Video Converters
MKV to MP4
Runs in your browser when it can; large or unusual files use our EU server and are deleted within 1 hour.
Drop MKV files here
or click to browse · paste from clipboard · up to 8000 MB each
Select filesOptions
Why convert MKV to MP4
Most MKVs contain H.264 or HEVC video and AAC or AC-3 audio, all of which MP4 can hold. Remuxing copies those streams into an MP4 in a fraction of the play time, and the picture is bit-for-bit identical.
MP4 cannot carry everything MKV can: DTS and TrueHD audio are converted to AAC, and text subtitles are either converted to MP4-compatible tracks or dropped. VP9 or AV1 video in MKV is re-encoded to H.264 for maximum compatibility.
How it works
- Drop MKV file onto the box above, click it to browse, or paste from the clipboard.
- Adjust the options if you need to — the defaults suit most cases.
- Press Convert. Small files are handled on your device; larger ones are sent to our server with a progress bar.
- Download the MP4 — individually or all at once.
About the formats
MKV · Matroska video · .mkv
An open container that can hold any codec plus multiple audio tracks, subtitles and chapters; popular for rips and downloads, unsupported by iPhone and many TVs.
- MKV to MP4 keeps the video quality when the codec is H.264 or HEVC — only the container changes.
- MP4 cannot carry every MKV feature: soft subtitles and some audio codecs (e.g. DTS) must be converted or dropped.
- Most desktop players (VLC, MPV) play MKV; Safari, iOS and PowerPoint do not.
MP4 · MPEG-4 Part 14 video · .mp4
The video format that works everywhere: phones, TVs, browsers, social networks. Normally H.264 video with AAC audio.
- MP4 is a container; the codec inside (H.264, HEVC/H.265, AV1) decides what can play it.
- H.264 MP4 is the safe choice for uploads and sharing; HEVC MP4 from newer iPhones needs extra codecs on Windows.
- The “moov atom” placement decides whether a browser can start playing before the whole file downloads.
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