diff --git a/backend/src/services/youtube/api.js b/backend/src/services/youtube/api.js
index bb46e85..5ace974 100644
--- a/backend/src/services/youtube/api.js
+++ b/backend/src/services/youtube/api.js
@@ -62,12 +62,16 @@ export async function getChannelInfo(channelId) {
   const channel = data.items[0];
   const { snippet, brandingSettings } = channel;
 
+  // 배너 URL에 고해상도 파라미터 추가
+  const bannerBase = brandingSettings?.image?.bannerExternalUrl;
+  const bannerUrl = bannerBase ? `${bannerBase}=w2560` : null;
+
   return {
     channelId,
     title: snippet.title,
     description: snippet.description,
     thumbnailUrl: snippet.thumbnails?.high?.url || snippet.thumbnails?.default?.url,
-    bannerUrl: brandingSettings?.image?.bannerExternalUrl || null,
+    bannerUrl,
   };
 }