MP4 to WebM

Turn MP4 into WebM with the output already selected for this page. Free batch processing with no signup or watermark.

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What changes when you convert MP4 to WebM?

MP4 and WebM are containers, while the video and audio codecs live inside them. Compatible streams may be copied; otherwise they are re-encoded for the selected WebM settings.

For the widest playback support, check that the selected video and audio codecs are accepted by the device or service that will receive the WebM file.

Add multiple videos and adjust the available video and audio codec settings before processing.

Open the finished WebM file and check fine details, layout and compatibility in the app where you plan to use it.

What is a MP4 file?

MP4 is a widely supported container for video and audio. Compatibility and file size depend on the codecs and settings used inside it, which is why MP4 with H.264 video and AAC audio is a common choice for sharing and uploading.

How to open a MP4 file

MP4 is widely supported by browsers, phones, smart TVs and desktop players. Playback still depends on the video and audio codecs stored inside the file.

What is a WebM file?

WebM is an open, royalty-free video format built for the web. It streams efficiently at small file sizes and is supported natively by modern browsers, which makes it ideal for online video and HTML5 players.

How to open a WebM file

WebM plays in all current browsers (Chrome, Firefox, Edge) and VLC; older devices or editing software may need it converted to MP4.

Frequently asked questions

Is it free to convert MP4 to WebM?

Yes. There is no sign-up, subscription or watermark on the converted file.

What happens to quality when MP4 becomes WebM?

MP4 and WebM are containers, while the video and audio codecs live inside them. Compatible streams may be copied; otherwise they are re-encoded for the selected WebM settings.

Which conversion options are available on this page?