Convert
Convert MKV to MP4
Free, in your browser, with no watermark and no signup. Both are video files; this changes how the video is packaged and encoded.
Why you have a MKV file
MKV is the flexible container recording software reaches for, because it survives a crash mid-recording instead of corrupting the whole file. That makes it the default for a lot of capture setups, and also the reason your recording will not upload anywhere.
What the conversion actually does
MKV can hold almost anything, but a screen or gameplay recording is usually already H.264 with AAC audio, so moving it into MP4 is mostly a container change and the picture is untouched.
Worth knowing first
MKV supports multiple audio tracks and subtitle tracks in one file. MP4 handles that far less gracefully, so a multi-track MKV comes out with the main track and the extras dropped.
How to convert MKV to MP4
- 01
Add your MKV file
Drop it in, or pick it from your device. Free uploads go up to 1 GB per file.
- 02
Choose MP4
Pick the output format from the list. Queue several files of the same type to batch them.
- 03
Download
Watch progress live, then download the result. No watermark, on any plan.
Other conversions
Frequently asked
How do I convert MKV to MP4 for free?
Open the GrumpTools File Converter, add your MKV file, choose MP4 as the output and download the result. It runs in the browser, output is never watermarked, and free uploads go up to 1 GB per file.
Does converting MKV to MP4 reduce quality?
MKV supports multiple audio tracks and subtitle tracks in one file. MP4 handles that far less gracefully, so a multi-track MKV comes out with the main track and the extras dropped.
Can I convert several MKV files at once?
Yes. Queue multiple files of the same type and convert them in one batch, then download them individually or all at once.