diff --git a/handler/router.go b/handler/router.go
index 2c5df46..cf07931 100644
--- a/handler/router.go
+++ b/handler/router.go
@@ -95,11 +95,28 @@ func Convert(c *fiber.Ctx) error {
 	}
 
 	// 处理图片
-	err := encoder.ProcessAndSaveImage(rawImageAbs, exhaustFilename, extraParams)
+
+	// 检查文件大小
+	isSmall, err := helper.IsFileSizeSmall(rawImageAbs, 100*1024) // 100KB
 	if err != nil {
-		log.Errorf("处理图片失败: %v", err)
+		log.Errorf("检查文件大小时出错: %v", err)
 		return c.SendStatus(fiber.StatusInternalServerError)
 	}
 
+	if isSmall {
+		log.Infof("文件 %s 小于100KB，直接复制到 EXHAUST_PATH", rawImageAbs)
+		if err := helper.CopyFile(rawImageAbs, exhaustFilename); err != nil {
+			log.Errorf("复制小文件到 EXHAUST_PATH 失败: %v", err)
+			return c.SendStatus(fiber.StatusInternalServerError)
+		}
+	} else {
+		// 处理图片
+		err := encoder.ProcessAndSaveImage(rawImageAbs, exhaustFilename, extraParams)
+		if err != nil {
+			log.Errorf("处理图片失败: %v", err)
+			return c.SendStatus(fiber.StatusInternalServerError)
+		}
+	}
+
 	return c.SendFile(exhaustFilename)
 }
diff --git a/helper/helper.go b/helper/helper.go
index 99c4d69..de1ca6a 100644
--- a/helper/helper.go
+++ b/helper/helper.go
@@ -242,7 +242,7 @@ func IsAllowedImageFile(filename string) bool {
 	return slices.Contains(allowedTypes, ext)
 }
 
-// 小于100KB文件直接复制到EXHAUST_PATH
+// 直接复制到EXHAUST_PATH
 func CopyFile(src, dst string) error {
 	sourceFileStat, err := os.Stat(src)
 	if err != nil {