font-convert

A fast, pure-Rust font subsetter for web embedding.

Converts TTF/OTF/WOFF/WOFF2 → tiny WOFF2 (or WOFF/TTF) containing only the characters you need.

Perfect for static sites, build scripts, and reducing web font payload.

Features

• Pure(ish)-Rust (uses fontcull + Google's fast WOFF2 compression)
• Subsets based on text (Unicode, accents, emoji supported)
• Outputs ultra-small WOFF2 (e.g., 555 KB → 4 KB)
• CLI tool included
• No Python/fonttools required

Installation

cargo install font-convert

Usage

font-convert \
  --input NotoSans-Regular.ttf \
  --text "Hello World! café 🦀 All your site text here" \
  --output my-site.woff2

Result: my-site.woff2 (~tiny KB), ready for @font-face.

Example

@font-face {
  font-family: 'MySite';
  src: url('my-site.woff2') format('woff2');
  font-display: swap;
}
body { font-family: 'MySite', sans-serif; }