All Tools

This is the complete index — every tool on the site, grouped the way the categories are organised. If you already know roughly what you want, the search box on the homepage will get you there faster than scrolling; this page is for when you would rather see the whole shape of what is available.

A few things worth knowing before you pick one. Almost everything here runs inside your own browser, so the file you drop in is not uploaded anywhere and there is no size limit imposed by a server. The exceptions are the network tools, the currency converter, and speech recognition, all of which have to ask an outside service — the methodology page names all thirteen and what each one sends. Nothing needs an account, and no tool holds part of its output back behind a payment.

The calculators are the biggest group by a wide margin, which is why they are split into finance, health and fitness, maths, science and everything else. Each calculator page states the formula it uses, so you can check the result rather than assume it. If one of them gives you an answer you think is wrong, that is worth an email — the contact form goes straight to the person who wrote it.