MKV to MP4 converter
To convert MKV to MP4, drop your MKV file in the box below. It converts straight away; press Download to save the MP4. It all happens in your browser, so your file stays on your device.
Convert to
Converted on this device, never uploaded
What changes
| MKV to MP4 | What happens |
|---|---|
| Picture | H.264 or HEVC copied as it is; VP8, VP9 and AV1 re-encoded as H.264 |
| Sound | AAC copied; Opus, Vorbis, FLAC and MP3 re-encoded as AAC |
| Tracks | The main picture and sound track; subtitles and extra languages are left out |
| Trim | Choose the part to keep on the timeline |
| Where it happens | In your browser; the file is never uploaded |
How to convert MKV to MP4
- Add your MKV. Drop the file in the box, or click to choose it. It becomes MP4 straight away.
- Check the result. Look at the preview and the size. The defaults are right for most files.
- Download. Press Download to save the MP4.
Why MP4
MKV files hold almost anything, but many TVs, phones and editors will not open them. MP4 plays nearly everywhere.
Questions
When the MKV holds H.264 with AAC sound, yes: both are copied unchanged, in seconds. Other codecs are re-encoded.
Only where the browser can decode that sound so it can be re-encoded as AAC; most cannot, and you will see a message naming the codec.
They are not copied: the MP4 gets the main picture and sound track only.
No. The conversion happens right in your browser, so your file stays on your device. There is no account to make, either.