SHA-256 & SHA-512 Hash Generator

Crypto · SHA-256 · SHA-512

Generate SHA-256 and SHA-512 digests from text using the Web Crypto API — entirely in your browser. Useful for integrity checks, demos, and content fingerprints, with clear guidance on what hashing is not for.

SHA-256 & SHA-512 Web Crypto API Client-side digests Copy hex output No server round-trip

What a cryptographic hash is

A cryptographic hash function maps arbitrary input to a fixed-size digest. Small changes in the input produce completely different outputs (avalanche effect). Good hash functions are designed to be one-way: you should not recover the original message from the digest alone.

SHA-256 (32-byte digest) and SHA-512 (64-byte digest) are widely deployed in TLS, software signing pipelines, Git (content addressing relatives), and checksum files. This tool exposes both via crypto.subtle.digest in supporting browsers.

Passwords: Do not store passwords as raw SHA-256(password). Use a password hashing KDF — Argon2, bcrypt, or scrypt — with a unique salt, on the server. Fast hashes are the wrong tool for password storage.

How to use it

Enter or paste the text to hash.
Generate digests — SHA-256 and SHA-512 appear in the output panels.
Copy a hex digest and compare it to a published checksum or another system’s output.
Remember encoding: hashing the string abc as UTF-8 is standard here; hashing binary file bytes may differ if tools assume another encoding.

When hashing helps

Integrity checks — confirm a string or downloaded artifact matches a known digest (for files, prefer CLI tools that hash bytes on disk).
Cache keys / content fingerprints — stable digests of canonical payloads (watch normalization: whitespace changes the hash).
Teaching — show students that changing one character rewrites the entire digest.
Quick comparison — verify two environments produce the same payload without sharing the full secret body (still be careful what you hash and where).

Hash vs encryption vs encoding

Operation	Reversible?	Purpose
Hash (SHA-256)	No (by design)	Integrity, fingerprints
Encryption (AES, …)	Yes with key	Confidentiality
Encoding (Base64)	Yes, no secret	Safe transport of bytes as text

Example

Input:  hello
SHA-256: 2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824

(Verify with another trusted implementation if you use digests in a security decision — and always hash the exact same bytes.)

FAQ

Is hashing the same as encryption?

No. Hashes are one-way digests. Encryption is designed to be reversed with the correct key.

Why doesn’t my hash match another website?

Different algorithms, hex vs base64 output, added newlines, or UTF-8 vs UTF-16 encoding. Compare algorithm and exact input bytes.

Does text leave my browser?

Hashing uses Web Crypto locally. Privacy Policy.

MD5 / SHA-1?

This tool focuses on SHA-256/512. MD5 and SHA-1 are deprecated for security-sensitive integrity in most modern threat models.

Related tools

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