MKV to MP4.
H.264 copied, not re-encoded.
Upload an MKV and get an MP4 that plays on phones, computers and in every browser — with its own link.
Drop photos, videos or files here — or paste an image with Ctrl+V
Your links
Download a video
Download only what you have the right to use. Files stay on BasePic for one hour.
How it works
- Upload the MKV
Tap Upload video and pick the MKV, up to 2 GB.
- Trim if you like
The editor opens with the whole video. Keep it all, or drag the handles to cut the start or the end.
- Convert
Tap Convert to MP4. The MP4 gets its own link and a Download button; your MKV stays as it was.
H.264 MKV: copied, not re-encoded
Most MKV files, including OBS recordings, hold H.264 video. It is copied into the MP4 as it is — quick, and the picture is exactly the same.
Other video formats
HEVC (H.265), VP9, AV1, MPEG-2 and other formats are re-encoded to H.264 at good quality, with the same size in pixels. Re-encoding works on videos up to 15 minutes long at 1080p or 4K, up to 33 minutes at 720p, 1 hour 15 minutes at 480p and 2 hours at 360p or smaller.
Sound
When the picture is copied, AAC and MP3 sound is copied with it. Opus, Vorbis, AC-3, FLAC and other sound becomes AAC, which every phone and browser plays.
One video and one sound track
The MP4 gets the first video track and the first sound track of the MKV. Subtitle tracks and other sound tracks are not carried over — to add subtitles, use Add SRT to video.
MKV to MP4: questions
How do I convert an MKV to MP4?
Upload the MKV and tap Convert to MP4. The MP4 gets its own link and a Download button.
Will the quality change?
Not for an MKV with H.264 video — it is copied as it is. Other formats are re-encoded to H.264 at good quality.
Are subtitles kept?
No. Only the first video track and the first sound track go into the MP4. You can add an .srt file again with Add SRT to video.
How big can the file be?
Up to 2 GB. An H.264 MKV is copied quickly; one that needs re-encoding can be up to 15 minutes long at 1080p or 4K, 33 minutes at 720p, 1 hour 15 minutes at 480p and 2 hours at 360p — trim a longer one first.
Is it free?
Yes. No sign-up and no watermark.