How to compress WebM
- 1
Add your WebM files
Drag and drop WebM files onto the compressor, paste them, or click to browse. You can add several at once.
- 2
Pick a level or a target
Balanced is selected and suits most files. Choose Light to stay closer to the original or Strong for the smallest file, or set a target size or a percentage to reduce by.
- 3
Compress
Click Compress. Your WebM files are processed right in your browser, usually in seconds.
- 4
Download
Download each smaller WebM, or everything at once as a ZIP.
What compression does to WebM
Re-encodes VP9/Opus at a lower bitrate (and resolution on Strong).
- Light
- Near-lossless: re-encodes conservatively and keeps the full resolution.
- BalancedDefault
- The default: looks the same for most uses, and typically 40–70% smaller.
- Strong
- Smallest file: lower quality, and large videos are downscaled.
Need an exact size?
Set a target size in the compressor above, or a percentage to reduce by, and each WebM is compressed to land at or just under it. These pages preset the most common video sizes and take WebM too:
WebM · WebM Video
WebM is an open, royalty-free video format designed for the web, using VP8/VP9 or AV1 video with Opus audio.
- Type
- Video
- Extension
- .webm
- MIME
- video/webm
- Best for
- video on websites and in browsers
Compressing WebM: frequently asked questions
Smaller WebM files, in seconds.
No sign-up, no watermark, no upload. Drop a file and get it back lighter.
- Most conversions never leave your device
- Cloud files deleted automatically
- No watermarks