MKV to MP4
Convert MKV videos to MP4 for phones, TVs, editors and every platform.
or drag and drop it here
No file chosen yet. Maximum size: 300 MB.
When possible the video is copied without re-encoding — instant and lossless.
Ready. Choose a file to start.
🔒 Runs 100% in your browser with FFmpeg — your file is never uploaded to a server. First use loads the converter engine (about 31 MB, cached in your browser afterwards). MKV files with H.264 video convert instantly by copying — no quality loss.
How to Use MKV to MP4
Follow these 3 simple steps to get started in seconds
Choose your file
Choose your MKV file (up to 300 MB).
Click Convert
Click Convert — when possible the video is copied without re-encoding, instantly.
Download your file
Download the MP4 when it is ready.
Why use this MKV to MP4 tool?
Designed for speed, privacy, and maximum efficiency without subscriptions
MKV is a great container that many players and editors still reject
MP4 just works.
Fast copy path keeps the original quality, with zero loss.
Fast copy path keeps the original quality, with zero loss.
Falls back to H.264 re-encoding automatically when copying is not possible.
Falls back to H.264 re-encoding automatically when copying is not possible.
100% private
nothing is uploaded, ever.
Frequently Asked Questions About MKV to MP4
No. Conversion runs entirely in your browser with FFmpeg. Your file never leaves your device.
The first use downloads the converter engine (about 31 MB). After that it is cached in your browser.
Usually not: when the MKV already uses H.264 video and AAC audio, it is copied as-is into MP4 — identical quality, in seconds.
This tool converts the main video and audio track. Subtitle and multi-track handling is not included in this version.
300 MB per file. For longer videos, a desktop browser handles conversion better than a phone.
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Ready to Use MKV to MP4?
MKV that will not play? Turn it into MP4 — free, private, no upload.