Convert MKV to MP4
Convert your MKV video to MP4. Free, instant, private — nothing is uploaded.
Drop your MKV video here, or click to browse
Converts MKV to MP4 — .mkv files only
Related tools
Why use PixelTools to convert mkv to mp4
Clean MKV to MP4 conversion
Tries a fast stream copy first — repackaging MKV's existing video and audio into a MP4 container with zero quality loss — and only re-encodes if the source codec truly requires it.
100% private — no upload
Conversion runs entirely in your browser using WebAssembly. Your MKV file is never sent to a server, stored, or seen by anyone but you.
No account, no watermark
Free to use with no sign-up, no file limits, and no watermark on the output.
Why convert to MP4
The one format virtually every phone, editor, platform, and TV accepts without question.
Works on any device
Fully responsive with touch-friendly controls — convert files from your phone, tablet, or desktop without installing anything.
Safe for sensitive footage
Because nothing leaves your device, this is safe to use on personal recordings, unreleased footage, or clips you can't upload to a third-party server.
Three steps to convert mkv to mp4
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Drop your MKV video
Drag and drop your MKV file onto the page, or click to browse. Nothing is uploaded — the file stays on your device.
- 2
Conversion runs in your browser
A WebAssembly build of ffmpeg re-containers or re-encodes the video to MP4 entirely on your device. A progress bar shows the conversion as it runs.
- 3
Download your MP4 file
Preview the result right on the page, then click Download to save the MP4 file to your device.
Who converts MKV to MP4?
Whether you're a video editor, a content creator, or just need one clip in a different container — PixelTools converts MKV to MP4 instantly in your browser, with no upload and no account needed.
Working with downloaded rips, torrents, and open-source video tooling
MKV files typically come from downloaded rips, torrents, and open-source video tooling. Converting to MP4 makes them usable in the apps and platforms that actually need them.
Publishing or sharing as MP4
The one format virtually every phone, editor, platform, and TV accepts without question, which is exactly why people convert MKV to MP4 before sharing, uploading, or editing.
Editing and production workflows
Video editors and producers convert MKV to MP4 to match the container their NLE, platform, or client actually expects.
Fixing playback on the destination device
A MKV file that won't open on a phone, TV, or web uploader often just needs its container swapped to MP4 — no other editing required.
Frequently asked questions
Is the MKV to MP4 converter free?
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Yes, completely free with no limits. Convert as many files as you want. No subscription, no account, no watermark.
Does this tool upload my video to a server?
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No. The conversion happens entirely in your browser using WebAssembly. Your MKV video never leaves your device.
Why convert MKV to MP4?
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MKV is an open container that can wrap almost any video and audio codec combination, typically from downloaded rips, torrents, and open-source video tooling. The one format virtually every phone, editor, platform, and TV accepts without question.
Will the video quality change?
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This conversion tries a fast stream copy first, which repackages the exact same video and audio into a new container — no quality loss at all when the copy succeeds. If the source uses a codec that can't be repackaged directly, it automatically falls back to a full re-encode at a high-quality setting, which is only very rarely visible to the eye at typical viewing sizes.
Is there a file size limit?
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Files up to 2GB are supported. Very large files take longer to process since everything runs on your device's CPU rather than a server.
Can I use the converted MP4 file commercially?
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PixelTools does not claim any rights over files you process. The output is yours to use however you like, subject to any rights the original file's owner holds.
I downloaded an MKV file and my phone won't play it — why?
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MKV is an open container popular with torrents and open-source ripping tools because it can wrap almost any codec combination, but iOS, most Android gallery apps, and many smart TVs never added MKV support at all. Most MKV files already carry standard H.264/AAC streams internally, so this converter usually just repackages the same video and audio into an MP4 wrapper — a fast stream copy — rather than needing a slow re-encode.
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