MD5 vs SHA-256: Security Comparison
MD5 vs SHA-256: Which Hash Should You Use?
Hash functions are central to software security, but not all hashes are created equal. This guide compares MD5 and SHA-256 to help you choose the right algorithm.
Quick Comparison
| Feature | MD5 | SHA-256 |
|---|---|---|
| Output size | 128 bits (32 hex chars) | 256 bits (64 hex chars) |
| Speed | Very fast | Fast |
| Security | Broken | Secure |
| Collision resistance | No | Yes |
| Year created | 1991 | 2001 |
When to Use MD5
Despite being cryptographically broken, MD5 still has valid use cases:
- File checksums — quick verification that a download isn’t corrupted
- Cache keys — generating unique identifiers for cached content
- Non-security hashing — deduplication, data partitioning
- Legacy systems — interoperability with older systems
When to Use SHA-256
Use SHA-256 for anything security-related:
- Password hashing — as input to key derivation functions (bcrypt, PBKDF2)
- Digital signatures — code signing, certificate verification
- Blockchain — Bitcoin’s proof-of-work algorithm
- Data integrity — verifying file integrity where tampering is a concern
- HMAC — message authentication codes
Try It Yourself
Generate hashes with our Hash Generator — supporting MD5, SHA-1, SHA-256, and SHA-512. You can also use our dedicated MD5 Generator or SHA-256 Generator.