Compress Video
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- Zero Server Data
Most videos are far larger than they need to be, usually because the camera that made them had to encode in real time and could not stop to think. Re-encoding one with the time to do it properly typically cuts it to a third or less at the same size, and a good deal further if you also drop the resolution. This does that work in your browser, using the same video codecs it already uses to play video, so nothing is uploaded and nothing is installed. The soundtrack is copied across untouched.
1 · Your video
2 · Size and quality
A smaller picture saves far more than a lower quality does. Dropping 1080p to 720p removes more than half the pixels before the quality setting has said a word.
Frequently asked questions
Is my video uploaded anywhere?
No. The whole job happens in the tab: your browser reads the file, decodes it, encodes a new one and hands it back. The site’s security policy sets connect-src ‘none’, so the browser blocks network requests from these pages, so the video could not be sent even if the code tried. Nothing is queued on a server and nothing waits in a folder to be deleted later.
How much smaller will it get?
At the same picture size, usually a third to a half of what it was. Drop 1080p to 720p and you are removing 56 percent of the pixels before quality enters into it, so files of a fifth the original are ordinary. Footage that is mostly still, such as a screen recording or a talking head, compresses much further than footage full of movement.
Does the sound get worse?
No, because the sound is not re-encoded. It is already compressed, it is a small fraction of the file, and putting it through another encoder would cost quality to save almost nothing. The audio track is copied across exactly as it was.
Why does it take so long?
Because it is doing real work. Every frame has to be decoded to a picture, scaled and encoded again, and there are usually 25 or 30 of them per second of video. A phone or laptop does this at somewhere around real time, so a two-minute clip takes roughly a couple of minutes. Tools that finish instantly have sent the file somewhere else.
Which browsers can do this?
Chrome, Edge, Opera and Safari 16.4 and later. Firefox can decode but not yet encode, so the page will say so rather than pretend. This uses WebCodecs, which is the browser handing over the same video hardware it uses to play video.
Which files does it take?
MP4 and MOV holding H.264 video, which covers phones, cameras, screen recorders and most of what is on a hard disk. The result is always MP4. Formats built on a different container, such as MKV or AVI, are not read.
Can I stop it partway?
Yes, and stopping leaves nothing behind. There is no partial file to clean up and no job running somewhere after you close the tab, because there was never a job anywhere but here.