diff --git a/src/renderer/plugins/markdown-link.ts b/src/renderer/plugins/markdown-link.ts
index 5adb15c6..9f962004 100644
--- a/src/renderer/plugins/markdown-link.ts
+++ b/src/renderer/plugins/markdown-link.ts
@@ -183,7 +183,12 @@ export default {
           try {
             const originSrc = node.getAttribute(DOM_ATTR_NAME.ORIGIN_SRC)
             const res: Response = await ctx.api.fetchHttp(srcAttr)
-            const file = new File([await res.blob()], originSrc ? ctx.utils.path.basename(originSrc) : 'img')
+            const fileName = originSrc ? ctx.utils.path.basename(originSrc) : 'img'
+            const file = new File(
+              [await res.blob()],
+              fileName,
+              { type: ctx.lib.mime.getType(fileName) || undefined }
+            )
 
             let url: string | undefined
             if (options.inlineLocalImage) {