Hash Generator — Create SHA-256 and SHA-512 Hashes Online
A cryptographic hash function takes any input — a word, a sentence, or an entire document — and produces a fixed-length string of characters that acts as a digital fingerprint of that data. Change even a single character of the input and the resulting hash changes completely and unpredictably. Hashes are one-way: it is computationally infeasible to reverse a hash back into the original text, which is what makes them useful for verifying data without exposing it.
This tool generates hashes using the four SHA algorithms provided by the browser's built-in Web Crypto API: SHA-256, SHA-1, SHA-384, and SHA-512. SHA-256 is the most widely used today — it underpins TLS certificates, Bitcoin, Git object storage, and countless file-integrity checks. SHA-512 produces a longer digest for applications that want a larger security margin. SHA-1 is included for compatibility with older systems, though it is no longer considered secure against deliberate collision attacks and should not be used for new security-critical work.
Because it uses the native Web Crypto API, hashing happens entirely on your device. Your text is never transmitted to a server, logged, or stored anywhere — making this safe to use even with sensitive input. The hash updates instantly as you type, and you can copy the result with a single click.
Common uses include verifying that a downloaded file matches its published checksum, generating a fingerprint of a piece of text to detect later changes, creating lookup keys or cache keys from content, checking the integrity of copied data, and learning how different algorithms produce different-length outputs from the same input. Note that a plain hash alone is not a secure way to store passwords — real password storage requires a slow, salted algorithm such as bcrypt, scrypt, or Argon2 — but for integrity checks and fingerprinting, these SHA hashes are exactly the right tool.
How to use the Hash Generator
- Type or paste the text you want to hash into the input box.
- Choose an algorithm: SHA-256, SHA-1, SHA-384, or SHA-512.
- The hexadecimal hash appears instantly below and updates as you edit.
- Click Copy to put the hash on your clipboard.
- Switch algorithms to compare how the same text produces different digests.