bcrypt Password Hasher & Verifier Tool

Generate secure bcrypt password hashes with customizable salt rounds or verify existing passwords against bcrypt hashes. bcrypt is an adaptive cryptographic hash function specifically designed for password storage, featuring built-in salt generation and configurable work factor for future-proof security.

Operation Mode

bcrypt Algorithm Info

Hash Length: 60 characters
Security Level: Production Ready
Use Case: Password Storage

Salt Rounds Configuration

12
Iterations: 4,096
Est. Time: ~10ms

Password

Enter password to generate secure bcrypt hash
0 characters
Password Strength:

bcrypt Hash

Generated bcrypt hash with salt

Hash Statistics

0
Password Length
0
Input Bytes
0
Hash Length
12
Salt Rounds
4,096
Iterations

Quick Examples

Production-Ready Password Security

bcrypt is the industry standard for secure password storage, specifically designed to protect against modern attack methods and future hardware improvements.

Key Features:
  • • Adaptive cost factor (salt rounds)
  • • Built-in salt generation and storage
  • • Resistance to rainbow table attacks
  • • Configurable security-performance balance
Perfect For:
  • • User authentication systems
  • • Web application login security
  • • Database password storage
  • • Enterprise security compliance

bcrypt Hash Format

$2a$12$R9h/cIPz0gi.URNNX3kh2OPST9/PgBkqquzi.Ss7KIUgO2t0jWMUW
$2a$
Algorithm Version
12$
Salt Rounds
22 chars salt + 31 chars hash
Salt + Hash Data

What is bcrypt?

bcrypt is an adaptive cryptographic hash function specifically designed for password hashing. Unlike general-purpose hash functions, bcrypt incorporates a configurable work factor (salt rounds) that makes it computationally expensive and resistant to brute-force attacks as computing power increases.

Key characteristics of bcrypt:

  • Adaptive cost: Configurable salt rounds (4-31)
  • Built-in salt: Automatic salt generation and storage
  • Future-proof: Adjustable difficulty as hardware improves
  • Password-specific: Designed exclusively for password storage
  • Deterministic output: Same password + salt = same hash
  • Fixed format: 60-character string with embedded metadata

Example: "password123" → "$2a$12$R9h/cIPz0gi.URNNX3kh2OPST9/PgBkqquzi.Ss7KIUgO2t0jWMUW"

bcrypt password hashing example showing adaptive cost and salt integration
bcrypt hash structure and salt rounds visualization

✅ Password Storage Gold Standard

bcrypt is the recommended choice for password hashing in web applications:

  • Industry standard: Used by major frameworks and platforms
  • Proven security: Battle-tested against real-world attacks
  • Built-in protection: Automatic salt generation prevents rainbow tables
  • Adaptive security: Increase rounds as hardware improves

Perfect for user authentication, login systems, and secure password storage.

Features of Our bcrypt Tool:

  • Secure hash generation - Production-ready bcrypt implementation
  • Password verification - Verify passwords against existing hashes
  • Configurable rounds - Adjust salt rounds from 4 to 18
  • Password strength analysis - Real-time strength assessment
  • Performance estimates - Time cost for different round settings
  • Format validation - Verify bcrypt hash format correctness
  • Educational examples - Common password demonstrations
  • Security best practices - Comprehensive implementation guidance

How to Use the bcrypt Tool

1. Choose Operation Mode

Select "Generate Hash" to create bcrypt hashes from passwords, or "Verify Password" to check a password against an existing bcrypt hash.

2. Configure Salt Rounds

In hash mode, adjust the salt rounds (4-18) based on your security requirements. Higher rounds mean better security but slower processing.

3. Enter Password

Type your password in the input field. The tool will show password strength analysis and generate the hash automatically.

4. Use in Production

Copy the generated hash for use in your application's user database. bcrypt is production-ready and secure for real applications.

Understanding Salt Rounds

Rounds Iterations Estimated Time Security Level Use Case
4 16 < 1ms Basic Testing only
8 256 ~1ms Low Legacy systems
12 4,096 ~10ms Recommended Web applications
15 32,768 ~100ms High High-security apps
18 262,144 ~1s Very High Maximum security

bcrypt Hash Examples

Password Rounds bcrypt Hash (example)
password123 12 $2a$12$R9h/cIPz0gi.URNNX3kh2OPST9/PgBkqquzi.Ss7KIUgO2t0jWMUW
MySecurePass! 12 $2a$12$LQv3c1yqBWVHxkd0LHAkCOYz6TtxMQhmIlcxJ95YFsw9OjDNBhT7e
admin 10 $2a$10$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhWy
Tr0ub4dor&3 15 $2a$15$k5UJtE2YFgSK1LgHMSf1mODdJcHxvfI9RdgeEWdNBRXNTGGo/xb/G

⚠️ Important Notes

  • Different salts = different hashes: Same password generates different hashes each time
  • Salt is embedded: The hash contains the salt, so you only need to store the hash
  • Example hashes above are for demonstration: Actual hashes will be different due to random salts
  • Never hardcode hashes: Always generate hashes dynamically in your application

bcrypt Security Applications

Web Applications

  • User registration: Hash passwords during signup
  • Login authentication: Verify passwords against stored hashes
  • Password changes: Generate new hashes for updated passwords
  • Admin systems: Secure administrative account passwords
  • API authentication: Hash API keys and tokens
  • Session management: Secure session token storage

Enterprise Systems

  • Employee portals: Secure internal authentication
  • Database security: Hash sensitive data fields
  • Identity management: LDAP and Active Directory integration
  • Compliance requirements: Meet security standards (GDPR, HIPAA)
  • Multi-factor auth: Secure backup authentication methods
  • Service accounts: Hash automated system passwords

bcrypt vs Other Password Hashing Methods

Method Salt Handling Adaptive Cost Security Recommendation
Plain Text None No None Never use
MD5 + Salt Manual No Broken Avoid
SHA-256 + Salt Manual No Too Fast Not Ideal
PBKDF2 Manual Yes Good Acceptable
bcrypt Automatic Yes Excellent Recommended
scrypt Automatic Yes Excellent Good Choice
Argon2 Automatic Yes Excellent Newest Standard

bcrypt Best Practices

✅ Recommended Practices

  • Use 12+ salt rounds: Provides good security-performance balance
  • Store only the hash: Never store the original password
  • Implement rate limiting: Prevent brute force attacks on login
  • Use secure libraries: Don't implement bcrypt yourself
  • Regular security audits: Review your authentication code
  • Monitor performance: Adjust rounds based on server capacity

💡 Implementation Tips

  • Handle async operations: bcrypt hashing is CPU-intensive
  • Set appropriate timeouts: Higher rounds take longer
  • Use environment variables: Configure rounds per environment
  • Test performance: Measure hashing time on your hardware
  • Plan for upgrades: Design system to support round increases
  • Consider user experience: Balance security with login speed

Related Security Tools

Explore these related security and hashing tools:

Password Generator

Generate strong, secure passwords before hashing them with bcrypt.

Try our Password Generator →

SHA-256 Hash Generator

Generate SHA-256 hashes for file integrity and digital signatures.

Try our SHA-256 tool →

SHA-512 Hash Generator

Generate SHA-512 hashes for high-security applications.

Try our SHA-512 tool →

Text Analysis Tool

Analyze password complexity and character composition.

Try our Text Analysis tool →

Frequently Asked Questions

Is bcrypt secure for production applications?

Yes, bcrypt is specifically designed for production password storage and is widely used by major applications. It's considered the gold standard for password hashing.

How many salt rounds should I use?

12 rounds is the current recommended minimum for web applications. Consider 15+ rounds for high-security applications, but test performance impact on your servers.

Why does the same password generate different hashes?

bcrypt automatically generates a random salt for each hash, ensuring that identical passwords produce different hashes. This prevents rainbow table attacks.

Can I increase salt rounds for existing hashes?

You can't modify existing hashes, but you can rehash passwords with higher rounds when users log in, gradually upgrading your security over time.

Is bcrypt better than SHA-256 for passwords?

Yes, bcrypt is specifically designed for passwords with built-in salt and adaptive cost. SHA-256 is too fast and requires manual salt implementation.

What's the maximum password length for bcrypt?

bcrypt has a 72-byte limit for input. Most implementations handle this automatically, but very long passwords may be truncated.

Technical Implementation

Our bcrypt tool implements the algorithm using modern JavaScript with proper security practices:

// bcrypt Hash Generation Example
async function hashPassword(password, rounds) {
// Generate salt with specified rounds
const salt = await generateSalt(rounds);
// Hash password with salt
const hash = await bcrypt(password, salt);
return hash; // Format: $2a$rounds$salthash
}
async function verifyPassword(password, hash) {
// Extract salt from stored hash
const salt = extractSalt(hash);
// Hash input password with same salt
const newHash = await bcrypt(password, salt);
return newHash === hash;
}

Key features of our implementation:

  • Secure random salt generation using crypto.getRandomValues()
  • Proper bcrypt format with version identifier ($2a$)
  • Configurable salt rounds with validation (4-18)
  • Constant-time comparison for verification
  • Comprehensive error handling and validation

Password Security Standard

Production Benefits:

  • • Industry-standard password hashing
  • • Built-in salt generation and storage
  • • Adaptive cost for future-proof security
  • • Resistance to rainbow table attacks

Implementation Ready:

  • • Framework integration available
  • • Scalable performance characteristics
  • • OWASP recommended practices
  • • Compliance with security standards