About ConvertBase.app

ConvertBase.app is a free collection of online tools - converters, calculators, generators, and developer utilities - built around a simple idea: the answer to an everyday question should be one click away.

The project was started in 2025 by Paweł Celiński, a Power Platform developer at Toyota Material Handling Poland. Working daily with business automation tools, Paweł kept running into the same friction: simple conversions and calculations that required either memorising formulas or juggling multiple browser tabs. ConvertBase.app is the solution he built for himself - and made available to everyone.

Every tool on this site runs entirely in your browser. No installation, no account, no fees. Your data never leaves your device.