diff --git a/server.js b/server.js
index a137a64..55eed51 100644
--- a/server.js
+++ b/server.js
@@ -76,27 +76,30 @@ fastify.post("/entry", async function (request, reply) {
   let tmpdir = path.dirname(audiofile.filepath);
   // console.log(audiofile.fields.message.value);
 
-  //convert to mp3
-  function converter() {
-   return new Promise((resolve, reject) => {
-     //
-     let outputFile = tmpdir + "/converted.mp3";
-     // --> https://stackoverflow.com/a/36109219 (a quick tip on fluent-ffmpeg)
-     ffmpeg()
-     .addInput(audiofile.filepath)
-     .on("error", function(err) {
-       reject(err);
-     })
-     .on("end", function() {
-       resolve(outputFile);
-     })
-     .outputOptions('-b:a 192000')
-     .output(outputFile)
-     .run();
-   });
+  //convert to mp3 ?
+  if (path.extname(audiofile.filename) !== ".mp3") {
+    console.log("convert to mp3...");
+    function converter() {
+     return new Promise((resolve, reject) => {
+       //
+       let outputFile = tmpdir + "/converted.mp3";
+       // --> https://stackoverflow.com/a/36109219 (a quick tip on fluent-ffmpeg)
+       ffmpeg()
+       .addInput(audiofile.filepath)
+       .on("error", function(err) {
+         reject(err);
+       })
+       .on("end", function() {
+         resolve(outputFile);
+       })
+       .outputOptions('-b:a 192000')
+       .output(outputFile)
+       .run();
+     });
+    }
+    await converter();
+    // console.log(await fs.readdir(tmpdir));
   }
-  await converter();
-  // console.log(await fs.readdir(tmpdir));
 
   //upload
   const client = new Client(server);