What are hashes for?
A cryptographic hash turns any input into a fixed-length fingerprint. The same input always produces the same hash, but you can't reverse it back to the original. Developers use hashes to verify file integrity, store password checksums, and detect changes in data.
Which one to use?
SHA-256 is the modern standard — secure and widely supported. SHA-512 is even stronger. SHA-1 is included for legacy compatibility but is no longer considered secure for new systems. All hashing happens locally via your browser's built-in Web Crypto API — your text is never sent anywhere.