MP4 → WEBM
MP4 to WebM
Convert a supported MP4 video into VP9/Vorbis WebM.
Temporary cloud processing. Enable JavaScript to select and convert a file.
About this conversion
What happens
After consent, the source uploads to temporary storage, runs in the offline FFmpeg sandbox, and a separate validator gates download.
Limits
250 MiB input. 15 minutes, up to 3840×2160, and 500 MiB output.
Things to know
Keep the source resolution or cap it at 1080p/720p. Balanced quality is the default for compatibility and size. Unsupported MOV/MP4 brands, codecs, pixel formats, missing requested audio, extra streams, limits, or invalid EBML output fail closed.