Compress MKV

OBS recordings and other MKV videos are often recorded at a high bitrate and take up a lot of space. This compressor re-encodes them efficiently with H.264 and keeps the MKV format, so they work as before in VLC, Plex and other players.

How to compress an MKV file

1. Upload your MKV video.
2. Choose the compression level and an optional resolution.
3. Click Convert and download the smaller MKV.

MKV compressor features

• Efficient H.264 video and AAC audio.
• Large OBS and game recordings usually shrink a lot.
• Keeps the MKV container.

How video compression works

Compression saves space by describing what changes between frames instead of storing every frame completely, and by removing detail that is hard to see. The compression level controls how much detail is removed. Recordings with lots of motion or fine detail, like games and sports, compress less than talking-head videos or screen recordings.

Frequently asked questions

Are subtitle and extra audio tracks kept?

The first video and the first audio track are kept. Extra audio and subtitle tracks are not included in the compressed file.

Why compress OBS recordings?

OBS often records at very high bitrates to keep quality during recording. Compressing afterwards can save a lot of space with little visible difference.

Can I upload the result to YouTube?

Yes. YouTube accepts MKV, but you can also convert to MP4 with MKV to MP4.

Is the tool free?

Yes, and there is no watermark.

Privacy, limits and file safety

Your files are processed on our own server, are never shared with anyone and are deleted automatically 60 minutes after processing. You can upload files up to 500 MB and 60 minutes long. No sign-up, no watermark and no software to install: it works in any modern browser on Windows, Mac, Android and iPhone.

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