What Is SHA-256? How to Generate Hashes to Verify Data

SHA-256 is a hash function that turns any data into a 64-character hex string, used to verify the integrity of files and data.

SHA-256 Properties

• One-way: data becomes a hash, but you cannot reverse it back
• Avalanche effect: changing one character changes the whole hash
• Deterministic: same input always gives the same hash

Example

The text hello:

SHA-256 = 2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824

Hello (capital H) produces a completely different hash.

Where It Applies

• Verifying downloaded files (compare checksums)
• Digital signatures and certificates
• Blockchain and digital currency
• Storing passwords as hashes (never plaintext)

Try the SHA-256 generator to create hashes instantly.