iPhones, many smart TVs, and most video editors do not open MKV.
Video Converter
MKV to MP4
Make an MKV play on phones, TVs, and editors by converting it to MP4. When the MKV holds H.264 or HEVC video, it is repackaged in seconds with no quality lost.
Reads the codecs first, so it only re-encodes when it truly has to.
- Nothing is uploaded
- Instant when the streams fit
- Files up to 500 MB
- Add a file
- Pick a format
- Save
Drop an MKV file
MP4 · MOV · MKV · WebM · AVI · MP3 · M4A · WAV · up to 500 MB
Free, no signup. Converted on your device.
Why it helps
Why convert MKV to MP4
MP4 uploads to every social site and messaging app.
A repackage is lossless and takes seconds.
How to use it
How to convert MKV to MP4
1 Drop the .mkv file in. MP4 is already picked.
2 See whether it will be a repackage or a re-encode before you start.
3 Convert and save the .mp4.
Quick tips
MKV to MP4 tips
Sound that MP4 cannot hold, like FLAC or Opus, is converted to AAC while the video is still copied.
Subtitles inside the MKV are not carried over.
Files up to 500 MB work; trim long ones in the Video Editor first.
FAQ
MKV to MP4 questions
Is MKV to MP4 lossless?
Usually, yes. The video stream is copied unchanged when it is H.264, HEVC, or AV1.
What happens to multiple audio tracks?
The first audio track is kept, which is normally the main language.
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