About Bcrypt Password Hashing

Bcrypt is a password hashing function designed by Niels Provos and David Mazières, based on the Blowfish cipher. It's specifically designed to be slow and computationally intensive, making it resistant to brute-force attacks. Our free bcrypt generator makes it easy to create secure password hashes for your applications.

Why Use Bcrypt for Password Hashing?

Built-in Salt: Bcrypt automatically generates a unique salt for each password, preventing rainbow table attacks and ensuring that identical passwords produce different hashes.

Adaptive Cost: The cost factor (or work factor) can be increased over time as computers become faster, ensuring long-term security without changing your code.

Slow by Design: Unlike fast hash functions like MD5 or SHA-1, bcrypt is intentionally slow. This makes brute-force attacks impractical, even with powerful hardware.

Industry Standard: Bcrypt is trusted by major frameworks and companies worldwide, including Ruby on Rails, Django, Spring Security, and many Fortune 500 companies.

Understanding Cost Factor (Rounds)

The cost factor determines how many rounds of hashing are performed. Each increase by 1 doubles the computation time:

Cost 4-6: Very fast but less secure. Only suitable for development/testing.
Cost 8-9: Fast but provides minimal security. Not recommended for production.
Cost 10-12: Recommended for production. Balances security and performance well.
Cost 13-14: Higher security for sensitive applications. Noticeably slower.
Cost 15-16: Maximum security but very slow. Only for extremely sensitive data.

Recommendation: For most web applications, a cost factor of 10-12 provides excellent security while maintaining good user experience.

How Bcrypt Works

When you generate a bcrypt hash, the algorithm:

Generates a random salt (128 bits)
Combines the password with the salt
Runs the Blowfish encryption algorithm multiple times (2^cost rounds)
Produces a final hash that includes the salt and cost factor

The output format is: $2b$[cost]$[22 character salt][31 character hash]

Common Use Cases

User Authentication: Store user passwords securely in databases
API Key Storage: Hash API keys before storing them
Password Reset Tokens: Secure password reset functionality
Application Secrets: Store sensitive configuration data
Two-Factor Authentication: Secure backup codes and recovery keys

How to Use This Tool

Enter the password you want to hash in the password field
Adjust the cost factor slider (10-12 recommended for production)
Click "Generate Bcrypt Hash" to create the hash
Copy the hash using the copy button
To verify a password, enter both the hash and password in the verification section

Best Practices

Never store plain text passwords: Always hash passwords before storing them in your database.

Use appropriate cost factors: Start with 10-12 for production. Monitor performance and increase as hardware improves.

Don't use bcrypt for non-password data: For general hashing needs, use SHA-256. Bcrypt is specifically designed for passwords.

Implement rate limiting: Combine bcrypt with rate limiting on login attempts to prevent brute-force attacks.

Keep your bcrypt library updated: Use the latest version of bcrypt in your programming language to ensure maximum security.

Implementation Examples

Node.js (bcryptjs):

const bcrypt = require('bcryptjs');
const hash = await bcrypt.hash('myPassword', 10);
const isValid = await bcrypt.compare('myPassword', hash);

Python (bcrypt):

import bcrypt
hash = bcrypt.hashpw(b'myPassword', bcrypt.gensalt(10))
is_valid = bcrypt.checkpw(b'myPassword', hash)

PHP:

$hash = password_hash('myPassword', PASSWORD_BCRYPT, ['cost' => 10]);
$is_valid = password_verify('myPassword', $hash);

Security Considerations

Bcrypt has a maximum password length of 72 characters
Always use HTTPS when transmitting passwords
Store hashes in a dedicated security database column
Never log or expose password hashes
Implement proper error handling without revealing hash details
Consider using bcrypt alternatives like Argon2 for new projects

Frequently Asked Questions

Is bcrypt still secure in 2026? Yes, bcrypt remains one of the most secure password hashing algorithms when properly configured with appropriate cost factors.

Can bcrypt hashes be reversed? No, bcrypt is a one-way function. Hashes cannot be reversed to reveal the original password.

How long does bcrypt take? With cost factor 10, it takes about 100ms per hash. With cost 12, about 400ms. This is intentional to prevent brute-force attacks.

Is this tool free? Yes, completely free with no registration required.

Do you store my passwords? No, all processing is done via secure API calls. We never store or log any passwords or hashes.

Why Choose RedoHub Bcrypt Generator?

100% free with no limitations
Adjustable cost factor from 4-16 rounds
Instant hash generation
Built-in password verification
One-click copy to clipboard
Clean, modern interface
Mobile-friendly design
Secure API-based processing
No registration required

Bcrypt Generator