SHA-256 vs SHA-512: Which Hash Algorithm to Use

SHA-256 and SHA-512 are both members of the SHA-2 family of cryptographic hash functions. They take arbitrary input and produce a fixed-size hash digest. The main difference is output length: SHA-256 produces 256 bits (64 hex characters), SHA-512 produces 512 bits (128 hex characters).

Quick Comparison

Feature	SHA-256	SHA-512
Output size	256 bits (32 bytes)	512 bits (64 bytes)
Hex length	64 characters	128 characters
Block size	512 bits	1024 bits
Speed (64-bit CPU)	Slower	Faster (uses 64-bit operations)
Collision resistance	2^128	2^256

When to Use SHA-256

• Bitcoin and blockchain: Bitcoin's proof-of-work uses double SHA-256.
• TLS certificates: Most SSL certificates use SHA-256 for signing.
• File integrity: Checksums for downloads and package verification.
• JWT tokens: HS256 (HMAC-SHA256) is the most common JWT signing algorithm.

When to Use SHA-512

• Password hashing (as part of bcrypt/scrypt): Longer hash provides more entropy input.
• Digital signatures: When extra collision resistance matters.
• 64-bit systems: SHA-512 is actually faster than SHA-256 on modern 64-bit processors.
• Long-term security: Larger output provides more margin against future attacks.

Generate Hash Online

Use our SHA-256 Hash Generator or SHA-512 Hash Generator to hash text instantly. For passwords, use Bcrypt Generator which includes salting. Browse all Hash Generators including MD5, SHA-1, SHA-3, and RIPEMD-160.