Last updated: April 12, 2026
SHA-256 vs SHA-512 — Which Hash Function in 2026?
Quick Answer
SHA-256 produces a 256-bit (32-byte) hash and is the most widely used. SHA-512 produces a 512-bit (64-byte) hash and is faster on 64-bit processors. Both are secure. SHA-256 is the standard for most applications; SHA-512 for higher security margins.
SHA-256 vs SHA-512 — Side by Side
| Feature | SHA-256 | SHA-512 |
|---|---|---|
| Output Size | 256 bits (32 bytes, 64 hex chars) | 512 bits (64 bytes, 128 hex chars) |
| Security Level | 128-bit collision resistance | 256-bit collision resistance |
| Performance (64-bit) | Slower on 64-bit CPUs | Faster on 64-bit CPUs (wider operations) |
| Performance (32-bit) | Faster on 32-bit CPUs | Slower on 32-bit CPUs |
| Used By | Bitcoin, SSL/TLS, Git | Some TLS ciphers, Linux crypt |
| Storage | 32 bytes per hash | 64 bytes per hash |
Verdict
Use SHA-256 as the default — it is the industry standard, sufficient for all practical security needs, and used by Bitcoin, Git, and TLS. Use SHA-512 when processing on 64-bit systems where its speed advantage matters, or when you want extra security margin.
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