Bcrypt Hash Generator

Generate secure bcrypt password hashes with cost factor customization for maximum security

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Password Security

Industry-standard bcrypt algorithm for secure password storage

⚙️

Cost Factor Control

Adjustable cost factor to balance security and performance

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Built-in Salt

Automatic salt generation for protection against rainbow tables

🔒 Client-Side Processing
All hashing is done in your browser using JavaScript. Your passwords never leave your device, ensuring maximum privacy and security.

Enter password to hash

Cost Factor

Balanced security and performance

Your bcrypt hash will appear here...

Verify Password

Test if a password matches a previously generated bcrypt hash:

Password to verify

Bcrypt hash to compare

💡 For developers: Generate bcrypt hashes with:

password_hash('password', PASSWORD_BCRYPT, ['cost' => 12])

# PHP: Generate bcrypt hash with cost factor 12

bcrypt.hashpw(password.encode('utf-8'), bcrypt.gensalt(rounds=12))

# Python: Generate bcrypt hash with 12 rounds

BCrypt.hashpw(password, BCrypt.gensalt(12))

# Java: Generate bcrypt hash with work factor 12

About Bcrypt Hash Algorithm

Bcrypt is a password hashing function designed by Niels Provos and David Mazières in 1999. It is based on the Blowfish cipher and incorporates a salt to protect against rainbow table attacks. Bcrypt is specifically designed to be computationally expensive, making it resistant to brute-force attacks.

Bcrypt Hash Characteristics

• Adaptive hash function: can be made slower over time as hardware improves
• Built-in salt: automatically generates and stores salt with the hash
• Configurable cost factor: allows balancing security and performance
• 60-character output format: includes algorithm identifier, cost, salt, and hash

Bcrypt Hash Format

        $2b$12$L.gyF/3E0u9S0VUqUMbOS.Xp4o4bWU.tjUqDlN6bqC9Y3Q5Q5Q5QO
    

• $2b$ - Algorithm identifier (bcrypt with specific encoding)
• 12$ - Cost factor (2^12 iterations)
• L.gyF/3E0u9S0VUqUMbOS.Xp4o4bWU.tjUqDlN6bqC9Y3Q5Q5Q5QO - 22-character salt + 31-character hash

Choosing the Right Cost Factor

Cost Factor	Iterations	Recommended Use	Performance
4-8	16-256	Development, testing	Fast
10-12	1,024-4,096	General web applications	Balanced
13-15	8,192-32,768	High-security applications	Slow
16+	65,536+	Offline storage, master passwords	Very Slow

💡 For most web applications, a cost factor of 10-12 provides the best balance between security and user experience. Higher cost factors provide better security but may impact login performance.

Bcrypt vs Other Password Hashing Algorithms

Algorithm	Built-in Salt	Adaptive	GPU Resistance	Recommendation
MD5	❌	❌	❌	Never use for passwords
SHA-256	❌	❌	❌	Not recommended for passwords
PBKDF2	⚠️	⚠️	❌	Acceptable
Bcrypt	✅	✅	✅	Recommended
Argon2	✅	✅	✅	Modern recommended

⚠️ Security Best Practice: Always use dedicated password hashing algorithms like bcrypt or Argon2 for storing passwords. Never use fast hashing algorithms like MD5 or SHA-256 for password storage, as they are vulnerable to brute-force attacks.