diff --git a/YaeBlog/Exceptions/BlogCommandException.cs b/YaeBlog/Exceptions/BlogCommandException.cs
new file mode 100644
index 0000000..0db929d
--- /dev/null
+++ b/YaeBlog/Exceptions/BlogCommandException.cs
@@ -0,0 +1,12 @@
+namespace YaeBlog.Core.Exceptions;
+
+public class BlogCommandException : Exception
+{
+    public BlogCommandException(string message) : base(message)
+    {
+    }
+
+    public BlogCommandException(string message, Exception innerException) : base(message, innerException)
+    {
+    }
+}
diff --git a/YaeBlog/Services/ImageCompressService.cs b/YaeBlog/Services/ImageCompressService.cs
index 9d50661..831e230 100644
--- a/YaeBlog/Services/ImageCompressService.cs
+++ b/YaeBlog/Services/ImageCompressService.cs
@@ -56,7 +56,7 @@ public sealed class ImageCompressService(IEssayScanService essayScanService, ILo
             }
 
             CompressResult[] compressedImages = (await Task.WhenAll(from image in uncompressedImages
-                select Task.Run(async () => new CompressResult(image, await ConvertToWebp(image.Content))))).ToArray();
+                select Task.Run(async () => new CompressResult(image, await ConvertToWebp(image))))).ToArray();
 
             compressedSize += compressedImages.Select(i => i.CompressContent.Length).Sum();
 
@@ -65,7 +65,8 @@ public sealed class ImageCompressService(IEssayScanService essayScanService, ILo
                 select r.ImageInfo with
                 {
                     File = new FileInfo(r.ImageInfo.File.FullName.Split('.')[0] + ".webp"),
-                    Content = r.CompressContent
+                    Content = r.CompressContent,
+                    MineType = "image/webp"
                 }).ToList();
             // 修改文本
             string blogContent = compressedImages.Aggregate(content.Content, (c, r) =>
@@ -88,21 +89,31 @@ public sealed class ImageCompressService(IEssayScanService essayScanService, ILo
         }
     }
 
-    private static async Task<byte[]> ConvertToWebp(byte[] image)
+    private static async Task<byte[]> ConvertToWebp(BlogImageInfo image)
     {
         using ImageJob job = new();
-        BuildJobResult result = await job.Decode(MemorySource.Borrow(image))
+        BuildJobResult result = await job.Decode(MemorySource.Borrow(image.Content))
+            .Branch(f => f.EncodeToBytes(new WebPLosslessEncoder()))
             .EncodeToBytes(new WebPLossyEncoder(75))
             .Finish()
             .InProcessAsync();
 
-        ArraySegment<byte>? array = result.First?.TryGetBytes();
+        // 超过128KB的图片使用有损压缩
+        // 反之使用无损压缩
 
-        if (array.HasValue)
+        ArraySegment<byte>? losslessImage = result.TryGet(1)?.TryGetBytes();
+        ArraySegment<byte>? lossyImage = result.TryGet(2)?.TryGetBytes();
+
+        if (image.Size <= 128 * 1024 && losslessImage.HasValue)
         {
-            return array.Value.ToArray();
+            return losslessImage.Value.ToArray();
         }
 
-        throw new BlogFileException();
+        if (lossyImage.HasValue)
+        {
+            return lossyImage.Value.ToArray();
+        }
+
+        throw new BlogCommandException($"Failed to convert {image.File.Name} to webp format: return value is null.");
     }
 }