Hash Generator

A hash generator that computes SHA-1, SHA-256 and SHA-512 cryptographic hashes for any text entirely in your browser using the Web Crypto API.

A cryptographic hash is a fixed-length fingerprint of data: feed in any text and you get a digest — 64 hex characters for SHA-256 — that changes completely if even one character of the input changes, and can't be reversed back into the original. That one-way fingerprint property powers file-integrity checks, cache keys, deduplication, content addressing in git, checksums on download pages, and (with proper salting and stretching) password storage.

This tool computes SHA-1, SHA-256 and SHA-512 using the Web Crypto API built into your browser — the same audited implementation your browser uses for TLS, not a JavaScript re-implementation. Tick the algorithms you want, paste the text, and copy each hex digest with one click. Everything stays on your device: pasting a config file or an API payload here doesn't send it anywhere, which is the whole point when you're comparing checksums of sensitive material.

Choosing an algorithm: SHA-256 is the modern default — fast, universally supported, no known practical attacks. SHA-512 offers a longer digest and is often faster on 64-bit hardware; use it when a system asks for it. SHA-1 is included because legacy systems still reference it (git object IDs, older checksums), but it's cryptographically broken for collision resistance — verify against it when you must, never design with it. MD5 is deliberately absent: it's been thoroughly broken for decades, and offering it invites misuse. And remember hashing alone is not how passwords should be stored — that job needs salts and a slow KDF like bcrypt or Argon2.