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Matroska Video Converter

Convert an MKV Container to MP4

Need to use Matroska Video Converter right now?

Primary video and audio tracks carry over; secondary tracks or subtitles from the MKV don't.

No sign-upNo uploads 100% free

Drop a video file, or click to browse

Processed locally in your browser — never uploaded

MKV supports far more codecs than most devices actually play — this re-encodes to standard H.264/AAC MP4 for universal compatibility, entirely in your browser.

Features

  • Runs entirely in your browser
  • Privacy-first — your data is never uploaded
  • Real-time, instant results
  • 100% free, no sign-up required
  • Works on desktop, tablet, and mobile
  • No installation needed

Who uses this tool?

Content creatorsVideo editorsSocial media managersMarketers

People also search for

MKV to MP4MKV Video to MP4Convert MKV VideoMatroska to MP4MKV File Converter

About Matroska Video Converter

MKV (Matroska) is a flexible container format that supports far more codecs, subtitle formats, and multiple audio tracks than most devices actually know how to play — it's popular for archiving and advanced media libraries precisely because of that flexibility, but that same flexibility is exactly what makes MKV files fail to open on phones, smart TVs, and many web platforms. Converting to MP4 trades some of that flexibility for near-universal playability.

A real FFmpeg build compiled to WebAssembly handles the conversion entirely inside your browser, decoding whatever video and audio codecs the source MKV actually uses (which can vary widely, since MKV places no real restriction on codec choice) and re-encoding to standard H.264 video and AAC audio in an MP4 container.

Because MKV files can contain codecs, multiple audio tracks, or subtitle formats that MP4 simply can't hold, this conversion selects the primary video and audio tracks and re-encodes them into the more restrictive but far more compatible MP4 structure — any secondary audio tracks or embedded subtitle streams from the source MKV are not carried over.

The trade-off is straightforward: MKV's extra flexibility for multiple tracks and advanced features is given up in exchange for a file that opens correctly on essentially any device or platform, which is usually exactly the trade a user reaching for this tool wants to make.

How it works

  1. Upload your MKV file. The file loads into the browser-based FFmpeg engine.
  2. Conversion runs locally. FFmpeg decodes and re-encodes to H.264/AAC MP4.
  3. Download the MP4. A widely compatible video file, ready to play anywhere.

Examples

Making an MKV file playable on a phone

Input

movie.mkv with an uncommon codec

Output

an MP4 file that plays on any modern phone

Frequently asked questions