Utilities & Tools

A growing collection of fast, browser-only tools for programming, time, astronomy, and unit conversion.

Character codes, base conversion, regex testing, JSON formatting, hashes, Base64, URL encoding, timestamps.

World clock, timezone conversion, date difference, and Julian day calculations.

Sunrise/sunset times, moon phases, and planetary hours for any location.

Length, mass, volume, area, time, speed, temperature, and data size — all bidirectional.