List every GSUB/GPOS feature tag (liga, calt, smcp, ss01, swsh, kern) with human-readable labels and the font-feature-settings CSS to enable each one.
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We walk the GSUB and GPOS feature lists across all scripts and languages
Get a JSON list of unique tags with descriptions and ready-to-paste CSS for each
0 bytes uploaded. OpenType Feature Tag Inspector runs entirely in your browser using opentype.js and the File API. Your fonts never leave your device.
This tool requires the Free plan or higher.
Latin fonts: kern, liga, calt, frac, ordn, sups, subs. Display fonts add: smcp (small caps), ss01–ss20 (stylistic sets), swsh (swashes), salt (stylistic alternates), titl (titling alternates).
Tags can be defined per script/language pair. Arabic ligatures activate only when the script is set to arab; Cyrillic fonts may have specialised localised forms via the locl tag.
font-feature-settings: "smcp" 1; or use the high-level alias font-variant-caps: small-caps;. The output of this tool includes both forms for every tag detected.
Preview ligature on/off rendering for any font, then export the CSS to control ligatures via font-feature-settings without modifying the binary file.
Open toolInspect every kerning pair in the kern and GPOS tables. See which letter pairs adjust and by how many font units. Catch missing pairs and unintended kerning.
Open toolBuild a complete @font-face declaration with WOFF2/WOFF/TTF fallbacks, font-display, unicode-range, and proper format() hints. Copy-paste ready.
Open tool