Bcrypt Generator/Tester
Generate and test Bcrypt password hashes
Bcrypt Generator
Generate and test bcrypt password hashes
Generate Hash
Higher rounds = more secure but slower (10 is standard)
Test Hash
About Bcrypt
Bcrypt is a password hashing function designed for securely storing passwords. It incorporates a salt and is intentionally slow to prevent brute-force attacks. The cost factor (rounds) determines the computational complexity.
Note: This is a demonstration tool. For production use, always use a proper bcrypt library on the server side.
Privacy & Security
All bcrypt hashing and password verification happens entirely in your browser using cryptographically secure libraries. Passwords, hashes, and all data are never transmitted to any server, stored, or logged anywhere. Your sensitive data remains completely private and secure.
About This Bcrypt Generator
Implement secure password hashing with our free bcrypt generator. Bcrypt is the industry-standard algorithm for securely storing passwords in databases, used by major platforms worldwide for its resistance to brute-force attacks. Unlike simple MD5 or SHA hashes which can be cracked in seconds, bcrypt includes a salt and is intentionally slow, making password cracking exponentially more difficult. Our tool lets you generate bcrypt hashes with customizable work factors (salt rounds), verify passwords against existing hashes, and understand how bcrypt protects user credentials. Whether you're developing a web application, testing authentication systems, or learning about secure password storage, this tool provides everything you need to work with bcrypt hashing safely and effectively.
Key Features
Adjustable Salt Rounds
Configure work factor from 4 to 16 rounds to balance security and performance
Hash Generation
Generate bcrypt hashes instantly with automatic salt generation
Password Verification
Verify plaintext passwords against existing bcrypt hashes
Cost Calculator
See computation time for different salt rounds to choose optimal settings
Multiple Hash Formats
Support for standard bcrypt output format ($2a$, $2b$, $2y$ variants)
Batch Processing
Generate multiple hashes at once for testing or migration purposes
Security Strength Meter
Visual indicator showing hash strength based on rounds and password complexity
Code Examples
Get implementation code snippets for popular languages (Node.js, Python, PHP, Java)
Migration Helper
Tools to help migrate from MD5/SHA to bcrypt in existing applications
Client-Side Processing
All hashing happens in browser - passwords never leave your device
How to Use the Bcrypt Generator
Enter Your Password
Type the password you want to hash or verify in the input field
Select Salt Rounds
Choose the number of rounds (10-12 recommended for production use)
Generate or Verify
Click 'Generate Hash' to create a new hash, or paste an existing hash to verify
Copy and Implement
Copy the hash to your database or use verification result in your code
Frequently Asked Questions
What is bcrypt and why should I use it?
Bcrypt is a password hashing algorithm designed specifically for securely storing passwords. It's intentionally slow and includes automatic salt generation, making it extremely resistant to brute-force and rainbow table attacks. Unlike fast hashing algorithms like MD5 or SHA1 (which were never designed for passwords), bcrypt's computational cost makes cracking passwords impractical even with modern hardware.
What are salt rounds and how many should I use?
Salt rounds (work factor) determine how many times the bcrypt algorithm runs, exponentially increasing computation time. Each increment doubles the time. For production systems, use 10-12 rounds. Higher values (13-15) offer more security but slower performance. As computers get faster, you can gradually increase rounds. Never use less than 10 rounds in production.
Can I decrypt a bcrypt hash to get the original password?
No. Bcrypt is a one-way hashing function, not encryption. You cannot reverse a bcrypt hash to obtain the original password - this is by design. To verify a password, you hash the attempted password with the same salt and compare the resulting hashes. If they match, the password is correct.
What's the difference between $2a$, $2b$, and $2y$ prefixes?
$2a$ is the original bcrypt format. $2b$ fixes a rare bug in the $2a$ implementation. $2y$ is used by PHP's crypt() function. In practice, they're compatible and equally secure. Modern implementations use $2b$. You can verify passwords hashed with any variant.
How long does bcrypt take to compute?
Computation time depends on salt rounds: 10 rounds â 100ms, 12 rounds â 400ms, 14 rounds â 1.6 seconds. This is intentional - the delay is imperceptible during normal login (once per user) but makes brute-force attacks impractical (millions of guesses required). Balance security needs with user experience.
Is it safe to use this tool for production passwords?
While all processing happens in your browser (passwords are never sent to servers), we recommend generating production password hashes in your application's backend for the most secure workflow. Use this tool for testing, development, verification, and learning how bcrypt works.
Why does the same password generate different hashes?
This is normal and correct behavior! Each bcrypt hash includes a randomly generated salt, so the same password produces a different hash each time. This prevents attackers from identifying users with identical passwords. The salt is embedded in the hash string, allowing verification to work correctly.
Are my passwords stored or logged?
No. All bcrypt hashing and verification happens entirely in your browser using JavaScript. Passwords and hashes are never transmitted to any server, stored anywhere, or logged. Your passwords remain completely private.
Common Use Cases
- User Registration Systems: Hash user passwords during registration before storing them in your database to protect credentials if the database is compromised.
- Authentication Testing: Generate test password hashes for development and QA environments to test login functionality without using real passwords.
- Password Migration: Generate bcrypt hashes when migrating from legacy hashing algorithms (MD5, SHA1) to modern, secure password storage.
- API Development: Hash API keys and secrets before storage, providing an additional security layer for authentication tokens.
- Security Audits: Test and verify that your application's password hashing implementation matches expected bcrypt behavior.
- Learning & Education: Understand how bcrypt works, experiment with different salt rounds, and see the impact on security and performance.
- Database Seeding: Generate hashed passwords for database seed files and test fixtures without hardcoding plaintext passwords.
- Password Policy Testing: Verify that weak passwords still produce strong hashes, demonstrating why client-side password strength matters.
Why Use Our Bcrypt Generator?
Password security is non-negotiable in modern applications. A single database breach with poorly hashed passwords can compromise thousands of user accounts across multiple services (due to password reuse). Our bcrypt generator helps you implement industry-standard password security correctly, whether you're building a new application or improving an existing one. With adjustable salt rounds, instant verification, and educational features, you can understand and implement bcrypt properly. The tool runs entirely in your browser, ensuring your passwords never leave your device - a critical security consideration when working with sensitive data. Use it for development, testing, learning, or migrating to bcrypt from weaker hashing algorithms. Free, fast, and following security best practices.