Convert MKV to MP4
MKV holds the same video as an MP4 — it is only the wrapper that TVs, phones and iPads refuse. The video and sound are copied straight across, so a two-hour film is done in seconds and looks exactly as it did.
- Processed on your device
- No upload, no waiting
- No signup, no watermark
How it works
Add your MKV
Drop the file. You are shown what is inside: H.264 or HEVC video, and AAC, MP3, AC-3 or DTS sound.
Let it rewrap
The picture is copied without re-encoding. Dolby and DTS sound, which an MP4 player cannot handle, is converted to AAC.
Download the MP4
Plays on a TV, an iPad, a PlayStation and in every editor.
Frequently asked questions
Is it really lossless?
For the picture, yes: the encoded video is copied byte for byte into the new container, so it is identical. Sound is copied too when it is AAC or MP3; AC-3, E-AC-3 and DTS have to be converted, because MP4 players do not play them.
Why is it so much faster than other converters?
Because nothing is decoded or encoded when the video can simply be copied. Tools that re-encode everything spend an hour making a film look slightly worse; this copies it in seconds.
Is my film uploaded?
No — which matters most here, because films are large. Nothing is sent anywhere, and the output is written to your device's own storage as it goes, not held in memory.
What happens to subtitles and extra languages?
They are left out, and the result says how many tracks were dropped. MKV was designed to hold many tracks and MP4 was not, so if you need the subtitles, keep the MKV and play it in VLC.
My MKV plays with no sound after converting elsewhere.
That is the Dolby Digital problem: the sound was copied into a container whose players cannot decode it. Here that sound is converted to AAC, so you get sound everywhere.
What about HEVC (H.265) files?
They are copied across as HEVC, which modern Apple devices, TVs and recent Windows play. If you need maximum compatibility, choose "Convert to H.264" and it is re-encoded instead.
Good to know: Only the first video and sound track are kept. Chapters, tags and attached fonts or covers are not carried into the MP4.