What Is SHA-256 and How Does Hashing Work?
SHA-256 is the workhorse hash behind file checks and many security tools. This guide explains fixed-length output, one-way hashing and verification.
What is the SHA-256 Hash Generator?
SHA-256 turns any text into a fixed 64-character hexadecimal fingerprint: the same input always gives the same hash, while even a tiny change gives a completely different one. This tool computes the hash with the browser's WebCrypto API, so the text never leaves your device. A hash is one-way, so it cannot be reversed back into the original text.
How to use it
- Type or paste the text to hash.
- Click Generate hash.
- Copy the 64-character hexadecimal result.
Worked example
Hashing the sample text hello gives SHA-256: 2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824.
How long is a SHA-256 hash?
Always 256 bits, shown as 64 hexadecimal characters, no matter whether the input is one letter or a whole book.
Frequently asked questions
Can I get my original text back from a hash?
No. SHA-256 is one-way by design; the only way to check a text is to hash it again and compare the two hashes.
Does changing one letter change the hash a lot?
Yes. That avalanche effect is deliberate: even a single-character change produces a hash that looks unrelated to the original.