as const satisfies ImageEffectorFx<string, any>[];
+
+export type ImageEffectorLayerOf<
+	FXID extends (typeof FXS)[number]['id'],
+	FX extends { params: ImageEffectorFxParamDefs } = Extract<(typeof FXS)[number], { id: FXID }>,
+> = {
 	id: string;
-	type: 'image';
-	imageUrl: string | null;
-	imageId: string | null;
-	cover: boolean;
-	repeat: boolean;
-	scale: number;
-	alignX: 'left' | 'center' | 'right';
-	alignY: 'top' | 'center' | 'bottom';
-	opacity: number;
+	fxId: FXID;
+	params: {
+		[key in keyof FX['params']]: ParamTypeToPrimitive[FX['params'][key]['type']];
+	};
+
+	// for watermarkPlacement fx
+	imageUrl?: string | null;
+	text?: string | null;
 };
 
-export type ImageEffectorLayer = ImageEffectorTextLayer | ImageEffectorImageLayer;
+export type ImageEffectorLayer = ImageEffectorLayerOf<(typeof FXS)[number]['id'], Extract<(typeof FXS)[number], { id: (typeof FXS)[number]['id'] }>>;
 
 export class ImageEffector {
 	private canvas: HTMLCanvasElement | null = null;
@@ -104,8 +77,9 @@ export class ImageEffector {
 	private originalImageTexture: WebGLTexture;
 	private resultTexture: WebGLTexture;
 	private resultFrameBuffer: WebGLFramebuffer;
-	private bakedTextures: Map<string, { texture: WebGLTexture; width: number; height: number; }> = new Map();
+	private bakedTexturesForWatermarkFx: Map<string, { texture: WebGLTexture; width: number; height: number; }> = new Map();
 	private texturesKey: string;
+	private shaderCache: Map<string, WebGLProgram> = new Map();
 
 	constructor(options: {
 		canvas: HTMLCanvasElement;
@@ -191,9 +165,9 @@ export class ImageEffector {
 
 	private calcTexturesKey() {
 		return this.layers.map(layer => {
-			if (layer.type === 'image') {
-				return layer.imageId;
-			} else if (layer.type === 'text') {
+			if (layer.fxId === 'watermarkPlacement' && layer.imageUrl != null) {
+				return layer.imageUrl;
+			} else if (layer.fxId === 'watermarkPlacement' && layer.text != null) {
 				return layer.text;
 			}
 			return '';
@@ -218,10 +192,10 @@ export class ImageEffector {
 			throw new Error('gl is not initialized');
 		}
 
-		for (const bakedTexture of this.bakedTextures.values()) {
+		for (const bakedTexture of this.bakedTexturesForWatermarkFx.values()) {
 			gl.deleteTexture(bakedTexture.texture);
 		}
-		this.bakedTextures.clear();
+		this.bakedTexturesForWatermarkFx.clear();
 	}
 
 	public async bakeTextures() {
@@ -235,7 +209,7 @@ export class ImageEffector {
 		this.disposeBakedTextures();
 
 		for (const layer of this.layers) {
-			if (layer.type === 'image') {
+			if (layer.fxId === 'watermarkPlacement' && layer.imageUrl != null) {
 				const image = await new Promise<HTMLImageElement>((resolve, reject) => {
 					const img = new Image();
 					img.onload = () => resolve(img);
@@ -249,12 +223,12 @@ export class ImageEffector {
 				gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, image.width, image.height, 0, gl.RGBA, gl.UNSIGNED_BYTE, image);
 				gl.bindTexture(gl.TEXTURE_2D, null);
 
-				this.bakedTextures.set(layer.id, {
+				this.bakedTexturesForWatermarkFx.set(layer.id, {
 					texture: texture,
 					width: image.width,
 					height: image.height,
 				});
-			} else if (layer.type === 'text') {
+			} else if (layer.fxId === 'watermarkPlacement' && layer.text != null) {
 				const measureCtx = window.document.createElement('canvas').getContext('2d')!;
 				measureCtx.canvas.width = this.renderWidth;
 				measureCtx.canvas.height = this.renderHeight;
@@ -289,7 +263,7 @@ export class ImageEffector {
 				gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, textCtx.canvas.width, textCtx.canvas.height, 0, gl.RGBA, gl.UNSIGNED_BYTE, textCtx.canvas);
 				gl.bindTexture(gl.TEXTURE_2D, null);
 
-				this.bakedTextures.set(layer.id, {
+				this.bakedTexturesForWatermarkFx.set(layer.id, {
 					texture: texture,
 					width: textCtx.canvas.width,
 					height: textCtx.canvas.height,
@@ -342,18 +316,19 @@ export class ImageEffector {
 		return shaderProgram;
 	}
 
-	private renderTextOrImageLayer(layer: ImageEffectorTextLayer | ImageEffectorImageLayer) {
+	private renderLayer(layer: ImageEffectorLayer, preTexture: WebGLTexture) {
 		const gl = this.gl;
 		if (gl == null) {
 			throw new Error('gl is not initialized');
 		}
 
-		const watermarkTexture = this.bakedTextures.get(layer.id);
-		if (watermarkTexture == null) {
-			return;
-		}
+		const fx = FXS.find(fx => fx.id === layer.fxId);
+		if (fx == null) return;
 
-		const shaderProgram = this.initShaderProgram(`#version 300 es
+		const watermark = layer.fxId === 'watermarkPlacement' ? this.bakedTexturesForWatermarkFx.get(layer.id) : undefined;
+
+		const cachedShader = this.shaderCache.get(fx.id);
+		const shaderProgram = cachedShader ?? this.initShaderProgram(`#version 300 es
 			in vec2 position;
 			out vec2 in_uv;
 
@@ -361,58 +336,30 @@ export class ImageEffector {
 				in_uv = (position + 1.0) / 2.0;
 				gl_Position = vec4(position, 0.0, 1.0);
 			}
-		`, WATERMARK_PLACEMENT_SHADER);
+		`, fx.shader);
+		if (cachedShader == null) {
+			this.shaderCache.set(fx.id, shaderProgram);
+		}
 
 		gl.useProgram(shaderProgram);
 
-		gl.activeTexture(gl.TEXTURE0);
-		gl.bindTexture(gl.TEXTURE_2D, this.originalImageTexture);
-		const u_texture_src = gl.getUniformLocation(shaderProgram, 'u_texture_src');
-		gl.uniform1i(u_texture_src, 0);
-
-		gl.activeTexture(gl.TEXTURE1);
-		gl.bindTexture(gl.TEXTURE_2D, watermarkTexture.texture);
-		const u_texture_watermark = gl.getUniformLocation(shaderProgram, 'u_texture_watermark');
-		gl.uniform1i(u_texture_watermark, 1);
-
-		const u_resolution_src = gl.getUniformLocation(shaderProgram, 'u_resolution_src');
-		gl.uniform2fv(u_resolution_src, [this.renderWidth, this.renderHeight]);
-
-		const u_resolution_watermark = gl.getUniformLocation(shaderProgram, 'u_resolution_watermark');
-		gl.uniform2fv(u_resolution_watermark, [watermarkTexture.width, watermarkTexture.height]);
-
-		const u_scale = gl.getUniformLocation(shaderProgram, 'u_scale');
-		gl.uniform1f(u_scale, layer.scale);
-
-		const u_opacity = gl.getUniformLocation(shaderProgram, 'u_opacity');
-		gl.uniform1f(u_opacity, layer.opacity);
-
-		const u_angle = gl.getUniformLocation(shaderProgram, 'u_angle');
-		gl.uniform1f(u_angle, 0.0);
-
-		const u_repeat = gl.getUniformLocation(shaderProgram, 'u_repeat');
-		gl.uniform1i(u_repeat, layer.repeat ? 1 : 0);
-
-		const u_alignX = gl.getUniformLocation(shaderProgram, 'u_alignX');
-		gl.uniform1i(u_alignX, layer.alignX === 'left' ? 0 : layer.alignX === 'right' ? 2 : 1);
-
-		const u_alignY = gl.getUniformLocation(shaderProgram, 'u_alignY');
-		gl.uniform1i(u_alignY, layer.alignY === 'top' ? 0 : layer.alignY === 'bottom' ? 2 : 1);
-
-		const u_fitMode = gl.getUniformLocation(shaderProgram, 'u_fitMode');
-		gl.uniform1i(u_fitMode, layer.cover ? 1 : 0);
+		fx.main({
+			gl: gl,
+			program: shaderProgram,
+			params: Object.fromEntries(
+				Object.entries(fx.params).map(([key, param]) => {
+					return [key, layer.params[key] ?? param.default];
+				}),
+			) as any,
+			preTexture: preTexture,
+			width: this.renderWidth,
+			height: this.renderHeight,
+			watermark: watermark,
+		});
 
 		gl.drawArrays(gl.TRIANGLES, 0, 6);
 	}
 
-	private renderLayer(layer: ImageEffectorLayer) {
-		if (layer.type === 'image') {
-			this.renderTextOrImageLayer(layer);
-		} else if (layer.type === 'text') {
-			this.renderTextOrImageLayer(layer);
-		}
-	}
-
 	public render() {
 		const gl = this.gl;
 		if (gl == null) {
@@ -449,7 +396,7 @@ export class ImageEffector {
 		// --------------------
 
 		for (const layer of this.layers) {
-			this.renderLayer(layer);
+			this.renderLayer(layer, this.originalImageTexture);
 		}
 
 		// --------------------
@@ -481,6 +428,10 @@ export class ImageEffector {
 			throw new Error('gl is not initialized');
 		}
 
+		for (const shader of this.shaderCache.values()) {
+			gl.deleteProgram(shader);
+		}
+
 		this.disposeBakedTextures();
 		gl.deleteProgram(this.renderTextureProgram);
 		gl.deleteProgram(this.renderInvertedTextureProgram);
diff --git a/packages/frontend/src/utility/image-effector/fxs/chromaticAberration.ts b/packages/frontend/src/utility/image-effector/fxs/chromaticAberration.ts
new file mode 100644
index 0000000000..0cf1aed577
--- /dev/null
+++ b/packages/frontend/src/utility/image-effector/fxs/chromaticAberration.ts
@@ -0,0 +1,91 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { defineImageEffectorFx } from '../ImageEffector.js';
+
+const shader = `#version 300 es
+precision highp float;
+
+in vec2 in_uv;
+uniform sampler2D u_texture;
+uniform vec2 u_resolution;
+out vec4 out_color;
+uniform float u_amount;
+uniform float u_start;
+uniform bool u_normalize;
+
+void main() {
+	int samples = 64;
+	float r_strength = 1.0;
+	float g_strength = 1.5;
+	float b_strength = 2.0;
+
+	vec2 size = vec2(u_resolution.x, u_resolution.y);
+
+	vec4 accumulator = vec4(0.0);
+	float normalisedValue = length((in_uv - 0.5) * 2.0);
+	float strength = clamp((normalisedValue - u_start) * (1.0 / (1.0 - u_start)), 0.0, 1.0);
+
+	//vec2 vector = normalize((in_uv - (size / 2.0)) / size);
+	//vec2 vector = in_uv;
+	vec2 vector = (u_normalize ? normalize(in_uv - vec2(0.5)) : in_uv - vec2(0.5));
+	vec2 velocity = vector * strength * u_amount;
+
+	//vec2 rOffset = -vector * strength * (u_amount * 1.0);
+	//vec2 gOffset = -vector * strength * (u_amount * 1.5);
+	//vec2 bOffset = -vector * strength * (u_amount * 2.0);
+
+	//vec2 rOffset = -vector * strength * (u_amount * 0.5);
+	//vec2 gOffset = -vector * strength * (u_amount * 1.0);
+	//vec2 bOffset = -vector * strength * (u_amount * 2.0);
+
+	vec2 rOffset = -vector * strength * (u_amount * r_strength);
+	vec2 gOffset = -vector * strength * (u_amount * g_strength);
+	vec2 bOffset = -vector * strength * (u_amount * b_strength);
+
+	for (int i=0; i < samples; i++) {
+		accumulator.r += texture(u_texture, in_uv + rOffset).r;
+		rOffset -= velocity / float(samples);
+
+		accumulator.g += texture(u_texture, in_uv + gOffset).g;
+		gOffset -= velocity / float(samples);
+
+		accumulator.b += texture(u_texture, in_uv + bOffset).b;
+		bOffset -= velocity / float(samples);
+	}
+
+	out_color = vec4(vec3(accumulator / float(samples)), 1.0);
+}
+`;
+
+export const FX_chromaticAberration = defineImageEffectorFx({
+	id: 'chromaticAberration' as const,
+	shader,
+	params: {
+		normalize: {
+			type: 'boolean' as const,
+			default: false,
+		},
+		amount: {
+			type: 'number' as const,
+			default: 0.1,
+			min: 0.0,
+			max: 1.0,
+			step: 0.01,
+		},
+	},
+	main: ({ gl, program, params, preTexture }) => {
+		gl.activeTexture(gl.TEXTURE0);
+		gl.bindTexture(gl.TEXTURE_2D, preTexture);
+		const u_texture = gl.getUniformLocation(program, 'u_texture');
+		gl.uniform1i(u_texture, 0);
+
+		const u_amount = gl.getUniformLocation(program, 'u_amount');
+		gl.uniform1f(u_amount, params.amount);
+
+		const u_normalize = gl.getUniformLocation(program, 'u_normalize');
+		gl.uniform1i(u_normalize, params.normalize ? 1 : 0);
+	},
+});
diff --git a/packages/frontend/src/utility/image-effector/fxs/watermarkPlacement.ts b/packages/frontend/src/utility/image-effector/fxs/watermarkPlacement.ts
new file mode 100644
index 0000000000..00e3f339a2
--- /dev/null
+++ b/packages/frontend/src/utility/image-effector/fxs/watermarkPlacement.ts
@@ -0,0 +1,142 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { defineImageEffectorFx } from '../ImageEffector.js';
+
+const shader = `#version 300 es
+precision highp float;
+
+in vec2 in_uv;
+uniform sampler2D u_texture_src;
+uniform sampler2D u_texture_watermark;
+uniform vec2 u_resolution_src;
+uniform vec2 u_resolution_watermark;
+uniform float u_scale;
+uniform float u_angle;
+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 int u_fitMode; // 0: contain, 1: cover
+out vec4 out_color;
+
+void main() {
+	vec4 pixel = texture(u_texture_src, in_uv);
+
+	bool contain = u_fitMode == 0;
+
+	float x_ratio = u_resolution_watermark.x / u_resolution_src.x;
+	float y_ratio = u_resolution_watermark.y / u_resolution_src.y;
+
+	float aspect_ratio = contain ?
+		(min(x_ratio, y_ratio) / max(x_ratio, y_ratio)) :
+		(max(x_ratio, y_ratio) / min(x_ratio, y_ratio));
+
+	float x_scale = contain ?
+		(x_ratio > y_ratio ? 1.0 * u_scale : aspect_ratio * u_scale) :
+		(x_ratio > y_ratio ? aspect_ratio * u_scale : 1.0 * u_scale);
+
+	float y_scale = contain ?
+		(y_ratio > x_ratio ? 1.0 * u_scale : aspect_ratio * u_scale) :
+		(y_ratio > x_ratio ? aspect_ratio * u_scale : 1.0 * u_scale);
+
+	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;
+
+	if (!u_repeat) {
+		bool isInside = in_uv.x > x_offset - (x_scale / 2.0) && in_uv.x < x_offset + (x_scale / 2.0) &&
+										in_uv.y > y_offset - (y_scale / 2.0) && in_uv.y < y_offset + (y_scale / 2.0);
+		if (!isInside) {
+			out_color = pixel;
+			return;
+		}
+	}
+
+	vec4 watermarkPixel = texture(u_texture_watermark, vec2(
+		(in_uv.x - (x_offset - (x_scale / 2.0))) / x_scale,
+		(in_uv.y - (y_offset - (y_scale / 2.0))) / y_scale
+	));
+
+	out_color.r = mix(pixel.r, watermarkPixel.r, u_opacity * watermarkPixel.a);
+	out_color.g = mix(pixel.g, watermarkPixel.g, u_opacity * watermarkPixel.a);
+	out_color.b = mix(pixel.b, watermarkPixel.b, u_opacity * watermarkPixel.a);
+	out_color.a = pixel.a * (1.0 - u_opacity * watermarkPixel.a) + watermarkPixel.a * u_opacity;
+}
+`;
+
+export const FX_watermarkPlacement = defineImageEffectorFx({
+	id: 'watermarkPlacement' as const,
+	shader,
+	params: {
+		cover: {
+			type: 'boolean' as const,
+			default: false,
+		},
+		repeat: {
+			type: 'boolean' as const,
+			default: false,
+		},
+		scale: {
+			type: 'number' as const,
+			default: 0.3,
+			min: 0.0,
+			max: 1.0,
+			step: 0.01,
+		},
+		align: {
+			type: 'align' as const,
+			default: { x: 'right', y: 'bottom' },
+		},
+		opacity: {
+			type: 'number' as const,
+			default: 0.75,
+			min: 0.0,
+			max: 1.0,
+			step: 0.01,
+		},
+	},
+	main: ({ gl, program, params, preTexture, width, height, watermark }) => {
+		if (watermark == null) {
+			return;
+		}
+
+		gl.activeTexture(gl.TEXTURE0);
+		gl.bindTexture(gl.TEXTURE_2D, preTexture);
+		const u_texture_src = gl.getUniformLocation(program, 'u_texture_src');
+		gl.uniform1i(u_texture_src, 0);
+
+		gl.activeTexture(gl.TEXTURE1);
+		gl.bindTexture(gl.TEXTURE_2D, watermark.texture);
+		const u_texture_watermark = gl.getUniformLocation(program, 'u_texture_watermark');
+		gl.uniform1i(u_texture_watermark, 1);
+
+		const u_resolution_src = gl.getUniformLocation(program, 'u_resolution_src');
+		gl.uniform2fv(u_resolution_src, [width, height]);
+
+		const u_resolution_watermark = gl.getUniformLocation(program, 'u_resolution_watermark');
+		gl.uniform2fv(u_resolution_watermark, [watermark.width, watermark.height]);
+
+		const u_scale = gl.getUniformLocation(program, 'u_scale');
+		gl.uniform1f(u_scale, params.scale);
+
+		const u_opacity = gl.getUniformLocation(program, 'u_opacity');
+		gl.uniform1f(u_opacity, params.opacity);
+
+		const u_angle = gl.getUniformLocation(program, 'u_angle');
+		gl.uniform1f(u_angle, 0.0);
+
+		const u_repeat = gl.getUniformLocation(program, 'u_repeat');
+		gl.uniform1i(u_repeat, params.repeat ? 1 : 0);
+
+		const u_alignX = gl.getUniformLocation(program, 'u_alignX');
+		gl.uniform1i(u_alignX, params.align.x === 'left' ? 0 : params.align.x === 'right' ? 2 : 1);
+
+		const u_alignY = gl.getUniformLocation(program, 'u_alignY');
+		gl.uniform1i(u_alignY, params.align.y === 'top' ? 0 : params.align.y === 'bottom' ? 2 : 1);
+
+		const u_fitMode = gl.getUniformLocation(program, 'u_fitMode');
+		gl.uniform1i(u_fitMode, params.cover ? 1 : 0);
+	},
+});
diff --git a/packages/frontend/src/utility/watermark.ts b/packages/frontend/src/utility/watermark.ts
new file mode 100644
index 0000000000..caf947ebae
--- /dev/null
+++ b/packages/frontend/src/utility/watermark.ts
@@ -0,0 +1,64 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import type { ImageEffectorLayer } from '@/utility/image-effector/ImageEffector.js';
+
+export type WatermarkPreset = {
+	id: string;
+	name: string;
+	layers: ({
+		id: string;
+		type: 'text';
+		text: string;
+		repeat: boolean;
+		scale: number;
+		align: { x: 'left' | 'center' | 'right'; y: 'top' | 'center' | 'bottom' };
+		opacity: number;
+	} | {
+		id: string;
+		type: 'image';
+		imageUrl: string | null;
+		imageId: string | null;
+		cover: boolean;
+		repeat: boolean;
+		scale: number;
+		align: { x: 'left' | 'center' | 'right'; y: 'top' | 'center' | 'bottom' };
+		opacity: number;
+	})[];
+};
+
+export function makeImageEffectorLayers(layers: WatermarkPreset['layers']): ImageEffectorLayer[] {
+	return layers.map(layer => {
+		if (layer.type === 'text') {
+			return {
+				fxId: 'watermarkPlacement',
+				id: layer.id,
+				params: {
+					repeat: layer.repeat,
+					scale: layer.scale,
+					align: layer.align,
+					opacity: layer.opacity,
+					cover: false,
+				},
+				text: layer.text,
+				imageUrl: null,
+			};
+		} else {
+			return {
+				fxId: 'watermarkPlacement',
+				id: layer.id,
+				params: {
+					repeat: layer.repeat,
+					scale: layer.scale,
+					align: layer.align,
+					opacity: layer.opacity,
+					cover: layer.cover,
+				},
+				text: null,
+				imageUrl: layer.imageUrl ?? null,
+			};
+		}
+	});
+}