diff --git a/examples/browser/concatDemux.html b/examples/browser/concatDemux.html
new file mode 100644
index 0000000..9cb3586
--- /dev/null
+++ b/examples/browser/concatDemux.html
@@ -0,0 +1,53 @@
+<html>
+  <head>
+    <script src="/dist/ffmpeg.dev.js"></script>
+    <style>
+      html,
+      body {
+        margin: 0;
+        width: 100%;
+        height: 100%;
+      }
+
+      body {
+        display: flex;
+        flex-direction: column;
+        align-items: center;
+      }
+    </style>
+  </head>
+
+  <body>
+    <h3>Upload a Video File</h3>
+    <video id="output-video" controls></video><br />
+    <input type="file" id="uploader" />
+    <p id="message"></p>
+    <script>
+      const { createWorker } = FFmpeg;
+      const worker = createWorker({
+        corePath: "../../node_modules/@ffmpeg/core/ffmpeg-core.js",
+        logger: ({ message }) => console.log(message)
+      });
+
+      const transcode = async ({ target: { files } }) => {
+        const message = document.getElementById("message");
+        const { name } = files[0];
+        message.innerHTML = "Loading ffmpeg-core.js";
+        await worker.load();
+        message.innerHTML = "Start Concating";
+        await worker.write(name, files[0]);
+        const textFileName = "list.txt";
+        await worker.writeText(textFileName, `file ${name}\nfile ${name}`);
+        await worker.concatDemux(textFileName, "output.mp4");
+        message.innerHTML = "Complete Concating";
+        const { data } = await worker.read("output.mp4");
+        const video = document.getElementById("output-video");
+        video.src = URL.createObjectURL(
+          new Blob([data.buffer], { type: "video/mp4" })
+        );
+      };
+      const elm = document.getElementById("uploader");
+      elm.addEventListener("change", transcode);
+    </script>
+  </body>
+</html>
diff --git a/src/createWorker.js b/src/createWorker.js
index d04a724..b9be297 100644
--- a/src/createWorker.js
+++ b/src/createWorker.js
@@ -122,6 +122,12 @@ module.exports = (_options = {}) => {
     )
   );
 
+  const concatDemux = (texFilePath, outputPath, opts = '', del = false, jobId) => {
+    run(`${opts} -f concat -safe 0 -i /data/${texFilePath} -c copy ${outputPath}`,
+      { del },
+      jobId);
+  };
+
   const ls = (path, jobId) => (
     startJob(createJob({
       id: jobId, action: 'ls', payload: { path },
@@ -175,6 +181,7 @@ module.exports = (_options = {}) => {
     run,
     transcode,
     trim,
+    concatDemux,
     ls,
     terminate,
   };
