SHA-256 vs SHA-512
SHA-256 and SHA-512 are both members of the SHA-2 family and are both considered cryptographically secure with no known practical attacks. The main difference is output size: SHA-256 produces a 256-bit (64-character) digest, while SHA-512 produces a 512-bit (128-character) one. Counterintuitively, SHA-512 is often faster on modern 64-bit processors because it operates on 64-bit words, even though it does more work.
| Feature | SHA-256 | SHA-512 |
|---|---|---|
| Output Length | 256 bits (64 hex chars) | 512 bits (128 hex chars) |
| Word Size | 32-bit operations | 64-bit operations |
| Speed (64-bit CPU) | Fast | Often faster on 64-bit hardware |
| Speed (32-bit / embedded) | Faster on constrained devices | Slower on 32-bit systems |
| Security | Secure — no known attacks | Secure — larger margin |
| Collision Resistance | 128-bit security level | 256-bit security level |
| Common Use | TLS, blockchain, file integrity | High-security systems, large data |
| Output Storage | Compact | Twice the storage per hash |
Verdict
Which should you use?
Use SHA-256 for most applications — it is the web standard for TLS certificates, blockchain, and file verification, with a compact output. Choose SHA-512 when you want a larger security margin or are hashing on 64-bit servers where it can be faster. Both are secure; generate either with Quill Tools' free SHA-256 and SHA-512 generators.