SHA-256 vs SHA-512
Differences, use cases, and when to use each
Both are secure members of the SHA-2 family. SHA-256 produces 256-bit hashes; SHA-512 produces 512-bit hashes. SHA-512 can be faster on 64-bit systems but produces longer hashes. Both are considered equally secure for practical purposes.
Quick Comparison
| Feature | SHA-256 | SHA-512 |
|---|---|---|
| Hash Size | 256-bit (64 hex chars) | 512-bit (128 hex chars) |
| Security | 128-bit security level | 256-bit security level |
| Speed (64-bit) | Baseline | Often faster on 64-bit CPUs |
| Output Length | 32 bytes | 64 bytes |
When to Use Each
When to Use SHA-256
Use SHA-256 as the default — it provides 128-bit security which is more than sufficient for all current applications. It's the most widely used and supported variant.
When to Use SHA-512
Use SHA-512 when you need 256-bit security level (extreme margin), when running on 64-bit processors where it may be faster, or when the application specifically requires it.
Pros & Cons
SHA-256
SHA-512
Verdict
SHA-256 for most applications. SHA-512 offers no practical security advantage since 128-bit security is already unbreakable. Choose based on ecosystem conventions.