One-Way Fingerprints

This hash calculator computes MD5, SHA-1, SHA-256, and SHA-512 digests of any text entirely in your browser using the Noble Hashes library. A hash is deterministic — the same input always produces the same digest — yet practically irreversible, which makes hashes ideal for integrity checks and password verification.

Choosing an Algorithm

SHA-256 and SHA-512 remain secure for general use. MD5 and SHA-1 are broken: researchers have constructed collisions in seconds to minutes, so they are unsuitable where an attacker could craft two inputs with the same digest.

Privacy by Design

Because every digest is computed client-side, sensitive strings — API keys, tokens, candidate passwords — never transit the network. Use this tool to verify checksums, test hashing pipelines, or inspect how algorithms behave before integrating them.