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Video format · .mkv

MKV: what it’s for

MKV (Matroska) is the open, feature-rich container for serious video libraries: multiple audio tracks, embedded subtitles, chapters, and attachments in one file. Rips, anime collections, and archives live in MKV — convert to MP4 when a device or platform refuses it.

Strengths

  • Open and free — multiple audio tracks, subtitles, and chapters in one file
  • The archival choice: remux without re-encoding to keep every pixel
  • Our FFmpeg tools read MKV locally and transcode to MP4 or MP3
  • Handles codecs MP4 cannot pair, from FLAC audio to ASS subtitles

Honest limits

  • Poor native support on TVs, consoles, and Apple devices — MP4 for playback
  • Social platforms reject MKV uploads; convert to MP4 first
  • Multi-track files transcode slower — the converter processes the selected tracks
  • Very large rips (tens of GB) strain mobile browsers; use a desktop

Free MKV tools

Every tool runs in your browser — files never leave your device. Badges say exactly what each tool does with MKV.

MKV FAQs

How do I play an MKV on my TV or iPhone?

Convert it to MP4 with the video converter — transcoding runs locally via FFmpeg and the result plays on virtually everything.

Can I extract subtitles or audio from MKV?

Audio extraction to MP3 works locally. For subtitle tracks, the converter keeps them when the output container supports them.

Does converting MKV to MP4 lose quality?

Re-encoding sheds a little detail, like any transcode. For maximum fidelity keep the MKV as your archive and convert copies for playback.

Is MKV conversion private?

Completely. Transcoding runs in your browser with local FFmpeg; no video is uploaded.