SHA-256 Hash Generator

Generate SHA-256 hash values for text strings instantly in your browser. Part of the SHA-2 family, SHA-256 produces a 256-bit (64 character) hash.

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About SHA-256

SHA-256 is a cryptographic hash function that produces a 256-bit (32-byte) hash value. It is part of the SHA-2 family and is widely used for data integrity verification, digital signatures, and blockchain applications. All processing happens locally in your browser — no data is sent to any server.

Frequently Asked Questions

What is SHA-256?

SHA-256 (Secure Hash Algorithm 256-bit) is a cryptographic hash function that produces a 256-bit (32-byte) hash value, typically represented as a 64-character hexadecimal string. It is part of the SHA-2 family designed by the NSA and published by NIST.

Is SHA-256 secure?

Yes, SHA-256 is currently considered cryptographically secure and is widely used in SSL/TLS certificates, blockchain technology (Bitcoin), digital signatures, and password hashing. No practical collision attacks have been demonstrated against SHA-256 as of 2024.

What is the difference between SHA-256 and MD5?

SHA-256 produces a 256-bit (64 character) hash versus MD5's 128-bit (32 character) hash. SHA-256 is cryptographically stronger and is the recommended replacement for MD5. SHA-256 is also more resistant to collision attacks.

How long is a SHA-256 hash?

A SHA-256 hash is always 64 hexadecimal characters long, representing 256 bits (4 bits per character × 64 characters = 256 bits). The hash is the same length regardless of input size, from a single character to an entire file.

Can SHA-256 be reversed?

No, SHA-256 is a one-way function. You cannot reverse the hash to get the original input. This is why it's used for password storage—even if the hash database is compromised, the original passwords cannot be recovered.

How is SHA-256 used in blockchain?

SHA-256 is the core hash function used in Bitcoin and other cryptocurrencies. It's used for mining (proof-of-work), creating transaction IDs, generating wallet addresses, and linking blocks together. The '256' in SHA-256 refers to the 256-bit output.