To ensure you are getting the "high quality" files (usually in OTF or TTF format) and staying legal, consider these sources:
PSL Kittithada Light 45 is a premium Thai typeface known for its balanced, modern, and elegant sans-serif design. While many users search for a "free download," Kittithada is a commercial font family protected by copyright, and high-quality, legal copies generally require a purchase from the official foundry or authorized retailers. Font Profile & Design Phanlop Thongsuk. PSL SmartLetter (PSL Display). kittithada light 45 font free download high quality