How to convert MKV to MP4
- Drop your MKV file on the box above or click the box to choose it.
- MP4 is already selected. Pick a quality, and trim the start or end if you need to.
- Click Convert and watch the progress bar. Files that can be copied without re-encoding are ready in seconds.
- Click Download to save the MP4 file.
Why convert MKV to MP4?
MKV (Matroska) is a flexible container that can hold almost any codec, several audio tracks and subtitles. It is popular for archiving, but many devices and editors don't open it.
MP4 is the most widely supported video format. With H.264 video and AAC sound it plays on every phone, computer, smart TV and website, and every social network accepts it.
Choose MP4 when the video has to play everywhere or be uploaded to a website or social network.
MKV and MP4 at a glance
| Format | MKV | MP4 |
|---|---|---|
| Type | Video | Video |
| Compression | Lossy | Lossy |
| Typical codecs | H.264, HEVC, VP9, AV1 … | H.264 / H.265 + AAC |
| Best for | a flexible archive format | video that plays on every device |
| Opens in | Some players and apps | Every device and app |
Good to know
- If the video inside the MKV is already H.264 or H.265, it is copied into the MP4 without re-encoding: the conversion takes seconds and loses no quality.
Questions about converting MKV to MP4
Is the MKV to MP4 converter free?
Yes. It is free, with no sign-up, no watermark and no limit on how many files you convert.
Is my file uploaded?
No. Your browser reads and converts the file on your own device; nothing is sent to 4Dev or anyone else.
Is there a size limit?
Files can be up to 500 MB. The result is built in your device's memory, so very large files are better converted on a computer than on a phone.
Will converting to MP4 reduce quality?
MP4 is lossy, so it drops detail that is mostly inaudible or invisible. The default settings are a good balance; choose a higher quality or bitrate for archiving.
Which browsers can do this?
Current Chrome, Edge, Safari and Firefox on a computer, and Chrome or Safari on a phone. The format list only offers what your browser can actually create.
Is this tool free?
Yes, it's free to use. No signup, no email required. Get results on this page.
How do I get my result?
Use the tool on this page. Your result appears here; no email delivery is required.