Why You Need This
WebM is the preferred video format for the web. It uses the VP9 codec which delivers excellent quality at significantly smaller file sizes compared to older codecs like H.264. Major browsers including Chrome, Firefox, and Edge all support WebM natively.
Web developers embedding video in HTML5 pages benefit from WebM because it reduces bandwidth costs and improves page load times. The format is also royalty-free, which avoids potential licensing issues that come with some other codecs.
FastCut Pro can convert your MP4, MKV, MOV, or other video files to WebM directly in the browser. The VP9 encoding is handled by WebAssembly, so you do not need to install any software or upload your file to a conversion service.
Step-by-Step Guide
- Step 1: Open fastcut.cc and load the video file you want to convert.
- Step 2: Go to the export settings and select WebM as the output format.
- Step 3: Choose the video codec. VP9 offers the best compression while VP8 provides faster encoding at a slight quality trade-off.
- Step 4: Set the target bitrate or quality level. For web use, a CRF value of 30 to 35 provides good quality at a reasonable file size.
- Step 5: Select Opus as the audio codec for the best audio quality and compression in the WebM container.
- Step 6: Click Export. The encoding will take some time depending on your video length and computer speed. The finished WebM file downloads automatically.
Why Use FastCut Pro
- No Upload Required — VP9 encoding happens locally in your browser using WebAssembly. Your source file stays on your machine.
- Lossless Quality — You control the quality settings precisely. Use a lower CRF for near-lossless output when needed.
- 100% Free — Full VP9 encoding with no file size limits, no watermarks, and no conversion caps.
- Privacy First — No file data is transmitted to any external server during the conversion process.
Pro Tips
- Use two-pass encoding for the best quality-to-size ratio when file size is a priority, such as for website background videos.
- For animated backgrounds on landing pages, consider reducing the resolution to 720p and the frame rate to 24fps to minimize bandwidth usage.
- Test your WebM files in multiple browsers before deploying to ensure compatibility. Safari added WebM support but older versions may still have issues.