Compress MKV
Free, fast and secure — shrink your MKV file right in your browser.
MKV
Shrink your MKV for easy sharing and upload
Compressing MKV re-encodes your video at the size you choose, cutting the file down dramatically so it uploads quicker, fits attachment limits and streams smoothly — while keeping it looking sharp.
How to compress MKV
- 1 Drop your MKV file into the compressor above.
- 2 Pick a compression level and it is optimised automatically.
- 3 Download your smaller MKV file instantly.
About MKV
MKV
Matroska video
MKV (Matroska) is a flexible open container that can bundle many video, audio and subtitle tracks in one file. It is popular for high-quality archives and media libraries.
Strengths
- Holds multiple audio/subtitle tracks
- Open and future-proof
- Great for high-quality storage
Limitations
- Not supported on many phones/browsers
- Often needs converting to play
- Larger than streaming formats
Best for: Archiving high-quality video with multiple tracks — converted to MP4 for everyday playback.
Frequently asked questions
Upload your MKV file above, pick a compression level and it is optimised automatically. When it is ready, download your smaller file — the whole thing takes just a few seconds in your browser.
You choose the balance between size and quality. “Light” keeps the video close to the original, while “Strong” maximises the saving. Even strong compression stays perfectly watchable.
It depends on the file and the level you pick, but savings of 40–80% are common — larger, less-optimised files shrink the most.
Yes. The compressor is free to use, with no watermark and no sign-up required.
Your files are processed securely and are never shared with anyone.