backend/Musify.Infrastructure/Services/YouTubeMusicService.cs

@@ -167,8 +167,11 @@ namespace Musify.Infrastructure.Services
         {
             var ordered = thumbnails.OrderBy(thumbnail => thumbnail.Width).ToList();
 
-            var chosen = ordered.FirstOrDefault(thumbnail => thumbnail.Width >= configuration.ThumbnailSize)
+            var square = ordered.Where(thumbnail => YouTubeThumbnail.IsSquare(thumbnail.Url)).ToList();
-                ?? ordered.LastOrDefault();
+            var candidates = square.Count > 0 ? square : ordered;
+
+            var chosen = candidates.FirstOrDefault(thumbnail => thumbnail.Width >= configuration.ThumbnailSize)
+                ?? candidates.LastOrDefault();
 
             return chosen is null
                 ? string.Empty

backend/Musify.Infrastructure/Services/YouTubeThumbnail.cs

@@ -2,6 +2,9 @@ namespace Musify.Infrastructure.Services
 {
     public static class YouTubeThumbnail
     {
+        public static bool IsSquare(string url) =>
+            url.Contains("googleusercontent.com", StringComparison.OrdinalIgnoreCase);
+
         public static string WithSize(string url, int size)
         {
             if (string.IsNullOrEmpty(url))
@@ -40,9 +43,9 @@ namespace Musify.Infrastructure.Services
 
         private static string YtImgFileName(int size) => size switch
         {
-            <= 120 => "default.jpg",
+            <= 90 => "default.jpg",
-            <= 320 => "mqdefault.jpg",
+            <= 180 => "mqdefault.jpg",
-            <= 480 => "hqdefault.jpg",
+            <= 360 => "hqdefault.jpg",
             _ => "maxresdefault.jpg"
         };
 

web-player/src/lib/server/thumbnails.ts

@@ -55,9 +55,9 @@ export function resizeThumbnailUrl(url: URL, size: number): string {
 }
 
 function ytImgFileName(size: number): string {
-	if (size <= 120) return 'default.jpg';
+	if (size <= 90) return 'default.jpg';
-	if (size <= 320) return 'mqdefault.jpg';
+	if (size <= 180) return 'mqdefault.jpg';
-	if (size <= 480) return 'hqdefault.jpg';
+	if (size <= 360) return 'hqdefault.jpg';
 	return 'maxresdefault.jpg';
 }
 

web-player/src/lib/thumbnails.ts

@@ -1,7 +1,7 @@
 export const THUMBNAIL_SIZES = {
-	small: 96,
+	small: 128,
-	medium: 160,
+	medium: 192,
-	large: 320
+	large: 360
 } as const;
 
 export type ThumbnailSize = keyof typeof THUMBNAIL_SIZES;