Private video tool
Compress Video
Shrink MP4, WebM, or MOV video locally and download a browser-friendly MP4. Choose one of three quality presets and keep the file on your device.
File
No video selected yet.About browser video compression
This tool runs locally in your browser with ffmpeg.wasm. It re-encodes video to H.264 MP4, caps wide sources at 1280 pixels, and keeps audio at a practical AAC bitrate.
The first media operation in a tab downloads the roughly 31 MB engine once. In-browser encoding is best for short clips because browser memory and CPU speed are the real limits.
Does this upload my files?
No. Everything on this page runs locally in your browser, so your files are never uploaded to a conversion server. Close the tab and nothing is left behind.
After any required processing engine has loaded, repeated conversions can keep working offline. You can verify the claim with the site's reproducible browser privacy audit.
FAQ
Is my video uploaded?
No. The selected video is decoded, compressed, and downloaded locally inside your browser.
Why does the first run download an engine?
Video compression uses ffmpeg.wasm. The browser downloads the roughly 31 MB engine once, then reuses it while the tab is open.
Will the page show how much smaller the video is?
Yes. The file card shows the original size and the compressed output size after the MP4 is ready.
Is this good for long videos?
It is best for short clips. Browser video encoding can be slow, and very large files use a lot of memory.