Bcrypt Generator
Generate secure password hashes using Web Crypto API with bcrypt-like functionality
Generate Bcrypt Hash
4 (Fast)
10 (Default)
15 (Slow)
Higher values = more secure but slower
Verify Password
Understanding Bcrypt
What is Bcrypt?
Bcrypt is a password hashing function designed to be slow and computationally expensive, making it resistant to brute-force attacks.
It uses a salt to prevent rainbow table attacks and has an adjustable cost parameter to scale with computing power.
Hash Format
$2a$12$saltAndHash
│││└─ Hash (31 chars)
││└─ Salt (22 chars)
│└─ Cost (work factor)
└─ Algorithm version
│││└─ Hash (31 chars)
││└─ Salt (22 chars)
│└─ Cost (work factor)
└─ Algorithm version
Cost Factor Guide
Cost 4:
~0.0015s (Too Fast)
Cost 8:
~0.025s (Fast)
Cost 10:
~0.1s (Recommended)
Cost 12:
~0.4s (Good)
Cost 15:
~3.2s (Very Secure)
Recommendation: Use cost 12 for most applications. Increase if your server can handle longer hash times.
Batch Operations
Batch Hash Generation
Generated Hashes
Batch results will appear here...
Implementation Examples
PHP Implementation
// Hash a password
$password = 'user_password';
$hash = password_hash($password, PASSWORD_BCRYPT, [
'cost' => 12
]);
// Verify a password
$is_valid = password_verify($password, $hash);
if ($is_valid) {
echo "Password is correct!";
} else {
echo "Invalid password!";
}Node.js Implementation
const bcrypt = require('bcrypt');
// Hash a password
const password = 'user_password';
const saltRounds = 12;
bcrypt.hash(password, saltRounds, (err, hash) => {
// Store hash in database
});
// Verify a password
bcrypt.compare(password, hash, (err, result) => {
if (result) {
console.log("Password is correct!");
} else {
console.log("Invalid password!");
}
});Security Features
- 🔐 Adjustable cost factor for future-proofing
- 🧂 Built-in salt generation prevents rainbow tables
- ⏱️ Intentionally slow to resist brute-force attacks
- 🔄 Each hash is unique even for the same password
- 📊 Real-time hash verification
- 📦 Batch processing for multiple passwords
Best Practices
- ✅ Never store plain text passwords
- ✅ Use cost factor 10-12 for most applications
- ✅ Always verify passwords using bcrypt compare
- ✅ Consider server performance when choosing cost
- ✅ Increase cost factor as hardware improves
- ✅ Use HTTPS when transmitting passwords