MKV
MP4 to MKV
Convert MP4 videos to MKV. It’s free, works in your browser, and your files are never uploaded.
How to use MP4 to MKV
- Add your file by dragging it in or choosing it.
- Choose your options.
- Click “Convert” and download the result.
Why use MP4 to MKV on Free File Converter Fox
- Private. Files are processed on your device and never uploaded.
- Free. No account, watermark or daily limit.
- Fast. No upload or download wait, since everything runs locally.
Frequently asked questions
Is MP4 to MKV free?
Yes. MP4 to MKV on Free File Converter Fox is free, with no sign-up, watermark or daily limit.
Is my file uploaded to a server?
No. MP4 to MKV runs entirely in your browser, so your files stay on your device and are never sent to us.
What’s the difference between MP4 and MKV?
MP4 (H.264) is the most widely supported video format. MKV is a flexible container often used for high-quality video.
What should I do if MP4 to MKV fails?
Try a smaller file, reload the page, or use a current version of Chrome, Edge, Firefox or Safari. Very large files can run out of memory, especially on phones.
Can I process several files at once?
Yes. Add multiple files, then download each result or all of them together as a ZIP.