About OnlineMultiTool

Free tools for everyone, no strings attached.

OnlineMultiTool is a growing collection of free, browser-based utilities covering a wide range of topics — from astronomy and science to everyday calculations. Every tool runs entirely in your browser: no server processing, no account creation, no paywalls.

Why we built it

The web is cluttered with tool sites that bury simple functionality behind ads, popups, and mandatory sign-ups. We wanted a clean alternative: one URL per tool, a straightforward interface, and no friction between you and the answer you're looking for.

Our principles

All tools are free to use. We do not require registration or login. We do not sell your data. Where possible, computation happens entirely on the client side so your input never leaves your device.

Contact

Have a suggestion for a new tool, found a bug, or just want to say hello? Reach out at [email protected] — we read every message.