MKV Compressor
Shrink MKV files without wrecking them: free, in your browser, gone within the hour.
One file at a time for now
Batch processing isn't available yet: drop files one by one, or use the Merger to join them.
Try another file- Free, no signup
- No watermark, ever
- Files auto-delete in 1 hour
- Nothing to install
MKV is the format that hoards: video, a dozen audio tracks and every subtitle, all in one box. The Matroska container: it will hold practically any codec ever made.
- Born
- 2002, the open-source Matroska project
- Type
- video · container
- Typical size
- as big as whatever you put inside: movie files often run to several gigabytes
- Plays on
- VLC and desktop players love it; smart TVs, Apple devices and editors often don't.
- Fun fact
- Matroska is named after matryoshka nesting dolls: a container built to hold containers.
What compressing MKV actually does
Compressing MKV means re-encoding the video inside with a modern codec at a quality you choose: low, medium or high. Camera footage typically gives up 30–70% of its size before quality visibly suffers, and screen recordings squeeze even harder. MKV runs as big as whatever you put inside: movie files often run to several gigabytes, so there's usually plenty to give.
How to compress an MKV file
-
1
Drop your MKV into the compressor above.
-
2
Pick a quality level: medium is the sweet spot most people can't tell from the original.
-
3
Download the smaller file. MKV typically runs as big as whatever you put inside: movie files often run to several gigabytes, so the savings are real.
Questions people ask
How much smaller will my MKV get?
It depends on how generously it was encoded: MKV typically runs as big as whatever you put inside: movie files often run to several gigabytes, and most files give up 30–70% at the medium preset before quality visibly suffers.
Will I lose quality working with MKV here?
Where possible Flippy copies streams without re-encoding; when a re-encode is unavoidable it happens once, at quality matched to your MKV.
Is this MKV compressor really free?
Yes: free for everyday use with no daily cap, no signup, and your files delete themselves from our servers within an hour.