Choose a font or drop it anywhere on this page. The file stays in this browser.
Drop the font to open it .otf, .ttf, .woff, .woff2
Substitution matrix
Open a font to see every locl substitution at once.
Glyphs are drawn from the font's GSUB data, independent of browser shaping. Tap a character to add it to the proof text. ctx marks glyphs substituted only in context (ligature or contextual rules).
Text proof
Previews rely on the browser's language-based shaping; Chrome and Safari ignore font-language-override, so cross-check against the matrix above.