SHA256 Generator
Generate SHA256 hash
Frequently Asked Questions
What is SHA-256?
SHA-256 is part of the SHA-2 family, producing a 256-bit (64-character hexadecimal) hash. It is the current standard for data integrity, digital signatures, and blockchain (Bitcoin uses SHA-256). No practical collision attacks exist.
How secure is SHA-256?
SHA-256 has 2^256 possible outputs — more than the number of atoms in the observable universe. Finding a collision would require approximately 2^128 operations, which is computationally infeasible with current and foreseeable technology.
Can I use SHA-256 for password hashing?
Plain SHA-256 is too fast for passwords (billions of hashes per second enable brute force). Use bcrypt, Argon2, or PBKDF2 which are intentionally slow. SHA-256 is excellent for data integrity, digital signatures, and blockchain.
How do I verify a file download with SHA-256?
Upload the downloaded file to generate its SHA-256 hash. Compare it character-by-character with the hash provided by the source. If they match, the file is authentic and uncorrupted. Even a 1-bit change produces a completely different hash.
What is the difference between SHA-256 and SHA-3?
SHA-256 (SHA-2 family) uses a Merkle-Damgård construction. SHA-3 uses a completely different sponge construction (Keccak). Both are secure, but SHA-3 provides a backup if SHA-2 is ever compromised. SHA-256 is more widely deployed.