MD5 vs SHA-256
Which hash function should you use in 2026? Speed, collision resistance and modern recommendations compared.
Reviewed by The Markvibe Team · Last updated 2026-06-28
MD5 and SHA-256 are both cryptographic hash functions, but they live in very different threat models. MD5 (128-bit, designed 1991) is broken for collision resistance and unsafe for anything security-related. SHA-256 (256-bit, part of the SHA-2 family) is the modern default for digital signatures, JWTs and integrity checks.
Side-by-side comparison
| Feature | MD5 | SHA-256 |
|---|---|---|
| Output length | 128 bits (32 hex chars) | 256 bits (64 hex chars) |
| Collision resistance | Broken since 2004 | No practical attacks |
| Speed (relative) | ≈2× faster | Baseline |
| Use for passwords | ❌ No | ❌ No — use bcrypt/argon2 |
| Use for file checksums | OK for non-adversarial | ✅ Preferred |
| Use for signing / JWT | ❌ No | ✅ Yes (HS256) |
Our recommendation
Use SHA-256 for anything new. Keep MD5 only for non-security checksums against trusted sources.
Try
MD5 tool →
Try
SHA-256 tool →
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