Resize WebM Videos Online, Free
Change WebM video resolution — the open web video format. 100% in your browser — no uploads required.
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How to Resize a WebM File
- Drop your WebM files — Drag and drop or select WebM videos from your device.
- Choose your target resolution — Select 1080p, 720p, 480p, or custom dimensions.
- Download instantly — Click “Resize” and download your resized WebM files.
Why Resize WebM Videos?
- Optimise for web delivery — WebM is designed for the web. Resizing to match display dimensions reduces bandwidth usage and improves streaming performance.
- Reduce file size — Downscaling from 1080p to 720p or 480p can cut file size by 50–75%.
- Prepare for HTML5 video — Serve correctly sized WebM files for
<video>elements without relying on the browser to downscale.
About the WebM Format
WebM is an open, royalty-free container format based on Matroska. It was created by Google specifically for web media.
- Video codecs: VP8, VP9, AV1
- Audio codecs: Vorbis, Opus
- Browser support: Chrome, Firefox, Edge, Opera
- Best for: Web video, HTML5 embedding
For maximum compatibility outside browsers, consider MP4 format.
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Frequently Asked Questions
- What is WebM?
- WebM is an open, royalty-free video format developed by Google. It typically uses VP8 or VP9 video codecs and Vorbis or Opus audio. It's designed for the web and is supported by all modern browsers.
- Is WebM better than MP4?
- WebM files are often slightly smaller than MP4 at similar quality, and the format is royalty-free. However, MP4 has broader compatibility outside of web browsers (e.g., on older devices and media players). For web use, both are excellent choices.
- Can I resize WebM without losing quality?
- When downscaling, some detail is lost due to fewer pixels, but the video looks sharp at the new resolution. Audio is preserved unchanged.
- Is it safe to resize WebM files online?
- With HelloResizer, your files never leave your device. All processing runs in your browser using FFmpeg WebAssembly.