diff --git a/Admin.NET/Admin.NET.Core/Service/File/SysFileService.cs b/Admin.NET/Admin.NET.Core/Service/File/SysFileService.cs
index b44d06ff..236d0655 100644
--- a/Admin.NET/Admin.NET.Core/Service/File/SysFileService.cs
+++ b/Admin.NET/Admin.NET.Core/Service/File/SysFileService.cs
@@ -76,18 +76,22 @@ public class SysFileService : IDynamicApiController, ITransient
     [DisplayName("上传文件Base64")]
     public async Task<SysFile> UploadFileFromBase64(UploadFileFromBase64Input input)
     {
-        byte[] fileData = Convert.FromBase64String(input.FileDataBase64);
+        var pattern = @"data:(?<type>.+?);base64,(?<data>[^""]+)";
+        var regex = new Regex(pattern, RegexOptions.Compiled);
+        var match = regex.Match(input.FileDataBase64);
+
+        byte[] fileData = Convert.FromBase64String(match.Groups["data"].Value);
+        var contentType = match.Groups["type"].Value;
+        if (string.IsNullOrEmpty(input.FileName))
+            input.FileName = $"{YitIdHelper.NextId()}.{contentType.AsSpan(contentType.LastIndexOf('/') + 1)}";
+
         var ms = new MemoryStream();
         ms.Write(fileData);
         ms.Seek(0, SeekOrigin.Begin);
-        if (string.IsNullOrEmpty(input.FileName))
-            input.FileName = $"{YitIdHelper.NextId()}.jpg";
-        if (string.IsNullOrEmpty(input.ContentType))
-            input.ContentType = "image/jpg";
         IFormFile formFile = new FormFile(ms, 0, fileData.Length, "file", input.FileName)
         {
             Headers = new HeaderDictionary(),
-            ContentType = input.ContentType
+            ContentType = contentType
         };
         return await UploadFile(new FileUploadInput { File = formFile, Path = input.Path, FileType = input.FileType, IsPublic = input.IsPublic });
     }