Compare SHA-256 and SHA-512 hash algorithms. Learn the differences in security, speed, and output size, and when to use each for file verification, passwords, and digital signatures.
SHA-256 and SHA-512 are both members of the SHA-2 family of cryptographic hash functions. They do the same thing - create a fixed-size fingerprint of any input - but with different characteristics. Here's how to choose between them.
Key Differences
- Output size - SHA-256 produces 256-bit (32 byte) hashes. SHA-512 produces 512-bit (64 byte) hashes.
- Speed - On 64-bit systems, SHA-512 is often faster than SHA-256 because it processes 64-byte blocks compared to SHA-256's 32-byte blocks.
- Security margin - SHA-512 has a larger security margin against future attacks due to its larger output.
When to Use Each
SHA-256 is the industry standard. Used by TLS certificates, blockchain (Bitcoin), file integrity verification, and most security applications. It's well-supported everywhere and unlikely to cause compatibility issues.
SHA-512 is preferred when maximum security margin matters - government applications, long-term archiving, or when hashing large files on 64-bit systems where it's actually faster.
Use our SHA-256 Generator or SHA-512 Generator to test both on your data.