diff --git a/packages/backend/src/server/FileServerService.ts b/packages/backend/src/server/FileServerService.ts
index 8c7d92fc61..54b50041fd 100644
--- a/packages/backend/src/server/FileServerService.ts
+++ b/packages/backend/src/server/FileServerService.ts
@@ -265,7 +265,8 @@ export class FileServerService {
 				'avatar' in request.query ||
 				'static' in request.query ||
 				'preview' in request.query ||
-				'badge' in request.query
+				'badge' in request.query ||
+				'datasaver' in request.query
 			) {
 				if (!isConvertibleImage) {
 					// 画像でないなら404でお茶を濁す
@@ -330,7 +331,28 @@ export class FileServerService {
 					ext: 'png',
 					type: 'image/png',
 				};
-			} else if (file.mime === 'image/svg+xml') {
+			} else if ('datasaver' in request.query){
+				if (!isAnimationConvertibleImage && !('static' in request.query)) {
+					image = {
+						data: fs.createReadStream(file.path),
+						ext: file.ext,
+						type: file.mime,
+					};
+				} else {
+					const data = (await sharpBmp(file.path, file.mime, { animated: !('static' in request.query) }))
+						.resize({
+							height: 64,
+							withoutEnlargement: true,
+						})
+						.webp(webpDefault);
+
+					image = {
+						data,
+						ext: 'webp',
+						type: 'image/webp',
+					};
+				}
+			}else if (file.mime === 'image/svg+xml') {
 				image = this.imageProcessingService.convertToWebpStream(file.path, 2048, 2048);
 			} else if (!file.mime.startsWith('image/') || !FILE_TYPE_BROWSERSAFE.includes(file.mime)) {
 				throw new StatusError('Rejected type', 403, 'Rejected type');
diff --git a/packages/frontend/src/components/global/MkCustomEmoji.vue b/packages/frontend/src/components/global/MkCustomEmoji.vue
index bef7c59d77..b01a172a60 100644
--- a/packages/frontend/src/components/global/MkCustomEmoji.vue
+++ b/packages/frontend/src/components/global/MkCustomEmoji.vue
@@ -38,13 +38,20 @@ const rawUrl = computed(() => {
 
 const url = computed(() => {
 	if (rawUrl.value == null) return null;
-
+  const useOriginalSize = props.useOriginalSize;
+  const enableDataSaverMode = defaultStore.state.enableDataSaverMode;
+  let datasaver_result ;
+  if (enableDataSaverMode) {
+    datasaver_result = useOriginalSize ? undefined : 'datasaver';
+  } else {
+    datasaver_result = useOriginalSize ? undefined : 'emoji';
+  }
 	const proxied =
 		(rawUrl.value.startsWith('/emoji/') || (props.useOriginalSize && isLocal.value))
 			? rawUrl.value
 			: getProxiedImageUrl(
 				rawUrl.value,
-				props.useOriginalSize ? undefined : 'emoji',
+            datasaver_result,
 				false,
 				true,
 			);