KeyForge

KeyForge is a free developer utility for the small, repetitive tasks that come up constantly while building software: generating a UUID, hashing a string, encoding to Base64, or running quick AES-256 encryption.

Everything runs entirely client-side in your browser — nothing you paste in is sent to a server, which matters when you're working with anything sensitive.

It's built to be the tab you keep open while coding rather than a tool you have to remember how to use — no accounts, no rate limits, and no setup. Paste in a value, get the result, and move on with whatever you were actually working on.

Like RunYourNumbers, KeyForge is funded by advertising rather than a subscription, which is what keeps it free for casual and frequent use alike. Because the tools run client-side, the same privacy guarantee applies regardless of how often you use it.

It's aimed at developers who just need a quick answer — pasting a UUID into a ticket, double-checking a hash, or decoding a Base64 string someone sent over chat — rather than anyone needing a full cryptography library or SDK.