Crypto
The Crypto & Hash category brings together tools for common security-related tasks — from generating passwords to computing hash values and verifying them with bcrypt — all running entirely in your browser. Nothing you type or upload is sent to an external server; every operation happens client-side, so it's safe to use even with passwords or other sensitive information.
A hash function is a one-way transformation that always produces the same output (hash value) for the same input, which makes it useful for detecting file tampering and storing passwords securely. MD5 and SHA-1 are no longer recommended for new security applications because of known vulnerabilities, but they're still widely used for backward-compatible purposes such as checksum verification.
We also offer classical cipher tools that recreate the Caesar cipher, the Vigenère cipher, and the Enigma machine used by the German military in World War II. They're not suitable for modern security purposes, but they're a fun way to learn the history and mechanics of cryptography.