WebM → MP4.
Play it anywhere.

Turn WebM into a broadly playable MP4 with control over compatibility, quality, size, frame rate and audio. No signup, no watermark, and your source video stays on your device.

WebM to MP4

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

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

WebM

Drop your WebM here

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

Best with current Chrome / Edge for this standalone test preview

SOURCE · WEBM

video.mp4—

Source size—

Resolution—

Duration—

Output estimate—

Optional trimFull video

StartEnd

Your MP4 is ready—

Download MP4

WebM source—

→

MP4 output—

Ready-to-use HTML

<video controls src="video.mp4"></video>

Compatibility-first choicesChoose a compatibility target, resolution, frame rate and audio quality before creating the MP4.

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

Useful after conversionPreview the MP4, compare its size with the WebM, download it, then copy a ready-to-use HTML video tag.

WebM → MP4.Play it anywhere.

Drop your WebM here

WebM → MP4.
Play it anywhere.