Convert MP4 to MKV

How it works

1. 1

   Add your MP4 file

   Drop, pick, or paste it. It stays on your device.

2. 2

   Convert

   We re-encode it to MKV right here in your browser.

3. 3

   Download

   Save the MKV file. No watermark, no signup.

Why nothing uploads

Other tools send your video to their servers, which costs them money per file, so they add watermarks, cap file sizes, and make you sign up. This tool does the work right here in your browser using your own device. Your file is never uploaded, so there is no wait, no watermark, no size limit, and no account.

Questions

Is this MP4 to MKV converter free?

Yes, no account, no trial, no watermark, no size limit.

Does my file get uploaded?

No. Conversion happens in your browser; your file never leaves your device.

Will converting to MKV reduce quality?

Re-encoding always involves some loss, but we use sensible high-quality settings. To also shrink the file, use the compressor.

What if my file won't open?

Some exotic codecs can't be read in the browser. Try a different source file or format.

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