WebM compression

Compress WebM files online

Screen recorders and browsers often export WebM. BotMart compresses to a smaller MP4 for sharing on YouTube, Discord, and email.

Upload WebM directly—no local FFmpeg install.
Output is MP4 (H.264 + AAC) for broad compatibility.
Only need format change, not smaller size? Try convert to MP4.
Uploads and outputs removed automatically within 24 hours.

Start compressing Compress WebM

Also see convert to MP4, MP4 converter and video compression.