Hash Generator

What a Cryptographic Hash Does

A hash function takes input of any size and produces a fixed-length fingerprint. For SHA-256 that fingerprint is 256 bits (64 hex characters); for SHA-512 it is 512 bits. Two critical properties make them useful: determinism (the same input always produces the same hash) and collision resistance (no feasible way to find two inputs with the same hash). This means a hash can uniquely identify a file, message, or block of data without revealing its contents — which is exactly why hashes sit at the core of file integrity verification, blockchain, code signing, password storage, content-addressable storage (Git, IPFS), and digital signatures.

Which Algorithm to Use

SHA-256 is the modern default for almost everything — TLS certificates, Git commits, Bitcoin, code signing, HMAC authentication. SHA-384 and SHA-512 are variants with larger output sizes; useful when you need extra margin against brute-force attacks or when the standard you are implementing mandates them (some compliance regimes do). SHA-1 is included here for legacy verification and Git compatibility, but it is cryptographically broken — collisions have been demonstrated — so never use it for signatures or integrity on new work. MD5 is not included because it is even more broken and there is no legitimate new use for it. For password hashing specifically, none of these are the right answer — use bcrypt, scrypt, or Argon2 instead, which are deliberately slow to resist brute force.

Everything Runs in Your Browser

This tool uses the Web Crypto API built into every modern browser, which means your input is hashed locally on your machine and never leaves it. No server-side processing, no logging, no risk of leaking sensitive strings you are hashing. For production systems that rely on hashes — file integrity verification, audit logs, content deduplication — I build hashing into data pipelines and storage layers correctly. Learn about custom application development, explore ETL services, or get in touch.