Generate strong, cryptographically secure password hashes using industry-standard Bcrypt and Argon2 algorithms. Our free online hash generator is designed for developers, security professionals, and anyone who needs to test password security implementations.
Password hashing is a one-way cryptographic function that transforms passwords into fixed-length strings of characters. Unlike encryption, hashing cannot be reversed, making it the ideal method for storing passwords securely in databases. When a user logs in, their entered password is hashed and compared to the stored hash, ensuring that actual passwords are never stored in plain text.
Switch seamlessly between Bcrypt and Argon2 hashing algorithms based on your security requirements and project specifications.
Fine-tune your hashing configuration with adjustable cost factors, memory usage, time iterations, and parallelism settings to balance security and performance.
Generate cryptographically secure password hashes in real-time directly in your browser. No server-side processing means your passwords never leave your device.
Verify passwords against existing hashes to test your authentication logic or validate hash integrity during development and security audits.
All hashing and verification operations occur locally in your browser using WebAssembly, ensuring your sensitive data remains private and secure.
Clean, intuitive interface designed for developers with clear labeling, responsive design, and easy-to-copy hash outputs.
Both Bcrypt and Argon2 are purpose-built password hashing algorithms designed to resist brute-force attacks. Unlike fast hashing algorithms like MD5 or SHA-1, these algorithms are intentionally slow and resource-intensive, making them exponentially more difficult for attackers to crack.
Bcrypt Benefits:
Battle-tested algorithm used since 1999
Adaptive cost factor that grows with computing power
Built-in salt generation
Wide support across programming languages and frameworks
Industry-standard for web applications
Argon2 Benefits:
Winner of the 2015 Password Hashing Competition
Resistance to GPU and ASIC cracking attempts
Configurable memory hardness
Three variants: Argon2d, Argon2i, and Argon2id
Recommended by security experts for new applications
Generating a Hash:
Enter the password you want to hash in the "Password to Hash" field
Select your preferred algorithm (Bcrypt or Argon2)
Adjust the security parameters based on your requirements
Click "Generate Hash" to create your secure hash
Copy the generated hash for use in your application
Verifying a Hash:
Scroll to the "Verify Hash" section
Enter the original password in the "Password" field
Paste the hash you want to verify in the "Hash" field
Click "Verify" to check if the password matches the hash
Bcrypt Rounds (Cost Factor) The number of iterations the algorithm performs. Each increment doubles the computation time. Range: 4-16. Recommended: 10-12 for most applications.
Argon2 Memory Cost The amount of memory (in KB) required to compute the hash. Higher values increase resistance to parallel cracking. Default: 65536 KB (64 MB).
Argon2 Time Cost The number of iterations the algorithm performs. Higher values increase computation time and security. Default: 3 iterations.
Argon2 Parallelism The number of parallel threads used during hashing. Affects both speed and memory requirements. Default: 4 threads.
Choose Appropriate Cost Factors Balance security with user experience. Higher cost factors provide better protection but increase login times. Test with your target hardware to find optimal settings.
Use Unique Salts Both algorithms automatically generate unique salts for each password. Never reuse salts or implement custom salting mechanisms.
Regular Security Audits Periodically review and update your hashing parameters as computing power increases. What was secure five years ago may need adjustment today.
Never Store Plain Passwords Always hash passwords before storage. Never log, display, or transmit passwords in plain text, even in development environments.
Implement Rate Limiting Combine strong hashing with login attempt throttling and account lockouts to prevent brute-force attacks at the application level.
Keep Libraries Updated Regularly update your password hashing libraries to benefit from security patches and improvements.
Web Application Development Test password hashing implementations during development before deploying to production environments.
Security Testing Verify that your authentication system correctly generates and validates password hashes.
Database Migration Generate sample hashes when migrating between different hashing algorithms or updating cost factors.
Educational Purposes Learn how password hashing works and understand the impact of different parameters on hash generation.
API Development Create test credentials and validate hash-based authentication flows in your API endpoints.
Choose Bcrypt if:
You're working with legacy systems or established codebases
You need maximum compatibility across platforms and languages
You prefer a simpler configuration with fewer parameters
Your framework or library has native Bcrypt support
Choose Argon2 if:
You're starting a new project from scratch
You need enhanced resistance to GPU/ASIC attacks
Memory-hard functions align with your security requirements
You want the most modern, competition-vetted algorithm
Both algorithms are excellent choices for password security. The most important factor is using a proper password hashing algorithm rather than choosing between these two specifically.
Bcrypt Algorithm:
Based on the Blowfish cipher
Generates 60-character hash strings
Hash format: 2a2a 2a[cost]$[22 character salt][31 character hash]
Default cost factor: 10 (2^10 = 1,024 iterations)
Argon2 Algorithm:
Uses the Argon2id variant (hybrid of Argon2i and Argon2d)
Configurable output length (default: 32 bytes)
Hash format: argon2idargon2id argon2idv=19m=[memory],t=[time],p=[parallelism]m=[memory],t=[time],p=[parallelism] m=[memory],t=[time],p=[parallelism][salt]$[hash]
Designed to resist both side-channel and GPU attacks
While this tool uses proper cryptographic libraries and runs entirely in your browser, we recommend using it only for testing and development. For production password hashing, implement hashing on your secure backend servers.
No. Password hashing is a one-way function. It's cryptographically infeasible to reverse a properly generated Bcrypt or Argon2 hash to retrieve the original password.
This is intentional. Password hashing algorithms are designed to be computationally expensive to resist brute-force attacks. The time delay you experience is the same delay an attacker would face when trying billions of password combinations.
Encryption is reversible with the correct key, while hashing is a one-way function that cannot be reversed. Passwords should always be hashed, never encrypted.
Aim for the highest cost factor that doesn't negatively impact user experience. A general rule is that hashing should take 250-500ms on your production server hardware.
Yes. Both Bcrypt and Argon2 are widely supported across virtually all programming languages including Python, PHP, Node.js, Java, Ruby, Go, and .NET.
For password storage, you should use specialized password hashing algorithms like bcrypt, scrypt, or Argon2, which are specifically designed for this purpose. If you must use a general hash function, SHA-256 with proper salting is the minimum recommendation.
Secure password storage is fundamental to application security. By using modern hashing algorithms like Bcrypt and Argon2 with appropriate cost factors, you significantly reduce the risk of password compromise in the event of a database breach. This tool provides a convenient way to test, verify, and understand password hashing for your development and security testing needs.
Remember: the strength of your password hashing is only as good as your implementation. Always follow security best practices, keep your dependencies updated, and conduct regular security audits of your authentication systems.