Converting your own fonts (fonts you purchased or created) is legal. Converting fonts downloaded from "free font" websites (often pirated) is legally grey and morally dubious.
Run the conversion. For a "Tera" sized library (e.g., 5,000 fonts), this could take several hours. Once complete, run a validation report. Professional tools will flag corrupted or failed conversions so you don't deploy broken fonts to your team. Tera Font Converter
Open the "Expert" settings. Check "Hinting" (keeps fonts sharp on screens) and "Subsetting" (select only Latin or Latin + Cyrillic to reduce size by 90%). Converting your own fonts (fonts you purchased or