100% Client-Side

SHA-256 Hash Generator

Generate SHA-256 cryptographic hashes instantly — Hex or Base64 output

Free Client-Side No Login No Storage
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How to Use the SHA-256 Hash Generator

  1. Paste or type any text into the input field.
  2. The SHA-256 hash is generated instantly as you type.
  3. Choose Hex (default) or Base64 output format.
  4. Click Copy to copy the hash to your clipboard.

What is SHA-256?

SHA-256 (Secure Hash Algorithm 256-bit) is a cryptographic hash function that converts any input into a fixed 64-character hexadecimal string. It is part of the SHA-2 family, designed by the NSA and published by NIST in 2001.

Common uses

  • File integrity verification — compare hashes before and after download
  • Password storage — store hashes instead of plaintext passwords (use bcrypt for passwords in production)
  • Digital signatures — used in SSL/TLS certificates and code signing
  • Blockchain — Bitcoin uses SHA-256 for block hashing

Security note: SHA-256 is a one-way function — you cannot reverse a hash to get the original input. It is collision-resistant, meaning two different inputs are extremely unlikely to produce the same hash.

What is SHA-256 Hashing?

SHA-256 (Secure Hash Algorithm 256-bit) is a cryptographic hash function that converts any input into a fixed 64-character hexadecimal string. It is part of the SHA-2 family, designed by the NSA and published by NIST in 2001. SHA-256 is used in TLS/SSL certificates, blockchain, digital signatures, and file integrity verification.

Common Uses

  • File integrity verification — compare hashes before and after download
  • Digital signatures in SSL/TLS certificates and code signing
  • Blockchain — Bitcoin uses SHA-256 for block hashing and proof-of-work
  • Password storage (though bcrypt or Argon2 are preferred for passwords)

Frequently Asked Questions

Can SHA-256 be reversed or decrypted?

No. SHA-256 is a one-way function — you cannot reverse a hash to get the original input. The only way to find an input that produces a given hash is brute-force, which is computationally infeasible for SHA-256.

Is SHA-256 still secure?

Yes. As of 2026, SHA-256 has no known practical attacks. It remains the standard for cryptographic hashing and is used by Bitcoin, TLS 1.3, and virtually all modern security systems.

What is the difference between SHA-256 and SHA-512?

SHA-256 produces a 256-bit (64 hex character) hash, while SHA-512 produces a 512-bit (128 hex character) hash. SHA-512 is slightly faster on 64-bit systems but both are equally secure for practical purposes.

Notes from this implementation

What you get from this file

The button runs SHA-256 over the exact bytes of the text field, UTF-8, with no secret and no salt. The hex digest is 64 characters. The same input always produces the same digest, which is the point of a checksum and the reason it is a poor password store.

Vector

hello
2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824

A trailing newline changes the digest. If a release page shows a hash for file.zip and you hash the URL or the filename instead of the file bytes, the comparison is meaningless. This page hashes the text you paste, not a file on disk. For a file, use the checksum tool, which reads the file’s bytes.

What SHA-256 does not decide

A matching digest tells you the bytes did not change. It does not tell you who created them. Pair it with a signature (RSA or ECDSA) when the question is authorship. Bitcoin’s proof-of-work uses double SHA-256 on block headers; pasting a headline into this box is not mining and not a wallet operation.