Compress Video
Shrink a video's file size right in your browser by re-encoding it with H.264. No upload, no watermark, no sign-up — your file never leaves your device.
Drop a video here, or click to choose
Processed on your device · nothing is uploaded
processed on your device · nothing is uploaded
How to compress a video
Drop your video onto the box above (or click to choose it). The converter loads once (~32 MB) on first use, then re-encodes the video in your browser with H.264. A progress bar tracks the work, and a Download button gives you the smaller file.
Why compress in the browser?
Uploading a big video to a compression site is slow and exposes your file to a third party. ffmpeg.wasm does the whole re-encode locally, so your video stays on your device and you skip the upload entirely.
Questions
Is it private — does my video get uploaded?
Yes, it's private: compression runs entirely in your browser with ffmpeg.wasm. Your video is never uploaded to or stored on a server — everything happens on your own device.
Is there a file size limit?
There's no hard cap, but ffmpeg.wasm runs in browser memory, so large files (roughly over 150 MB) are slow and may run out of RAM. Compression also takes longer than a native app because it re-encodes the whole video frame by frame.
How much smaller will the video be?
We re-encode at CRF 30 with the H.264 codec, which typically cuts file size by half or more with little visible quality loss — ideal for email limits, messaging apps, and faster uploads.