Workflow

Move a Google Font from the hosted API to your own server: download the files, convert them to WOFF2, write the @font-face rules, and remove the old links.

Serve your own font files: get a WOFF2, write one @font-face rule per style, set caching and CORS headers, and check that the right file loads.

A pre-launch checklist for font files: format and size, name and weight, version, the characters your content needs, and the license notes inside the file.