runs 100% in your browser
Compress an MKV file
Free, in your browser, nothing uploaded. Drop the file, press the button.
MKV (Matroska) is what OBS and many rippers output, often at capture bitrates that produce gigantic files. ShrinkClip reads MKV natively in the browser and re-encodes it to a compact, widely-playable MP4 — locally, with nothing sent anywhere.
uses your device's built-in video encoder · nothing to install · no file ever leaves your browser
No upload queue
Compression runs on your own CPU. A 500 MB recording never crawls up your connection to someone's server — there's nothing to upload, wait on, or trust.
No command line to learn
The same H.264 encoding professionals tune by hand — with the bitrate math and resolution worked out for you. Pick a size, press the button.
Private by default
Your video is processed in browser memory and discarded when you close the tab. We never see a frame of it — only anonymous size and preset stats.
Questions people actually ask
Can browsers even open MKV files?
For playback, often not — but ShrinkClip parses the container directly, so it reads MKV even when your <video> player can't, and hands back a standard MP4.
Is MKV or MP4 better for sharing?
MP4 — it plays on virtually everything, while MKV support is patchy outside dedicated players. That's why the output here is always MP4.