diff --git a/backend/routes/admin.js b/backend/routes/admin.js
index 526e2a2..3159013 100644
--- a/backend/routes/admin.js
+++ b/backend/routes/admin.js
@@ -171,40 +171,75 @@ router.post(
           .json({ error: "필수 필드를 모두 입력해주세요." });
       }
 
-      let coverUrl = null;
+      let coverOriginalUrl = null;
+      let coverMediumUrl = null;
+      let coverThumbUrl = null;
 
-      // 커버 이미지 업로드
+      // 커버 이미지 업로드 (3개 해상도)
       if (req.file) {
-        // WebP 변환 (원본 크기, 무손실)
-        const processedImage = await sharp(req.file.buffer)
-          .webp({ lossless: true })
-          .toBuffer();
+        // 3가지 크기로 변환 (병렬)
+        const [originalBuffer, mediumBuffer, thumbBuffer] = await Promise.all([
+          sharp(req.file.buffer).webp({ lossless: true }).toBuffer(),
+          sharp(req.file.buffer)
+            .resize(800, null, { withoutEnlargement: true })
+            .webp({ quality: 85 })
+            .toBuffer(),
+          sharp(req.file.buffer)
+            .resize(400, null, { withoutEnlargement: true })
+            .webp({ quality: 80 })
+            .toBuffer(),
+        ]);
 
-        const coverKey = `album/${folder_name}/cover.webp`;
+        const basePath = `album/${folder_name}/cover`;
 
-        await s3Client.send(
-          new PutObjectCommand({
-            Bucket: BUCKET,
-            Key: coverKey,
-            Body: processedImage,
-            ContentType: "image/webp",
-          })
-        );
+        // S3 업로드 (병렬)
+        await Promise.all([
+          s3Client.send(
+            new PutObjectCommand({
+              Bucket: BUCKET,
+              Key: `${basePath}/original/cover.webp`,
+              Body: originalBuffer,
+              ContentType: "image/webp",
+            })
+          ),
+          s3Client.send(
+            new PutObjectCommand({
+              Bucket: BUCKET,
+              Key: `${basePath}/medium_800/cover.webp`,
+              Body: mediumBuffer,
+              ContentType: "image/webp",
+            })
+          ),
+          s3Client.send(
+            new PutObjectCommand({
+              Bucket: BUCKET,
+              Key: `${basePath}/thumb_400/cover.webp`,
+              Body: thumbBuffer,
+              ContentType: "image/webp",
+            })
+          ),
+        ]);
 
-        coverUrl = `${process.env.RUSTFS_ENDPOINT}/${BUCKET}/${coverKey}`;
+        const publicUrl =
+          process.env.RUSTFS_PUBLIC_URL || process.env.RUSTFS_ENDPOINT;
+        coverOriginalUrl = `${publicUrl}/${BUCKET}/${basePath}/original/cover.webp`;
+        coverMediumUrl = `${publicUrl}/${BUCKET}/${basePath}/medium_800/cover.webp`;
+        coverThumbUrl = `${publicUrl}/${BUCKET}/${basePath}/thumb_400/cover.webp`;
       }
 
       // 앨범 삽입
       const [albumResult] = await connection.query(
-        `INSERT INTO albums (title, album_type, album_type_short, release_date, folder_name, cover_url, description)
-       VALUES (?, ?, ?, ?, ?, ?, ?)`,
+        `INSERT INTO albums (title, album_type, album_type_short, release_date, folder_name, cover_original_url, cover_medium_url, cover_thumb_url, description)
+       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)`,
         [
           title,
           album_type,
           album_type_short || null,
           release_date,
           folder_name,
-          coverUrl,
+          coverOriginalUrl,
+          coverMediumUrl,
+          coverThumbUrl,
           description || null,
         ]
       );
@@ -278,31 +313,65 @@ router.put(
         return res.status(404).json({ error: "앨범을 찾을 수 없습니다." });
       }
 
-      let coverUrl = existingAlbums[0].cover_url;
+      let coverOriginalUrl = existingAlbums[0].cover_original_url;
+      let coverMediumUrl = existingAlbums[0].cover_medium_url;
+      let coverThumbUrl = existingAlbums[0].cover_thumb_url;
 
-      // WebP 변환 (원본 크기, 무손실)
+      // 커버 이미지 업로드 (3개 해상도)
       if (req.file) {
-        const processedImage = await sharp(req.file.buffer)
-          .webp({ lossless: true })
-          .toBuffer();
+        // 3가지 크기로 변환 (병렬)
+        const [originalBuffer, mediumBuffer, thumbBuffer] = await Promise.all([
+          sharp(req.file.buffer).webp({ lossless: true }).toBuffer(),
+          sharp(req.file.buffer)
+            .resize(800, null, { withoutEnlargement: true })
+            .webp({ quality: 85 })
+            .toBuffer(),
+          sharp(req.file.buffer)
+            .resize(400, null, { withoutEnlargement: true })
+            .webp({ quality: 80 })
+            .toBuffer(),
+        ]);
 
-        const coverKey = `album/${folder_name}/cover.webp`;
+        const basePath = `album/${folder_name}/cover`;
 
-        await s3Client.send(
-          new PutObjectCommand({
-            Bucket: BUCKET,
-            Key: coverKey,
-            Body: processedImage,
-            ContentType: "image/webp",
-          })
-        );
+        // S3 업로드 (병렬)
+        await Promise.all([
+          s3Client.send(
+            new PutObjectCommand({
+              Bucket: BUCKET,
+              Key: `${basePath}/original/cover.webp`,
+              Body: originalBuffer,
+              ContentType: "image/webp",
+            })
+          ),
+          s3Client.send(
+            new PutObjectCommand({
+              Bucket: BUCKET,
+              Key: `${basePath}/medium_800/cover.webp`,
+              Body: mediumBuffer,
+              ContentType: "image/webp",
+            })
+          ),
+          s3Client.send(
+            new PutObjectCommand({
+              Bucket: BUCKET,
+              Key: `${basePath}/thumb_400/cover.webp`,
+              Body: thumbBuffer,
+              ContentType: "image/webp",
+            })
+          ),
+        ]);
 
-        coverUrl = `${process.env.RUSTFS_ENDPOINT}/${BUCKET}/${coverKey}`;
+        const publicUrl =
+          process.env.RUSTFS_PUBLIC_URL || process.env.RUSTFS_ENDPOINT;
+        coverOriginalUrl = `${publicUrl}/${BUCKET}/${basePath}/original/cover.webp`;
+        coverMediumUrl = `${publicUrl}/${BUCKET}/${basePath}/medium_800/cover.webp`;
+        coverThumbUrl = `${publicUrl}/${BUCKET}/${basePath}/thumb_400/cover.webp`;
       }
 
       // 앨범 업데이트
       await connection.query(
-        `UPDATE albums SET title = ?, album_type = ?, album_type_short = ?, release_date = ?, folder_name = ?, cover_url = ?, description = ?
+        `UPDATE albums SET title = ?, album_type = ?, album_type_short = ?, release_date = ?, folder_name = ?, cover_original_url = ?, cover_medium_url = ?, cover_thumb_url = ?, description = ?
        WHERE id = ?`,
         [
           title,
@@ -310,7 +379,9 @@ router.put(
           album_type_short || null,
           release_date,
           folder_name,
-          coverUrl,
+          coverOriginalUrl,
+          coverMediumUrl,
+          coverThumbUrl,
           description || null,
           albumId,
         ]
@@ -375,17 +446,21 @@ router.delete("/albums/:id", authenticateToken, async (req, res) => {
 
     const album = existingAlbums[0];
 
-    // RustFS에서 커버 이미지 삭제
-    if (album.cover_url && album.folder_name) {
-      try {
-        await s3Client.send(
-          new DeleteObjectCommand({
-            Bucket: BUCKET,
-            Key: `album/${album.folder_name}/cover.webp`,
-          })
-        );
-      } catch (s3Error) {
-        console.error("S3 삭제 오류:", s3Error);
+    // RustFS에서 커버 이미지 삭제 (3가지 크기)
+    if (album.cover_original_url && album.folder_name) {
+      const basePath = `album/${album.folder_name}/cover`;
+      const sizes = ["original", "medium_800", "thumb_400"];
+      for (const size of sizes) {
+        try {
+          await s3Client.send(
+            new DeleteObjectCommand({
+              Bucket: BUCKET,
+              Key: `${basePath}/${size}/cover.webp`,
+            })
+          );
+        } catch (s3Error) {
+          console.error(`S3 커버 삭제 오류 (${size}):`, s3Error);
+        }
       }
     }
 
diff --git a/backend/routes/albums.js b/backend/routes/albums.js
index 669de07..a58440a 100644
--- a/backend/routes/albums.js
+++ b/backend/routes/albums.js
@@ -62,7 +62,7 @@ async function getAlbumDetails(album) {
 router.get("/", async (req, res) => {
   try {
     const [albums] = await pool.query(
-      "SELECT id, title, album_type, album_type_short, release_date, cover_url FROM albums ORDER BY release_date DESC"
+      "SELECT id, title, album_type, album_type_short, release_date, cover_original_url, cover_medium_url, cover_thumb_url FROM albums ORDER BY release_date DESC"
     );
 
     // 각 앨범에 트랙 정보 추가
diff --git a/frontend/src/pages/pc/Album.jsx b/frontend/src/pages/pc/Album.jsx
index 88eb6f6..fbc367c 100644
--- a/frontend/src/pages/pc/Album.jsx
+++ b/frontend/src/pages/pc/Album.jsx
@@ -121,7 +121,7 @@ function Album() {
                                 style={{ viewTransitionName: `album-cover-${album.id}` }}
                             >
                                 <img
-                                    src={album.cover_url}
+                                    src={album.cover_medium_url || album.cover_original_url}
                                     alt={album.title}
                                     loading="lazy"
                                     className="w-full h-full object-cover group-hover:scale-105 transition-transform duration-500 will-change-transform"
diff --git a/frontend/src/pages/pc/AlbumDetail.jsx b/frontend/src/pages/pc/AlbumDetail.jsx
index 1bdb5cd..2280825 100644
--- a/frontend/src/pages/pc/AlbumDetail.jsx
+++ b/frontend/src/pages/pc/AlbumDetail.jsx
@@ -249,7 +249,7 @@ function AlbumDetail() {
                         className="w-80 h-80 flex-shrink-0 rounded-2xl overflow-hidden shadow-lg"
                     >
                         <img
-                            src={album.cover_url}
+                            src={album.cover_medium_url || album.cover_original_url}
                             alt={album.title}
                             className="w-full h-full object-cover"
                         />
diff --git a/frontend/src/pages/pc/admin/AdminAlbumForm.jsx b/frontend/src/pages/pc/admin/AdminAlbumForm.jsx
index abaddcf..727b133 100644
--- a/frontend/src/pages/pc/admin/AdminAlbumForm.jsx
+++ b/frontend/src/pages/pc/admin/AdminAlbumForm.jsx
@@ -371,7 +371,9 @@ function AdminAlbumForm() {
         album_type: '',
         album_type_short: '',
         release_date: '',
-        cover_url: '',
+        cover_original_url: '',
+        cover_medium_url: '',
+        cover_thumb_url: '',
         folder_name: '',
         description: '',
     });
@@ -399,12 +401,14 @@ function AdminAlbumForm() {
                         album_type: data.album_type || '',
                         album_type_short: data.album_type_short || '',
                         release_date: data.release_date ? data.release_date.split('T')[0] : '',
-                        cover_url: data.cover_url || '',
+                        cover_original_url: data.cover_original_url || '',
+                        cover_medium_url: data.cover_medium_url || '',
+                        cover_thumb_url: data.cover_thumb_url || '',
                         folder_name: data.folder_name || '',
                         description: data.description || '',
                     });
-                    if (data.cover_url) {
-                        setCoverPreview(data.cover_url);
+                    if (data.cover_medium_url || data.cover_original_url) {
+                        setCoverPreview(data.cover_medium_url || data.cover_original_url);
                     }
                     setTracks(data.tracks || []);
                     setLoading(false);
diff --git a/frontend/src/pages/pc/admin/AdminAlbumPhotos.jsx b/frontend/src/pages/pc/admin/AdminAlbumPhotos.jsx
index a6f9978..de98d7c 100644
--- a/frontend/src/pages/pc/admin/AdminAlbumPhotos.jsx
+++ b/frontend/src/pages/pc/admin/AdminAlbumPhotos.jsx
@@ -720,7 +720,7 @@ function AdminAlbumPhotos() {
                 >
                     <div className="flex items-center gap-4">
                         <img 
-                            src={album?.cover_url} 
+                            src={album?.cover_thumb_url || album?.cover_original_url} 
                             alt={album?.title}
                             className="w-14 h-14 rounded-xl object-cover"
                         />
diff --git a/frontend/src/pages/pc/admin/AdminAlbums.jsx b/frontend/src/pages/pc/admin/AdminAlbums.jsx
index 899f7e5..e984d3c 100644
--- a/frontend/src/pages/pc/admin/AdminAlbums.jsx
+++ b/frontend/src/pages/pc/admin/AdminAlbums.jsx
@@ -260,7 +260,7 @@ function AdminAlbums() {
                                         <td className="px-6 py-4">
                                             <div className="flex items-center gap-4">
                                                 <img
-                                                    src={album.cover_url}
+                                                    src={album.cover_thumb_url || album.cover_original_url}
                                                     alt={album.title}
                                                     className="w-12 h-12 rounded-lg object-cover"
                                                 />