Hash Identifier

Hash Identifier is a free, instant, browser-based tool that identify the type of a given hash string. Cryptographic hash functions take an input of any size and produce a fixed-length output (the hash or digest) that is unique to that input. Even a tiny change to the input — a single character — produces a completely different hash. This property makes hashing essential for data integrity verification, password storage, digital signatures, and checksums.

This tool computes hashes entirely in your browser using the Web Crypto API and other standard browser APIs. Your data never leaves your computer.

Common use cases include verifying the integrity of downloaded files by comparing their SHA-256 hash against a published checksum, securely storing passwords by hashing them before writing to a database, generating HMAC signatures for API authentication, creating unique identifiers from content (content-addressable storage), and detecting duplicate files or database records.

Note that MD5 and SHA-1 are considered cryptographically broken and should not be used for security-sensitive applications. For password hashing, use bcrypt, scrypt, or Argon2 rather than raw SHA hashes, as these are specifically designed to be slow and resistant to brute-force attacks. For general-purpose integrity checking, SHA-256 or SHA-3 are the current standards.