Convert Video
Convert any video to MP4, WebM, MOV, MKV or AVI — without uploading it.
Processing happens on your device, so speed depends on your computer. Files up to about 500 MB work best.
Runs 100% in your browser. Your files are not uploaded to any server.
How to use Convert Video
- Drop a video file into the box.
- Choose the format you need — MP4 works on nearly every device.
- Tick “Fast mode” to re-package without re-encoding when you only need a different container.
- Click “Convert video” and download the result.
Frequently asked questions
Which format should I choose?
MP4 (H.264) plays on almost every phone, computer, TV and website. Choose WebM for web pages, MOV for Apple editing apps.
What is Fast mode?
It copies the existing audio and video streams into the new container without re-encoding — it's nearly instant and lossless. It works when the codecs are compatible, for example MKV with H.264 to MP4. If it fails, turn it off.
Is Convert Video free?
Yes. Convert Video is free to use with no sign-up and no watermark.
Are my files uploaded to your server?
No. All processing happens locally in your browser using JavaScript and WebAssembly. Your files never leave your device, which also makes it fast and private.
Does it work on my phone?
Yes. It works in any modern browser on Windows, Mac, Linux, Android and iPhone. Very large files may be slow on older phones.