Online video compressor
Compress a video online without uploading it. It runs in your browser — no install, no account, no watermark — and your file never leaves your device.
Drop a video here, or browse
MP4 · MOV · WebM — compressed right here, nothing uploaded
100% on-device · no signup · no watermark
Loading compressor…
Bigger files take longer — your CPU does the work, privately.
Online — but your video stays on your device
Most online video compressors work the same way: you upload your file to their servers, wait while it processes, then download the result. That’s slow for big files, and it means your footage sits on someone else’s machine. This compressor is online in the way that matters — open a web page and use it instantly — but the compression itself runs in your browser. Your video is never uploaded.
The engine downloads once from a public CDN, then it works on your own device. After that you can even disconnect from the internet and keep compressing, which is the simplest proof that nothing is being sent anywhere.
Pick a target, get a smaller file
Choose a platform preset — Discord 10 MB, WhatsApp 16 MB, email 25 MB — or set an exact size, and the compressor works out the bitrate to hit it. The output is a standard H.264 MP4 that plays everywhere. Want to start from a format or goal instead? Try the MP4 compressor, the video size reducer, or compress without losing quality.
Frequently asked questions
Is this online video compressor free?
Yes — completely free, with no signup, no email and no watermark, and no per-file or per-day limit. There’s no server cost to recoup because the compression runs on your own device.
Does it upload my video to compress it?
No — and that’s the difference. Most online compressors upload your file to a server. This one compresses it in your browser with WebAssembly, so the video never leaves your device. You can even go offline after the page loads.
Do I need to install anything?
No. It runs in any modern browser on desktop or phone — nothing to download or install. That’s what makes it “online”: open the page and compress.
What formats can it compress?
MP4, MOV and WebM in; a standard H.264 + AAC MP4 out, which plays everywhere and uploads cleanly to Discord, WhatsApp, email and social platforms.
Is there a file size limit?
No fixed upload limit, because nothing is uploaded — the only real limit is your device’s memory. For very large files use a desktop browser with free RAM, or see the large video compressor.