Input
recording.mp4
Output
recording-compressed.webm
Audio & Video Tools
Batch Video Compressor to WebM
Compress multiple videos locally and output WebM VP9/Opus. Choose resolution and quality while the heavy media engine loads only when processing begins.
Video compressionWebMVP9
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Quick actions
Copy this tool URL or open the system share sheet on a supported device.
Media tool
Video Compressor
Compress multiple videos in your browser and export WebM with VP9 video and Opus audio. Files are never uploaded.
0–100%
The media engine is several dozen MB and loads from this site only after you start. Heavy jobs always run one at a time.
Desktop: up to 5 files, 150 MB each. Limited devices: 2 files, 30 MB each.
Use cases
- Reduce video size for the web
- Compress screen recordings before sharing
- Batch-convert videos to open WebM
How to use
- Add video files
- Choose resolution and quality
- Compress and download WebM files or a ZIP
Example input and output
FAQ
Why does v1 not output H.264 MP4?
v1 uses VP9 and Opus to keep a self-hostable licensing boundary and control the WebAssembly size.
Does it work on phones?
Yes, with lower file-count and size limits. Long videos are better handled on desktop.
Tools
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Record a screen, window, or browser tab with native screen sharing and MediaRecorder. Add microphone or available system audio and download without uploading the recording.
Screen recording Recorder WebM