MP4 to MKV Converter

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Upload Video

Drag & drop or click to select a video file

  1. Upload an MP4 file.
  2. Optionally trim the time range.
  3. Click Convert and wait for completion.
  4. Download the MKV file.

Help

FAQ

Is this lossless?Show
The tool tries remux first. If it fails, it may transcode for compatibility.
Is my file uploaded?Show
No. The conversion runs locally by default.

How to convert MP4 to MKV

  1. Upload an MP4 file.
  2. Optionally trim the time range.
  3. Click Convert and wait for completion.
  4. Download the MKV file.

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Full guide

MP4 to MKV Converter

Convert MP4 videos to MKV/Matroska format for flexible container features.

Features

  • Matroska Container: Support for multiple audio/subtitle tracks
  • Lossless Remux: Fast container change without re-encoding
  • Time Trimming: Extract only the segments you need
  • 100% Local Processing: All conversion happens in your browser

Supported Formats

Input: MP4 video files

Output: MKV (Matroska)

Tips

  • MKV supports more features than MP4 (multiple audio tracks, subtitles)
  • MP4 to MKV usually works via fast remux (no quality loss)
  • Great for archiving with multiple audio/subtitle options