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Runs locally WebCodecs Multiple presets

Video Compressor

Compress and convert video entirely in your browser — no uploads. WebM and experimental MP4 output with presets and custom parameters to balance quality and size.

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Privacy: All video processing runs locally in your browser. Videos are never uploaded to any server, keeping your data private and secure.

Technical References

  1. WebCodecs API — W3C / MDN: https://developer.mozilla.org/en-US/docs/Web/API/WebCodecs_API

Frequently Asked Questions

Do I need to install software to transcode videos?

No. The tool transcodes videos locally in your browser using the WebCodecs API — no software installation required.

Which video formats are supported?

Common video formats are supported for local transcoding, with customizable resolution, bitrate, and export presets.

Are videos uploaded to a server?

No. All video processing runs entirely in your browser, protecting your content's privacy.

How compatible is the MP4 output?

MP4 relies on the browser's WebCodecs support, so Chrome/Edge are recommended. If the browser cannot encode audio, a silent version is produced automatically; WebM is a safer default.

What bitrate should I use?

Lower bitrates reduce file size but lower quality. We recommend adjusting within the 1500–4000 Kbps range to balance the two; keep the page open while compression runs.

Technical References

  1. WebCodecs API — W3C / MDN: https://developer.mozilla.org/en-US/docs/Web/API/WebCodecs_API