Yes, Bcrypt is a standard, secure password hashing function. It uses a salt and an adaptive cost factor to protect against brute-force attacks.

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Bcrypt Hash Generator

Q: Can I decrypt a Bcrypt hash?

No, Bcrypt is a one-way hash. You cannot reverse it to get the original password; you can only verify if a candidate password matches the hash.

Generate industry-standard secure bcrypt hashes for your database. Industry-standard Blowfish-based hashing with an adaptive cost factor to protect user passwords.

🔑 Hashing Settings

Password to Hash

Hashed locally in your browser - never sent to our server.

Cost Factor (Salt Rounds) 10

4 (Fast) 10 (Best) 15 (Max)

Each increase doubles the hashing time.

🛡️

Client-Side Only

No sensitive data leaves your device.

📋 Bcrypt Hash Result

Algo 2a

Cost 10

Status Secure ✅

🛠️ Integration Snippets

What is Bcrypt?

Bcrypt is a sophisticated password hashing function designed to resist brute-force attacks. Created in 1999 by Niels Provos and David Mazières, it remains the gold standard for password protection in modern applications like Node.js, PHP, and Python.

Blowfish Cipher Adaptive Cost Salt Included Brute-Force Resistant

Why Use Bcrypt?

Industry Standard: Adopted by major frameworks like Laravel, Devise, and Spring Security.
Built-in Salts: Prevents rainbow table attacks automatically for every hash.
Adaptive Security: You can increase the "cost" over time as computer hardware becomes more powerful.
One-Way Function: It is mathematically impossible to "decrypt" a bcrypt hash back into a password.

Understanding the Bcrypt Hash Format

Every bcrypt hash starts with $ signs and contains four distinct parts:

$2a$10$N9qo8uLOickgx2ZMRZoMye.IFdZx1p4L9X7lSJhR6.kMdKgQfQ.JC

$2a$ Algorithm version

$10$ Cost Factor (2^10 iterations)

22 chars Random Salt

31 chars Resulting Hash

Bcrypt vs. Others

Unlike SHA-256 or MD5, which are designed to be extremely fast for data integrity, Bcrypt is designed to be slow. Why? Because hackers can try billions of SHA-256 hashes per second using GPUs, but they can only try a few hundred bcrypt hashes. This speed difference is what keeps your users' accounts safe.

Recommended Salt Rounds

For most web applications in 2024-2025:

Cost 10: Good balance of speed and security (~100ms per hash).
Cost 12: Recommended for modern servers (~500ms per hash).
Cost 13+: Use for highly sensitive systems (Enterprise/Banking).

Bcrypt Frequently Asked Questions

Can I decrypt a bcrypt hash?

No. Bcrypt is a one-way cryptographic hash. To verify a password, you hash the input provided by the user and compare it to the stored hash.

Is Bcrypt quantum-resistant?

While not specifically designed for post-quantum era, symmetric-key algorithms like the underlying Blowfish in Bcrypt are generally considered resilient against known quantum attacks, provided the salt/password entropy is sufficient.

Why does the same password give different hashes?

This is because of the Salt. Bcrypt generates a random 22-character salt for every hash. This ensures that even if two users have the same password, their hashes in the database will look completely different.

Best Practices

✅ Don't roll your own: Use established libraries like bcryptjs, php-bcrypt, or pybcrypt.
✅ Salt is not optional: Always allow the library to generate the salt automatically.
✅ Max Password Length: Note that traditional bcrypt has a 72-character limit on the input password.
✅ Pre-hashing: If you expect very long passwords, consider SHA-256 hashing the password before passing it to Bcrypt.
✅ Verify carefully: Always use the library's verify() or compare() function rather than a simple string comparison.