Free Online MKV Compressor
Reduce the file size of your MKV recordings directly in your web browser for free without installing anything. Shrink massive screen captures so they are light enough to share and store.
Over 500,000 creators use Flixier every day including brands like:
Posting to social media?
Making gaming content?
Marketing a product?
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.
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
Everything you need to create and finish AI videos
Still have questions?
We got you!
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.
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.
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.
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.
If you are working with other files, there is a dedicated MP4 compressor, MOV compressor, and WebM compressor, covering the exact same job.
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Free up hard drive space and make your video files light enough for email attachments or chat apps in just a few clicks.
