About DevTools Hub
A collection of developer tools that do their work in your browser tab, and nowhere else.
What this is
A set of 19 tools — formatters, encoders, hashers, converters and generators — grouped by category in the sidebar. No account, no upload step: open a tool, paste your input, read the output. Every page is a static file and every tool runs as JavaScript in your tab, so once a page has loaded it keeps working with the network disconnected.
Why it exists
Most online converters post your input to a backend and hand back a result from a server that has now seen it and, more often than not, logged it. For anything that came out of a production system, that is a data transfer to a third party. These tools avoid it by not having a backend at all: Base64 uses the browser's own btoa and atob, hashes and HMACs use the Web Crypto API, UUIDs and passwords come from crypto.getRandomValues. There is nowhere else for the input to go.
Who maintains it
An independently maintained project. Which tools get built next depends on what people actually ask for, so a concrete request — an example input and the output you expected — carries further than a name on a list. Suggest a tool.