Is it safe to convert WebM to MP4 here?

Yes — your .webm file is converted entirely on your device. It is never uploaded anywhere.

Will the converted .mp4 file lose quality?

We use ffmpeg's standard settings for this pair, matching quality you'd get from a desktop tool.

Is there a file size limit?

Files up to 500MB are supported. No account required.

Convert WebM to MP4

Convert WebM video to MP4 for maximum device compatibility.

Drop a .webm file or click to browse

Max file size 500MB • No Account Required • Files Never Touch a Server

File signature verified before conversion — never uploaded

About converting WebM to MP4

WebM (.webm) files can be converted to MP4 entirely in your browser — no software to install, no file upload, and no account required. The conversion runs on a WebAssembly build of ffmpeg directly on your device.

FAQ

Is it safe to convert WebM to MP4 here?: Yes — your .webm file is converted entirely on your device. It is never uploaded anywhere.
Will the converted .mp4 file lose quality?: We use ffmpeg's standard settings for this pair, matching quality you'd get from a desktop tool.
Is there a file size limit?: Files up to 500MB are supported. No account required.

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