How much can I compress a video without losing quality?

Screen recordings often shrink 50–80% with little visible loss, because large areas of the screen do not change. Try the Balanced level first and compare sizes before you download.

Is this video compressor private?

Yes. Compression runs in your browser with ffmpeg.wasm. Nothing is uploaded to a server.

How do I compress a video for email?

Most email providers cap attachments at about 20–25 MB. Compress the MP4 here, check the new size, and attach it, or lower the resolution if it is still too large.

Free tools

Free in-browser video compressor

To compress a video online, drop the MP4 below, pick a compression level, and download the smaller file. It runs in your browser, so large recordings for email, Slack, or web uploads never go to a cloud converter.

Processing happens entirely on your machine. We show the original and compressed sizes so you can decide if the tradeoff looks right before you keep the result.

Recording demos on Mac? Capture in Glisio first, polish in the local editor, then compress here if you still need a lighter file.

Your files never leave your browser

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Video Compressor FAQ

How much can I compress a video without losing quality?: Screen recordings often shrink 50–80% with little visible loss, because large areas of the screen do not change. Try the Balanced level first and compare sizes before you download.
Is this video compressor private?: Yes. Compression runs in your browser with ffmpeg.wasm. Nothing is uploaded to a server.
How do I compress a video for email?: Most email providers cap attachments at about 20–25 MB. Compress the MP4 here, check the new size, and attach it, or lower the resolution if it is still too large.