Convert MKV to MP4
Re-encode MKV containers into universally supported MP4 for TVs, phones and editing software.
- Your MKV file never leaves your device
- No sign-up, no watermark, no daily quota
- Handles files up to about 900 MB — your browser's memory ceiling
What happens when you convert MKV to MP4
Converts Matroska into MP4 so it plays on hardware that refuses MKV. Video is encoded with H.264 at CRF 23, audio to AAC at 128 kbps, and the result is written for progressive streaming. MKV can hold codecs MP4 cannot, which is why a straight container swap is not always possible and a re-encode is used.
Good for
- Playing downloads on a TV, games console or phone that rejects MKV
- Uploading to services that only accept MP4
- Standardising a mixed library into one format
Worth knowing
- MKV files are often long; a feature-length re-encode on a laptop can take a long while, and it all happens on your device.
- Only the first video and audio track are kept — alternate language tracks are dropped.
- Embedded subtitle tracks are not carried into the MP4.
MKV to MP4, answered
How do I convert MKV to MP4?
Drop your MKV file into the box above (or click to browse), make sure MP4 is selected as the target format, press Convert, then download the result.
Is this MKV to MP4 converter really private?
Yes. The conversion runs entirely in your browser — your MKV file is never uploaded to any server, so nobody but you ever sees it.
Is converting MKV to MP4 free?
Completely free — no watermarks, no sign-up and no daily quota. Processing happens on your own device, so there are no server costs to pass on to you.
Can I convert multiple MKV files at once?
Yes — drop as many files as you like. Convert them individually or use "Convert all", then download everything as a single ZIP.