Convert MP4 Video to WebM on Your Device

Convert MP4 to WebM in your browser for web publishing and Chromium-based playback. The original source video stays on your device.

Drop files here or browse (MAX 500 MB)

Max 500 MB per file

Preview (optional)

When your browser supports it, your video appears here. If preview does not load, you can still convert your file normally.

Ready

File name

Your device handles the conversion locally instead of sending the video to a server.
Long or high-resolution MP4 files require more processing time and memory.
Keeping the conversion tab active can help a large job finish reliably.

WebM is intended here for web publishing and Chromium-based playback.
WebM is designed for web delivery, but some Apple and legacy apps need another format.
Confirm the receiving system accepts WebM with the encoded video and audio settings.

Conversion running slowly? Close demanding apps or test with a shorter clip.
WebM file will not open? Use a WebM-compatible player and check its codec support.
Delivery failed? Match the codec, resolution, frame rate, and audio settings to the WebM specification.

Why convert MP4 to WebM?

Use WebM when a player, editor, archive, or delivery system requires it instead of MP4.

Does my MP4 video get uploaded?

No. Conversion runs on your device, so the source video is not sent to a processing server.

How should I check the WebM result?

Open the download in its intended player or editor, then verify picture, sound, duration, and synchronization.

Quick use cases