Online MKV Compressor
Reduce the file size of your MKV recordings directly in your web browser without installing anything. Shrink massive screen captures so they are light enough to share and store.
Over 1 million creators use Flixier every day including brands like:
How to Compress MKV Online
Shrink Heavy MKV Recordings
Compress Files Safely
Compressing never overwrites what you recorded. The source MKV stays on your drive exactly as it was, so you can run it again at a smaller target whenever you need a second version.
Handle Long Recordings
MKV is the default format for hour-long stream captures and webinars, which means the files are often massive. Compression brings gigabytes of footage down to a manageable size that actually fits into a chat window or an email.
Process Files Locally
Our video compressor decodes and processes the MKV on your own machine. Your footage is never sent to a Flixier server or stored in a cloud library, keeping your internal calls and unreleased builds completely private.
Shorten Upload Times
Home and office connections upload far more slowly than they download. Halve the size of a recording and you halve the time it takes to send, whatever speed you are on.
Everything you need to create
and finish AI videos
Who This Is For
Marketers
Shrink a webinar capture or a demo recording until it clears an email limit, so reviewers can open it and comment the same day.
See How It WorksEducators
Business Owners
Social Creators
Still have questions?
We got you!
How do I compress an MKV file for free?
Drop your video file into the compression tool in your web browser. Choose your preferred file size and quality settings, start the compression, and download the smaller file to your device.
Is there a file size limit when compressing MKV?
Flixier does not impose one. You can process massive multi-gigabyte files or hours of screen recordings, provided your device has enough memory to handle the video data during the compression process.
Will compression reduce my MKV quality?
Some quality is always lost because compression works by discarding data. Flixier targets the redundant information a viewer will not notice, leaving the visible picture as close to the source as possible. You control the exact trade-off by choosing the resolution.
Can I edit my MKV video before sharing it?
Yes. Open the compressed file in the Flixier editor to trim pauses, add text overlays, generate subtitles, or lay in an audio track. Export from there and the compression stays applied, so you are not shrinking the same recording twice.
What other video formats can I compress?
If you are working with other files, there is a dedicated MP4 compressor, MOV compressor, and WebM compressor, covering the exact same job.
