Bcrypt Generator & Checker
Generate and verify bcrypt password hashes securely. Bcrypt is the industry standard for secure password storage and authentication.
Bcrypt Hash Tool
Generate Hash
Verify Hash
Bcrypt Security Tips
- Cost Factor: Use cost 10–12 for production. Higher = more secure but slower.
- Unique Salt: Bcrypt automatically generates unique salts for each hash.
- Verification: Always use the built-in verification function, never compare hashes directly.
- Rehashing: Check whether a hash needs rehashing when cost factors change.
- Storage: Bcrypt hashes are 60 characters long and start with $2y$.
- Hash Format: Valid bcrypt hashes always contain: $2y$10$...
How to Use the Bcrypt Generator & Checker
Generate Hash
Enter your text in the generator section, choose a cost factor (10–12 recommended), and click Generate Hash.
Copy the Hash
Copy the generated bcrypt hash and store it securely in your database.
Verify Hash
To verify a password, enter the original text and the stored hash in the verification section.
What Is Bcrypt?
Bcrypt is a password hashing function designed specifically for secure password storage. Created in 1999, bcrypt remains one of the most trusted algorithms for password security. Unlike fast hash functions like MD5 or SHA-256, bcrypt is intentionally slow, making brute-force attacks impractical. It also includes built-in salting, automatically generating unique values for each hash to prevent rainbow table attacks.
Why Use Bcrypt?
Bcrypt is the industry standard for password hashing for several compelling reasons. Its adaptive cost factor allows you to increase security as hardware improves. Its automatic salting prevents attackers from using precomputed rainbow tables. Its deliberate slowness makes brute-force attacks economically infeasible. When storing user passwords, bcrypt provides the security and peace of mind that fast hash functions cannot.
Key Features
- Hash Generation: Create bcrypt hashes with customizable cost factors.
- Hash Verification: Verify whether a text matches a stored bcrypt hash.
- Cost Factor Control: Choose from cost factors 4–31 (10–12 recommended).
- Hash Analysis: View version, salt, cost, and length of bcrypt hashes.
- Rehash Detection: Check whether a hash needs rehashing based on the current cost.
- Instant Processing: Results appear within moments.
- No Registration Required: Start generating immediately.
- Browser-Based: Your passwords never leave your device.
Understanding Bcrypt Hash Format
A bcrypt hash is a 60-character string with a specific structure:
- $2y$: Algorithm identifier (2y is the current version).
- 10$: Cost factor (10 in this example).
- 22 characters: Base64-encoded salt.
- 31 characters: Base64-encoded hash.
Example: $2y$10$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhWy
Understanding the Cost Factor
The cost factor determines how many times the hashing algorithm runs. Each increment doubles the computation time:
- Cost 4: 16 iterations (very fast, not recommended)
- Cost 8: 256 iterations (fast, minimum acceptable)
- Cost 10: 1,024 iterations (good, recommended minimum)
- Cost 12: 4,096 iterations (very good, recommended for sensitive applications)
- Cost 14+: 16,384+ iterations (excellent but slow)
Choose the highest cost your server can handle without noticeable delays. Most applications use cost 10–12.
How Bcrypt Verification Works
To verify a password, bcrypt extracts the salt and cost from the stored hash, re-hashes the provided password using those parameters, and compares the result. This is why you don't need to store the salt separately—it's embedded in the hash. Always use bcrypt's built-in verification function rather than comparing hashes directly.
Common Use Cases
User Authentication
Store user passwords securely with bcrypt hashing.
API Key Storage
Hash API keys and tokens before storing them in databases.
Session Token Protection
Hash session tokens to prevent session hijacking if databases are compromised.
Security Testing
Test password policies and authentication systems with bcrypt hashes.
Best Practices for Bcrypt
Use cost factor 10–12 for most applications. Never store plain-text passwords—always hash with bcrypt. Use bcrypt's verification function, never compare hashes directly. Check whether hashes need rehashing when you update cost factors. Store bcrypt hashes in a database column of at least 60 characters. Always use HTTPS to transmit passwords before hashing.
Frequently Asked Questions
What cost factor should I use?
Cost 10–12 is recommended for most applications. Higher costs are more secure but slower.
Can I reverse a bcrypt hash?
No, bcrypt is a one-way hash function. You can only verify whether a password matches a hash.
Is bcrypt better than SHA-256 for passwords?
Yes, bcrypt is specifically designed for password hashing. SHA-256 is designed for speed, which makes it vulnerable to brute-force attacks.
What does "needs rehash" mean?
If the cost factor used to create a hash is lower than your current standard, you should rehash the password when the user next logs in.
Is the tool free?
Yes, ZourTools Bcrypt Generator & Checker is completely free, with no limitations.