About ZoolTools

ZoolTools is a growing collection of 114+ free online tools and calculators — everything from image and PDF utilities to text and developer tools, unit and currency converters, and finance, tax and health calculators — all in one fast, no-nonsense place.

Privacy by design

File tools such as image compression, PDF editing and format conversion run entirely in your browser. Your files never leave your device and nothing is uploaded to a server. That means instant results, no upload waits, and no privacy trade-offs.

Free and open to everyone

There’s no sign-up, no paywall and no clutter. Open any tool and start using it right away on desktop or mobile. ZoolTools is supported by unobtrusive advertising so the tools can stay free for everyone.

Accurate and consistent

Every calculator uses standard, documented formulas that are validated against a shared set of test cases, so results are consistent across our website and mobile app. Finance and tax figures are estimates for the period cited — see our Disclaimer.

Get in touch

Have feedback or a tool request? Visit our Contact page, or browse all tools to get started.