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MKV to MP4Free MKV to MP4 converter for Windows
Convert MKV to MP4 on Windows — no software to install
Most Windows video editors, PowerPoint, and sharing platforms reject MKV files even when the video inside is plain H.264. Instead of installing HandBrake or wading through VLC's export menus, drop the file here — it is repackaged into an MP4 right in your browser, usually in seconds and with zero quality loss.
Up to 20 files of 1.5 GB each per batch. No .exe, no installer, no upload — your videos never leave your PC.
- No install
- Works in Edge & Chrome
- No quality loss
- No upload
- No signup
Files are processed on your device with FFmpeg compiled to WebAssembly — nothing is uploaded, logged, or stored.
How to convert MKV to MP4 on Windows
Three steps in the browser your PC already has — no downloads, no uploads.
Open this page in Chrome, Edge, or Firefox
No .exe to download, no installer to run — the converter is FFmpeg compiled to WebAssembly and runs inside the browser your PC already has. The first visit fetches a one-time ~31 MB engine that gets cached for later.
Drag your MKV files in from File Explorer
Drop up to 20 Matroska (.mkv) files, up to 1.5 GB each, straight from File Explorer into the zone above. The tool inspects each file and picks the fastest path: H.264, H.265/HEVC, and AV1 video is copied into the MP4 container bit-for-bit, so most files finish in seconds with zero quality loss.
Download and play in any Windows app
Preview any finished file right on the page, then save it to your Downloads folder — one by one or all at once. The resulting MP4 opens in Movies & TV, Windows Media Player, imports into video editors like DaVinci Resolve or Premiere Pro, and plays on any device. Everything was processed locally; nothing was uploaded.
This tool vs HandBrake vs VLC on Windows
The standard Windows advice for MKV files is "install HandBrake" or "use VLC". Both work — but both are transcoders first, and repackaging a container is a much smaller job than re-encoding video.
| This tool | HandBrake | VLC | |
|---|---|---|---|
| Install required | None — runs in the browser | Yes — .exe installer | Yes — .exe installer |
| Lossless by default | Yes — remux for H.264/HEVC/AV1 | No — always re-encodes | No — re-encodes unless you build a custom profile |
| Typical time (2 GB file) | Seconds | 10–40 minutes | Minutes (re-encode) or seconds (manual stream copy) |
| Text subtitles kept | Yes — converted to MP4 timed text | Burn-in or soft subs, configured per rip | Often lost in Convert mode |
| Privacy | Local — nothing uploaded | Local | Local |
HandBrake and VLC are excellent free apps — if you need to shrink a file or change codecs, use them. If you just need an MKV to play everywhere or import into an editor, a remux is faster and lossless.
MKV to MP4 on Windows — questions
Can Windows play MKV files natively?
Partially. The Movies & TV app on Windows 10/11 handles MKV files with H.264 and H.265 video, but many other programs do not — older Windows Media Player, most video editors, PowerPoint, and many sharing platforms reject the Matroska container. Converting to MP4 makes the file universally compatible across Windows, macOS, iOS, Android, and the web.
Do I need to install anything on Windows?
No. Unlike HandBrake, VLC, or paid converter apps, this tool has nothing to download or install — no .exe, no setup wizard, no UAC prompt. It runs entirely inside Chrome, Edge, or Firefox, and keeps working offline once the page has loaded.
Does it work in Microsoft Edge?
Yes. Edge, Chrome, Firefox, and Brave on Windows all run the WebAssembly conversion engine. Any Windows 10 or 11 PC with a current browser will work — no special extensions or plugins required.
Is the conversion fast on Windows?
For H.264, H.265/HEVC, and AV1 sources the tool performs a remux — a stream copy with no re-encoding — so most files finish in seconds regardless of length. The speed is limited by disk I/O, not CPU power. Only VP8/VP9 files require re-encoding, which takes longer but is uncommon.
Will the converted MP4 work in DaVinci Resolve and Premiere Pro?
Yes. H.264 and H.265 MP4 files import directly into DaVinci Resolve, Adobe Premiere Pro, and other NLEs on Windows. MKV files are often rejected by these editors even when the codecs inside are identical — the container is the only difference.
Can't VLC or HandBrake convert MKV to MP4 on Windows?
They can, but both re-encode the video by default, which takes minutes instead of seconds and reduces quality by one generation. VLC's stream-copy mode requires editing a custom profile, and HandBrake always re-encodes — there is no passthrough option. This tool does the lossless stream copy by default and converts text subtitles to MP4's native format automatically.
Does converting reduce the video quality?
No — for H.264, H.265/HEVC, and AV1 video the streams are copied into the MP4 container untouched, so the output is bit-identical to what was inside the MKV. Re-encoding only happens for codecs MP4 players cannot handle, such as VP8/VP9 video, and the tool labels which path it took for every file.
Are my videos uploaded anywhere?
No. The entire conversion runs on your PC, inside the browser tab — there is no upload endpoint, no queue, and no server-side copy of your video. Disconnect from the internet after the page loads and conversions keep working.
Why MKV causes problems on Windows
MKV (Matroska) and MP4 are containers — wrappers around compressed video and audio streams. While Windows 10 and 11 added basic MKV playback in the Movies & TV app, the rest of the ecosystem lags behind: Windows Media Player (classic), most video editors including Adobe Premiere and DaVinci Resolve, Microsoft Office (PowerPoint), and nearly every social platform or messaging app reject MKV outright.
Because the streams inside are usually H.264 or H.265/HEVC — codecs every Windows app handles — the fix is not converting the video at all, just moving it between containers. That is what this page does, using FFmpeg compiled to WebAssembly inside your browser: a lossless remux for compatible codecs, and an automatic re-encode only for the rare MKV carrying VP8/VP9 video or DTS audio.
This is the same engine as the main MKV to MP4 converter — same 20-file batches, same 1.5 GB per-file limit, same privacy model: everything runs on your PC, and nothing is ever uploaded.
Your videos never leave your PC
Every conversion runs locally through WebAssembly FFmpeg. We never receive, store, or even see a byte of your video — there is no upload endpoint to send it to. Close the tab and nothing about your files persists anywhere.