Use online converters like FontForge or Transfonter to convert the .ttf file to .woff2 for faster website loading.

: You can download free Unicode Tamil fonts developed by Ila Sundaram. This package includes a variety of styles in a single zip file.

Because APT Sangam is not a standard Unicode font, simply selecting it in MS Word and typing on an English keyboard will result in garbled text or English letters. You need a keyboard manager:

Apt Sangam is a collection of Tamil fonts designed for clear, readable Tamil text across print and digital media. These fonts typically include multiple weights and OpenType features (ligatures, conjuncts) to support proper Tamil script rendering and layout.