MP4 → WebM.
Built for the web.

Convert MP4 to modern WebM with control over codec, quality, size, frame rate and audio. No signup, no watermark, and your source video stays on your device.

MP4 to WebM

Local browser preview · production uses self-hosted FFmpeg/WASM

Your MP4 stays on this deviceThe test converter runs in your browser. Nothing is uploaded by this preview.

MP4

Drop your MP4 here

Choose an MP4 and OneFreePlace will inspect the video locally before you decide how to encode the WebM.

Best with current Chrome / Edge for this standalone test preview

SOURCE · MP4

video.mp4—

Source size—

Resolution—

Duration—

Output estimate—

Optional trimFull video

StartEnd

Your WebM is ready—

Download WebM

MP4 source—

→

WebM output—

Ready-to-use HTML

<video controls src="video.webm"></video>

Web-ready choicesVP9 for modern delivery, VP8 for broad legacy WebM support, with explicit resolution, frame-rate and audio controls.

Private by defaultThe source stays local in this browser preview. Production is designed around the same browser-first principle.

Useful after conversionPreview the output, compare its size with the MP4, download it, then copy an HTML video tag for immediate use.

MP4 → WebM.Built for the web.

Drop your MP4 here

MP4 → WebM.
Built for the web.