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Video Converter

Converting between MP4 and WebM runs locally in your browser via ffmpeg.wasm — nothing gets uploaded. The first time you use it, the conversion engine (~30 MB) downloads once; later conversions will be faster.
Click or drag & drop a video (MP4, WebM, MOV, and more)

More about this tool

Converts video between popular formats (MP4, WebM, MOV, AVI, and more) right in your browser, without uploading the video to a third-party service.

For example: You shot a video on your phone in a format an upload platform won't accept — convert it to MP4 right here before publishing.

Who uses it most: Video editors, bloggers, social media specialists, online course instructors

Frequently asked questions

Does converting video take long?

It depends on the file size and your device's power — conversion runs locally via WebAssembly (ffmpeg.wasm), so large videos can take a few minutes.

Is there a limit on video size?

The limit comes from your browser and device's memory, not a server — very large files (several gigabytes) may run slowly or hit memory limits.

Does the video get uploaded anywhere for processing?

No — the entire conversion happens locally in your browser; the file is never sent anywhere.