Bcrypt Hash Generator
LiveGenerate and verify bcrypt password hashes with configurable salt rounds.
Understanding Bcrypt Password Hashing
Bcrypt is a password hashing function based on the Blowfish cipher, designed specifically to be computationally expensive and resistant to brute-force attacks. Unlike fast hash functions (MD5, SHA-256) which can be computed billions of times per second on modern GPUs, bcrypt includes a configurable cost factor that exponentially increases computation time — making each hash attempt deliberately slow. The function also generates a unique random salt for every hash, ensuring identical passwords produce different hashes and preventing rainbow table attacks.
Generate bcrypt password hashes for secure password storage. Configure the number of salt rounds (cost factor) from 4 to 16, generate hashes from plain text passwords, and verify passwords against existing bcrypt hashes. Uses the standard bcrypt algorithm compatible with PHP, Node.js, Python, Ruby, and Go implementations.
The Devkitr Bcrypt Hash Generator creates bcrypt hashes from password strings with configurable cost factors. Enter a password and select the work factor (salt rounds) to generate a production-ready bcrypt hash. The tool also supports verifying a password against an existing bcrypt hash to test your application's authentication logic.
In a typical development workflow, Bcrypt Hash Generator becomes valuable whenever you need to generate and verify bcrypt password hashes with configurable salt rounds. Whether you are working on a personal side project, maintaining production applications for a company, or collaborating with a distributed team across time zones, having a reliable browser-based generation tool eliminates the need to install desktop software, write one-off scripts, or send data to third-party services that may log or retain your information. Since Bcrypt Hash Generator processes everything locally on your device, your data stays private and your workflow stays uninterrupted — open a browser tab, paste your input, get your result.
Key Features
Configurable Cost Factor
Adjust the work factor from 4 to 16 rounds — each increment doubles computation time, letting you balance security strength against login response time.
Built-in Salt Generation
Automatically generates a cryptographically random 128-bit salt for each hash, embedded in the output string. No manual salt management required.
Hash Verification Mode
Enter a password and an existing bcrypt hash to verify whether they match — useful for testing authentication logic and debugging login failures.
Cost Factor Timing Display
Shows the approximate computation time for the selected cost factor, helping you choose an appropriate value for your server's performance profile.
How to Use Bcrypt Hash Generator
Enter a Password
Type the password string you want to hash for storage in a user database or authentication system.
Select Work Factor
Choose the cost factor (10-12 is recommended for production). Higher values increase security but also increase hash computation time.
Generate the Hash
Click generate to produce the bcrypt hash. The output includes the algorithm version, cost factor, salt, and hash in a single string.
Store or Verify
Copy the hash for database storage, or use the verification mode to test if a password matches an existing hash.
Use Cases
User Registration Systems
Generate bcrypt hashes for new user passwords during registration, producing hashes safe for storage in your user database.
Testing Authentication Flows
Create test user entries with known bcrypt-hashed passwords to verify your login system correctly validates credentials.
Migrating from MD5/SHA Password Storage
Generate bcrypt hashes as replacement values when upgrading legacy systems from insecure MD5 or SHA-based password storage.
Evaluating Cost Factor Impact
Test different cost factors to find the right balance between security (higher is better) and user experience (login latency).
Pro Tips
Use cost factor 10-12 for most web applications — this provides strong security while keeping hash computation under 500ms on typical server hardware.
Increase the cost factor by 1 every 18-24 months to keep pace with hardware improvements — Moore's Law means attackers get faster too.
Never store plain passwords alongside bcrypt hashes for "recovery purposes" — bcrypt is intentionally irreversible. Implement password reset flows instead.
Test bcrypt timing on your actual production server — cloud instances have different CPU performance than development machines, affecting optimal cost factor selection.
Common Pitfalls
Using cost factor below 10 in production
Fix: Cost factors below 10 are too fast for modern GPUs to brute-force. Use at least 10 (approximately 100ms per hash) and preferably 12 for new applications.
Implementing a custom salt instead of using bcrypt's built-in salt generation
Fix: Bcrypt generates cryptographically random salts automatically. Custom salt implementations often use weak randomness or reuse salts, defeating their purpose.
Truncating passwords before hashing with bcrypt
Fix: Standard bcrypt has a 72-byte input limit. If your application accepts longer passwords, pre-hash with SHA-256 before bcrypt, or use Argon2 which has no practical length limit.
Frequently Asked Questions
QWhat salt rounds should I use?
The default of 10 rounds provides a good balance between security and performance. Use 12+ for higher security but expect slower hashing.
QIs the hash generated client-side?
Yes. All hashing is done in your browser. Your password never leaves your device.
QCan I verify an existing hash?
Yes. Enter a password and a bcrypt hash to verify whether they match.
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