Bcrypt Generator
Generate and verify bcrypt password hashes
Verify Password
About the Bcrypt Generator
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 expensive, making brute-force attacks against hashed passwords impractical. The Bcrypt Generator on UniversalDevTools.in is a professional-grade utility that generates secure bcrypt password hashes and verifies passwords against existing hashes, essential for developers implementing secure authentication systems.
Bcrypt automatically handles salt generation, creating a unique salt for each password hash. This prevents rainbow table attacks where attackers use precomputed hash tables to quickly crack passwords. The adjustable cost factor (also called work factor or rounds) controls how computationally expensive hashing is—higher cost factors take longer to compute but provide better security. The default cost factor of 10 is recommended for most applications, but can be increased for higher security requirements.
For developers building authentication systems, bcrypt is the industry standard for password storage. Unlike MD5 or SHA-1 which are fast and vulnerable to brute-force attacks, bcrypt is intentionally slow, making it computationally infeasible to crack passwords even with modern hardware. The password verification feature allows you to test if a plaintext password matches a stored hash, essential for login system development and testing.
Security testing is another critical use case. Developers need to verify that password hashing works correctly, that cost factors are appropriate, and that password verification functions properly. This tool provides a safe environment to test password hashing without exposing real user credentials or risking security vulnerabilities.
All password hashing and verification happens entirely in your browser using JavaScript bcrypt libraries. Your passwords, hashes, and authentication data never leave your device or get transmitted to external servers. This privacy-first approach ensures complete confidentiality for sensitive credentials, making it safe to test password hashing for any security-sensitive application.
features
- Bcrypt hash generation with automatic salt creation
- Adjustable cost factor (4-31) for different security levels
- Password verification testing plaintext against stored hashes
- Secure salt generation ensuring unique hashes for each password
- Support for standard bcrypt hash format
- Real-time hash generation and verification
- Industry-standard password hashing algorithm
- 100% client-side processing—your passwords never leave your browser
use cases
- User authentication systems requiring secure password storage
- Password storage security implementing best practices
- Login system development and password verification testing
- Security testing ensuring password hashing works correctly
- Hash verification comparing passwords against stored hashes
- Password migration from insecure hashing algorithms
- Multi-factor authentication system development
- API authentication with password-based credentials
- Database password field design and implementation
- Security audit and password policy compliance
why use it
- Complete privacy—no passwords sent to servers
- Configurable security level with adjustable cost factors
- Free unlimited usage with no registration required
- Industry-standard hashing following security best practices
- Cross-platform compatibility on all devices and browsers
- Works offline once the page is loaded
- Educational resource for understanding password security
- Saves time compared to setting up bcrypt in development environments
How to use the Bcrypt Generator
- 01Enter a password to hash
- 02Adjust cost factor (higher = slower but more secure)
- 03Generate the hash
- 04Use the verify section to check passwords
Questions
- What is bcrypt and why is it used for passwords?
- Bcrypt is a password hashing algorithm designed to be slow, making brute-force attacks impractical. It automatically handles salting and is the industry standard for secure password storage.
- What cost factor (rounds) should I use?
- A cost factor of 10-12 is recommended for most applications. Higher values are more secure but slower. Test on your server to ensure login times remain acceptable (under 500ms).
- How do I verify a password against a bcrypt hash?
- Enter the stored hash in 'Hash to Verify' and the password to check. Click 'Verify' and the tool will confirm if the password matches using the same bcrypt algorithm.
- Is bcrypt better than MD5 or SHA-256 for passwords?
- Yes, bcrypt is specifically designed for passwords. MD5/SHA are fast hashes meant for data integrity, not password security. Bcrypt's slowness makes brute-force attacks impractical.
- What is a salt in bcrypt?
- A salt is random data added to each password before hashing, ensuring identical passwords produce different hashes. Bcrypt automatically generates and stores a unique salt for each hash.
- Can a bcrypt hash be decrypted or decoded?
- No. Bcrypt is a one-way hash, not encryption, so there is no key and no way to decrypt, decode, or unhash it back to the password. Tools that claim to 'decrypt bcrypt' are only guessing passwords and comparing them. To check a password, verify it against the hash instead.
- How does bcrypt verify a password without decrypting it?
- The hash string stores the algorithm version, cost factor, and salt (for example $2b$10$ followed by 22 salt characters). Verification re-hashes the candidate password with that same salt and cost, then compares the result with the stored hash.