Is my video uploaded?

No — compression runs in your browser with WebAssembly FFmpeg, so the file stays on your device.

Why is the first run slow to start?

The video engine (~31 MB) downloads once on first use, then is cached for next time.

Which formats are supported?

Common formats like MP4, MOV, MKV and WebM.

You choose the trade-off — lighter compression keeps more quality, heavier compression makes a smaller file.

Compress Video

Reduce video file size with WebAssembly.

100% private — runs in your browser, no upload

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Compress video to a smaller file without uploading it — VuConvert runs FFmpeg directly in your browser (via WebAssembly), so your footage never leaves your device. Drop in an MP4 or MOV, choose how much to compress, and get a smaller file to email, upload or store.

How to compress video

1.Drop a video file into the box above.
2.Pick a quality/size target.
3.VuConvert re-encodes it locally with in-browser FFmpeg.
4.Download the compressed video.

Frequently asked questions

Is my video uploaded?: No — compression runs in your browser with WebAssembly FFmpeg, so the file stays on your device.
Why is the first run slow to start?: The video engine (~31 MB) downloads once on first use, then is cached for next time.
Which formats are supported?: Common formats like MP4, MOV, MKV and WebM.
Will quality drop?: You choose the trade-off — lighter compression keeps more quality, heavier compression makes a smaller file.