When this tool is useful
WebM is useful for web playback and workflows that prefer open, royalty-free media codecs.
Video conversion
Convert MP4 video to WebM.
Create a royalty-free WebM output using browser-supported VP8 video and Opus audio encoders.
Live converter
MP4 to WebM
Processed on-device. Your video is not uploaded to ConvertZiva.
Drag & drop your file here, or choose a file. Desktop: 60 MB, 3 minutes, 1080p. Mobile: 25 MB, 1 minute, 720p.
Format notes and limits
The video is re-encoded to VP8 and audio to Opus. Quality and size may differ from the MP4 source.
Related tools and guidance
FAQ
About this tool
Will WebM be smaller?
Often, but not always. File size depends on source complexity, duration, resolution, and encoder behavior.
Which codecs are used?
The output uses VP8 video and Opus audio when supported by the browser.