Open-source licenses

LazyTools is built on excellent open-source software. This page lists the projects that power the site and its tools, with their licenses. It grows as new tools ship.

Site framework

• Astro — MIT License
• Preact — MIT License
• Tailwind CSS — MIT License

Tool engines

Unit conversion logic is implemented in-house using internationally published unit definitions (BIPM SI brochure; NIST Handbook 44; national standards for imperial/US customary units). Future tool categories will list their WebAssembly and JavaScript library attributions here (e.g. pdf-lib, ffmpeg.wasm and image codecs, with their respective MIT/LGPL licenses and source links).