diff --git a/back/src/Kyoo.Core/Controllers/ThumbnailsManager.cs b/back/src/Kyoo.Core/Controllers/ThumbnailsManager.cs
index 3c276145..41fdb42b 100644
--- a/back/src/Kyoo.Core/Controllers/ThumbnailsManager.cs
+++ b/back/src/Kyoo.Core/Controllers/ThumbnailsManager.cs
@@ -56,7 +56,7 @@ namespace Kyoo.Core.Controllers
 
 		private static async Task _WriteTo(SKBitmap bitmap, string path)
 		{
-			SKData data = bitmap.Encode(SKEncodedImageFormat.Jpeg, 18);
+			SKData data = bitmap.Encode(SKEncodedImageFormat.Webp, 18);
 			await using Stream reader = data.AsStream();
 			await using Stream file = File.Create(path);
 			await reader.CopyToAsync(file);
@@ -80,13 +80,13 @@ namespace Kyoo.Core.Controllers
 				using SKBitmap original = SKBitmap.Decode(codec, info);
 
 				using SKBitmap high = original.Resize(new SKSizeI(original.Width, original.Height), SKFilterQuality.High);
-				await _WriteTo(high, $"{localPath}.{ImageQuality.High.ToString().ToLowerInvariant()}.jpg");
+				await _WriteTo(high, $"{localPath}.{ImageQuality.High.ToString().ToLowerInvariant()}.webp");
 
 				using SKBitmap medium = high.Resize(new SKSizeI((int)(high.Width / 1.5), (int)(high.Height / 1.5)), SKFilterQuality.Medium);
-				await _WriteTo(medium, $"{localPath}.{ImageQuality.Medium.ToString().ToLowerInvariant()}.jpg");
+				await _WriteTo(medium, $"{localPath}.{ImageQuality.Medium.ToString().ToLowerInvariant()}.webp");
 
 				using SKBitmap low = medium.Resize(new SKSizeI(medium.Width / 2, medium.Height / 2), SKFilterQuality.Low);
-				await _WriteTo(low, $"{localPath}.{ImageQuality.Low.ToString().ToLowerInvariant()}.jpg");
+				await _WriteTo(low, $"{localPath}.{ImageQuality.Low.ToString().ToLowerInvariant()}.webp");
 
 				image.Blurhash = Blurhasher.Encode(low, 4, 3);
 			}
@@ -124,7 +124,7 @@ namespace Kyoo.Core.Controllers
 		public string GetImagePath<T>(T item, string image, ImageQuality quality)
 			where T : IThumbnails
 		{
-			return $"{_GetBaseImagePath(item, image)}.{quality.ToString().ToLowerInvariant()}.jpg";
+			return $"{_GetBaseImagePath(item, image)}.{quality.ToString().ToLowerInvariant()}.webp";
 		}
 	}
 }
diff --git a/back/src/Kyoo.Core/Views/Helper/CrudThumbsApi.cs b/back/src/Kyoo.Core/Views/Helper/CrudThumbsApi.cs
index d02cb624..13ccbf99 100644
--- a/back/src/Kyoo.Core/Views/Helper/CrudThumbsApi.cs
+++ b/back/src/Kyoo.Core/Views/Helper/CrudThumbsApi.cs
@@ -68,7 +68,7 @@ namespace Kyoo.Core.Api
 			string path = _thumbs.GetImagePath(resource, image, quality ?? ImageQuality.High);
 			if (path == null || !System.IO.File.Exists(path))
 				return NotFound();
-			return PhysicalFile(Path.GetFullPath(path), "image/jpeg", true);
+			return PhysicalFile(Path.GetFullPath(path), "image/webp", true);
 		}
 
 		/// <summary>