About ToolNest

ToolNest is a collection of 121 small tools for problems you run into once — splitting a bill, converting units, generating a password, formatting JSON. Each tool does one job, gives you an answer instantly, and gets out of the way.

Fast and private by design

Every calculation runs locally in your browser. Your numbers, passwords and text never leave your device, and pages are plain HTML with almost no JavaScript, so they load in well under a second even on slow connections.

Free forever

No accounts, no paywalls, no “premium” tiers. The site is supported entirely by the ads you see in clearly marked slots — and it is usable with and without them.

Request a tool

Missing something you use once a year? Suggest it and it can show up here — the whole site is built from a single, easy-to-extend catalog of tools.