Free Bcrypt Hash Generator — Secure Password Hashing Online
Generate secure Bcrypt password hashes online with adjustable work factors — free, instant, and private.
Calculating heavy hash... this might take a moment.
Generated Hash Output
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How to Generate a Bcrypt Hash
Generating a Bcrypt hash is simple. Type or paste your password into the input field above. Select a Work Factor — this controls how computationally expensive the hash is to generate (higher = more secure but slower). We recommend 12 as the default for most applications. Then click "Generate Bcrypt Hash" and your unique, salted hash will appear instantly. Copy it and store it safely in your database — never store the original password!
What is Bcrypt and Why is it Special?
Bcrypt is a password hashing function designed in 1999 by Niels Provos and David Mazières. Unlike MD5 or SHA-256, Bcrypt was built from the ground up specifically for hashing passwords. Its secret weapon is the cost/work factor — a number that controls how slow the hashing process is. As CPUs get faster, you simply increase the work factor. This means Bcrypt automatically defends against brute-force attacks even as hardware improves. It also automatically generates a unique salt for every hash, so two users with the same password will have completely different hashes in your database.
Understanding the Work Factor (Cost)
- Work Factor 10: Fast — takes ~100ms to hash. Good for testing environments.
- Work Factor 12 (Recommended): Takes ~300ms. The industry standard for production apps in 2024.
- Work Factor 14: Takes ~1 second. Maximum security for highly sensitive data like banking or healthcare.
- Each increment doubles the hashing time. Factor 13 is 2× slower than factor 12.
Bcrypt vs SHA-256 vs MD5 — Which Should You Use for Passwords?
| Algorithm | Designed For | Salting | Use for Passwords? |
|---|---|---|---|
| Bcrypt | Passwords | ✅ Built-in auto salt | ✅ Yes — Best choice |
| Argon2 | Passwords | ✅ Built-in auto salt | ✅ Yes — Modern alternative |
| SHA-256 | Data integrity | ❌ Manual (if any) | ❌ No — Too fast to crack |
| MD5 | Checksums | ❌ Manual (if any) | ❌ Absolutely not |
SHA-256 and MD5 are designed to be fast — which is great for checksums but terrible for passwords. A modern GPU can compute billions of SHA-256 hashes per second. Bcrypt is designed to be slow on purpose, making brute-force attacks impractical.
How to Use Bcrypt in Your Code
Once you understand the concept, implementing Bcrypt in your application is straightforward. Here are examples in the most popular languages:
Node.js
const bcrypt = require('bcrypt');
const hash = await bcrypt.hash(
password, 12
);
// Verify:
const match = await bcrypt.compare(
password, hash
);
Python
import bcrypt salt = bcrypt.gensalt(rounds=12) hashed = bcrypt.hashpw( pwd.encode(), salt ) # Verify: bcrypt.checkpw( pwd.encode(), hashed )
PHP
$hash = password_hash( $password, PASSWORD_BCRYPT, ['cost' => 12] ); // Verify: password_verify( $password, $hash );
Frequently Asked Questions
Can I reverse a Bcrypt hash to get the original password?
No. Bcrypt is a one-way hash function — it is mathematically impossible to reverse. That is the entire point. To verify a password, you use Bcrypt's built-in compare function which re-hashes the input and compares the result. You should never decrypt a Bcrypt hash — if someone tells you they can, they are lying.
Why is a different hash generated every time for the same password?
This is by design. Bcrypt automatically generates a random salt every time you hash a password. The salt is embedded directly into the hash output, so the verify function can extract and use it automatically. This ensures that two users with the same password "abc123" have completely different hashes in your database — protecting everyone if your database is ever leaked.
Is this Bcrypt tool safe to use with real passwords?
Yes, but we still recommend using it primarily for testing and learning. This tool calls our secure server-side API to perform hashing. Your password is sent over an encrypted HTTPS connection and is never stored or logged. However, for ultimate security with production passwords, use Bcrypt libraries directly in your own server environment.
What is the maximum password length for Bcrypt?
Bcrypt has a maximum input length of 72 bytes. For most passwords, this is not an issue since 72 characters is much longer than any typical password. However, if you need to hash very long strings (like tokens or keys), consider using SHA-256 first and then Bcrypt hashing the result — a technique called pre-hashing.