Free browser tool
Free MKV to MP4 Converter
Convert MKV to MP4 in seconds — no upload, no sign-up, no watermark. Fast stream-copy for zero quality loss on most files. Everything runs privately in your browser.
- No upload
- No sign-up
- No watermark
- No quality loss
Drop a video here or click to browse
MOV, MKV, AVI, WebM → MP4 — converted locally in your browser
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See what it doesHow to convert MKV to MP4 online
Drop your MKV file
Select or drag in your MKV file. Processing is local — nothing is sent to a server.
Auto-convert
FFmpeg stream-copies the video into an MP4 container without re-encoding, preserving full quality at maximum speed.
Download MP4
Click Download. The MP4 is ready for any player, phone, smart TV, or video editor.
Why convert MKV to MP4?
Play on any device
MP4 is universally supported — phones, tablets, smart TVs, and game consoles. MKV often requires a third-party player like VLC.
Upload without issues
YouTube, Vimeo, social media, and most CMS platforms require MP4. MKV uploads are frequently rejected or silently re-encoded.
Open in any editor
Premiere Pro, Final Cut, DaVinci Resolve, and iMovie all support MP4 natively. MKV often requires a plugin or conversion step.
Smaller sharing footprint
MP4 with H.264 is optimised for streaming and progressive download. MKV files can be very large and slow to buffer remotely.
Frequently Asked Questions
How do I convert MKV to MP4 online for free?
Drop your MKV file into the converter or click to browse. Conversion runs locally in your browser — no upload, no sign-up, no watermark. Click Download when done.
What is an MKV file?
MKV (Matroska Video) is an open container format that can hold multiple video/audio tracks and subtitles. Popular for high-quality videos and gaming captures, but not widely supported by mobile devices, TVs, or editors without plugins.
Will I lose quality when converting MKV to MP4?
The converter tries stream copy first — remuxing without re-encoding, zero quality loss. If the codec isn't MP4-compatible it falls back to H.264 + AAC.
Is my video uploaded to a server?
No. Everything runs locally in your browser using FFmpeg compiled to WebAssembly. Your file never leaves your device.
Why won't my MKV file play on my phone or TV?
Most phones and smart TVs only support MP4 natively. Converting to MP4 makes the file play on virtually any device.
More Free Tools
Sponsored by the makers
Tired of boring screen recordings?
Try Screen Charm.
Auto-zoom, motion blur, camera overlay, and background music. All built in. Record once, export a polished video.
See what it does