Convert MKV to MP4, free
MKV is a wonderful container that almost nothing outside VLC and desktops will play — iPhones refuse it, most TVs choke on it, QuickTime won't touch it. The fix is a straight remux-or-transcode into MP4: drop the file below with MP4 pre-selected, keep Original quality, and download a file that plays absolutely everywhere. Your video and main audio track carry over; conversion runs locally with hardware acceleration, so even big rips convert fast.
How to convert MKV to MP4
- 1Drop your MKV on the converter above. MP4 output is already selected.
- 2Keep Original quality unless you also want it smaller — then step to Balanced or Compact.
- 3Hit Convert and download. The MP4 plays on phones, TVs, consoles, and browsers with zero fuss.
MKV conversion notes
Video and main audio carry over
The primary picture and soundtrack are converted; extra subtitle tracks are not carried into the MP4.
HEVC sources still work
Many MKVs hold H.265 video — if your browser can't decode it, use the built-in compatibility conversion first.
Big rips take a bit
A 2GB file transcodes as fast as your hardware allows — watch the progress bar, don't close the tab.
Frequently asked questions
Why won't my MKV play on iPhone or TV?
Most built-in players only accept MP4/WebM containers. Converting the container (and codec if needed) to MP4 fixes it permanently.
Do I lose quality converting MKV to MP4?
Not on Original quality — and compatible streams are often copied through untouched rather than re-encoded.
What about subtitles?
Embedded subtitle tracks are not carried over — the picture and main audio are. Burned-in (hardcoded) subtitles are part of the picture and survive.
Are my files uploaded?
No. The whole transcode runs in your browser.