Compress MKV files

Upload an MKV file and shrink its size by re-encoding the video at a lower bitrate. Re-encoding long videos takes a while, so keep the tab open.

Quality

Trimming the fat from Matroska files

Screen recorders and capture tools writing MKV often default to very high bitrates. Re-encoding at a sensible rate can cut sizes by half or more while looking identical for screen content, all without the file leaving your browser.

Frequently asked questions

Are OBS recordings good candidates?

Excellent ones. Screen and gameplay capture bitrates are set for safety, not efficiency; recordings typically compress dramatically.

Do multiple audio tracks survive?

The primary track is carried through compression. To pick a particular track first, use the select audio track tool.

Local processing?

Yes, no uploads regardless of file size.