Compress Video
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No. The file is read and re-encoded inside your browser using WebCodecs, so the video itself never leaves your device. The only thing ever fetched from the network is the software encoder used as a fallback, and even then your video stays local.

Not exactly. This compressor works from a quality level rather than a fixed target, but every level shows its expected output size before you start. Pick Strong or a lower resolution until the estimate sits comfortably below your limit.

Making a video substantially smaller normally requires discarding some data, so completely lossless size reduction is not always possible. Basic keeps the most detail; Balanced is a good default for sharing.

It means the browser accepted a request for hardware encoding on this device. It does not identify your GPU, and the encode may still run on an integrated media engine or in software. The capability report shows the measured speed either way.

Only if you ask for it. Leave the resolution on Original to keep the source dimensions and reduce bitrate alone. For a much smaller file, lowering resolution usually gives a better balance between size and sharpness.

MP4, MOV, WebM, MKV, AVI and other popular container formats can be read, as long as your browser can decode the video track. The output is always H.264 MP4.

Yes. Open the compressor in your mobile browser and choose a video from your device. On browsers without WebCodecs support the software fallback is used, which is slower but still runs entirely on the phone.

Because the encode is running on your own hardware. When hardware encoding is unavailable the work falls back to software, which is far slower. The scope above shows the real frames-per-second measured on your machine.

Compression reduces file size by changing encoding settings such as bitrate. Resizing changes the frame dimensions. This tool can do both — independently or together.