Bcrypt Hash Generator
DeveloperGenerate secure bcrypt password hashes. Useful for testing authentication systems and storing passwords securely.
Generate Hash
Verify Hash
About Bcrypt
Bcrypt is a password hashing algorithm designed to be slow and computationally expensive, making it resistant to brute-force attacks. The salt rounds parameter controls the work factor - higher values are more secure but slower.
Note
This is a simplified browser-based bcrypt implementation for testing purposes. For production use, always use server-side bcrypt libraries with proper implementations.
What is This Tool?
A bcrypt hash generator creates secure password hashes using the bcrypt algorithm. Bcrypt is a slow, salted hashing function specifically designed for password storage — making brute-force attacks computationally expensive even with modern GPU hardware.
Bcrypt incorporates a configurable work factor (cost parameter, typically 10-12) that controls how many iterations the algorithm performs. Doubling the cost factor doubles the computation time. Each hash includes a random 128-bit salt, preventing rainbow table attacks and ensuring identical passwords produce different hashes.
Common Use Cases
Password Hashing
Generate bcrypt hashes for storing passwords in databases. Verify that your application's bcrypt implementation produces correct output.
Work Factor Tuning
Test different cost factors to find the right balance between security and login performance for your server hardware.
Migration Planning
Generate target bcrypt hashes when migrating from MD5/SHA password storage to bcrypt.
Hash Verification
Verify that a plaintext password matches a stored bcrypt hash — useful for debugging authentication issues.
Frequently Asked Questions
What cost factor should I use?
Start with 10 and increase until hashing takes ~250ms on your server. 12 is common for modern hardware. Higher values are more secure but slower.
Why is bcrypt better than SHA-256 for passwords?
Bcrypt is intentionally slow (configurable), includes automatic salting, and resists GPU/ASIC acceleration. SHA-256 is fast — ideal for hashing data, but that speed helps attackers brute-force passwords.
Should I use bcrypt or Argon2?
Argon2 (2015 PHC winner) is newer and resists GPU attacks better by requiring configurable memory. Bcrypt (1999) is battle-tested and widely supported. Both are good choices; Argon2 is recommended for new projects.