static-to-variable

Build a variable font from a set of static font files with the static-to-variable CLI. Covers reading each weight, authoring stv.config.json, running the build, handling glyphs that don't interpolate, and previewing the result. Use when the user wants to "make a variable font from static weights", "combine these OTFs into a variable font", "add a weight axis", "convert static fonts to variable", "use static-to-variable", or "build a wght axis from Thin/Regular/Bold files".