PRIVATE WEBM COMPRESSOR

Compress WebM Video

Keep WebM output while reducing file size. VP9 video and Opus audio are encoded locally with no upload.

✓ No upload✓ No account required✓ Start immediately after selecting a video
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Drop your video hereMP4, MOV, WebM, WMV, and moreor● Nothing is uploaded
01

How to use this preset

  1. Choose a WebM file.
  2. Use compact quality or enter a target size.
  3. Export a smaller VP9/Opus WebM and verify it in the destination browser.
02

When to use this preset

  • Optimizing a WebM asset for a webpage.
  • Reducing a browser recording while retaining WebM.
  • Making a smaller local sharing copy.
03

Check before you share

VP9 software encoding can be CPU-intensive. Keep the tab in the foreground and use shorter sections on memory-limited mobile devices.

Your source video stays on this device.
Creator toolsEverything stays local
⇣Compress videoOpen dedicated tool→25Compress to 25MBOpen dedicated tool→◉Edit your YouTube videoOpen dedicated tool→▥Resize for ShortsOpen dedicated tool→
01Truly local processingFile APIs, WebCodecs, and WebAssembly all run in your browser.
02Every feature is freeNo file-size limit, with up to 4K, batch, and advanced tools.
03No server copyNo video upload endpoint and no account required.