LOCAL MP4 TO WEBM CONVERTER

Convert MP4 to WebM

Export a browser-friendly WebM file using VP9 video and Opus audio. Trimming, crop, text, captions and audio settings remain available.

✓ 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 an MP4 file.
  2. Adjust trim, quality, dimensions or overlays if needed.
  3. Export a VP9/Opus WebM file on this device.
02

When to use this preset

  • Preparing an efficient video asset for a website.
  • Creating a WebM alternative to an MP4 master.
  • Converting private footage without a cloud upload.
03

Check before you share

WebM encoding uses FFmpeg.wasm and can take longer than hardware-assisted MP4 export, especially on 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.