If your application stores passwords with MD5 or SHA-256, they can be cracked in minutes using rainbow tables and GPU clusters. Bcrypt was specifically designed for password hashing — it's intentionally slow and includes built-in salting to make every hash unique.
What Is Bcrypt Hash Generator?
Bcrypt is an adaptive password hashing function based on the Blowfish cipher. Its cost factor determines how many iterations to perform — higher costs take exponentially longer, keeping pace with hardware improvements. Our Bcrypt Generator creates hashes with customizable cost factors.
How to Use Bcrypt Hash Generator on DevToolHub
- Open the Bcrypt Hash Generator tool on DevToolHub — no signup required.
- Paste or enter your input data in the left panel.
- See the result instantly in the output panel.
- Copy the result or download it as a file.
Bcrypt Hash Structure
Understanding the anatomy of a bcrypt hash:
// Hashing "mypassword" with cost 12
$2b$12$LJ3m4ys3Lk0TSwMvnHB5v.XyZ1a2b3c4d5e6f7g8h9i0j1k2l3m4n5
│ │ │ │
│ │ │ └── hash (31 chars)
│ │ └── salt (22 chars, auto-generated)
│ └── cost factor (12 = 2^12 iterations)
└── algorithm version ($2b)
// Same password, different hash each time (due to random salt):
$2b$12$abc...xyz ← first hash
$2b$12$def...uvw ← different salt, different hash
// Both verify correctly against "mypassword"Pro Tips
- Use cost factor 12+ in production — increase as hardware gets faster
- Bcrypt has a 72-byte input limit — for longer passwords, pre-hash with SHA-256
- Never compare bcrypt hashes directly — use bcrypt.compare() which handles the salt
- Migrating from MD5? Hash the MD5 hash with bcrypt: bcrypt(md5(password))
When You Need This
- Storing user passwords in registration and authentication systems
- Upgrading legacy password storage from MD5/SHA to bcrypt
- Implementing password reset flows with secure hash comparison
- Load testing authentication endpoints with realistic bcrypt timing
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