Overview
Font Specimen provides a comprehensive environment for evaluating typefaces. Designers can load local font files, adjust variable font axes in real time, toggle OpenType features, and compare fonts side by side.
Key Features
- Drag-and-drop font file loading (OTF, TTF, WOFF2)
- Variable font axis sliders with real-time preview
- OpenType feature toggles (ligatures, stylistic sets, small caps)
- Side-by-side font comparison mode
- Paragraph settings: line height, letter spacing, word spacing
Technical Highlights
Font files are parsed client-side using opentype.js to extract axis definitions, feature tables, and glyph data. Variable font axes are dynamically mapped to range sliders based on the font's fvar table.
The preview renderer uses CSS font-variation-settings and font-feature-settings for real-time adjustments without re-parsing the font file. A waterfall view displays the font at standard sizes from 8px to 120px.
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