About Heron Tools

Heron Tools is a collection of free, browser-based utilities for the small calculations, conversions, and everyday tasks that come up in work and daily life — no sign-up and no installation required. It covers everyday favorites like a calculator and BMI checker, developer utilities such as a QR code generator, JSON formatter, and port number reference, unit converters, and lighthearted mini-games like Amidakuji and Omikuji fortune-telling — over 90 tools in total, all running entirely in your browser. Whatever you type is processed on the spot and never sent to an external server, so you can use every tool without worrying about privacy. Browse the sidebar, organized by category, to find the tool you need right away.