The licensing angle other converters skip
Web-font generators traditionally work by upload: your font file — a licensed good — gets copied to someone's server to be repackaged. Converters here run the encoders in your browser instead (Google's woff2 compiled to WebAssembly, and a spec-exact WOFF writer), so the file never leaves your machine. That doesn't grant web-embedding rights your license lacks — check your EULA — but it does mean the conversion itself creates no third-party copy. Each output is also test-loaded with the FontFace API before you download it, so "converted" means "verified to load in a real browser", not "probably fine".
| WOFF2 | WOFF | |
|---|---|---|
| Size vs TTF | ~40–50% | ~60–70% |
| Browser floor | 2016+ (all modern) | IE9 (2011) |
| Use today | The default choice | Legacy fleets only |