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A cryptographic hash function takes any input -- a word, a file, an entire database -- and produces a fixed-length string of hexadecimal characters. The same input always yields the same output, but even a tiny change to the input produces a completely different hash. This one-way property makes hashes fundamental to modern computing: you can verify data without exposing the original content.
SHA stands for Secure Hash Algorithm, a family of functions published by NIST. SHA-1 produces a 160-bit (40 character) digest and is now considered weak for security purposes, though it remains useful for checksums and non-critical fingerprinting. SHA-256 and SHA-384 belong to the SHA-2 family and are widely used in TLS certificates, digital signatures, and blockchain systems. SHA-512, also part of SHA-2, outputs a 512-bit (128 character) digest and offers additional collision resistance for applications that demand it.
Developers use hashes to verify file integrity after downloads -- comparing a published SHA-256 checksum against a locally generated one confirms the file was not tampered with. Password storage systems hash credentials so that plaintext passwords are never kept on disc. Version control tools like Git use SHA-1 internally to identify commits and objects. API authentication schemes often rely on HMAC, which combines a secret key with a hash function to sign requests. Content delivery networks use hashes for cache busting, and forensic analysts use them to prove that digital evidence has not been altered.
This tool runs entirely in your browser using the Web Crypto API. No text is sent to any server. Your input stays on your machine.
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