What is Bcrypt Hash Generator?
Bcrypt is a password-hashing function designed by Niels Provos and David Mazières, based on the Blowfish cipher. It is specifically designed to be slow and computationally expensive, which makes it resistant to brute-force and rainbow table attacks. Unlike fast hashing algorithms like MD5 or SHA-256, Bcrypt incorporates a salt to protect against rainbow table attacks and an adjustable work factor (cost) that allows the algorithm to remain secure as computing power increases. This tool allows you to generate Bcrypt hashes for any password string and verify if a plain text password matches a given hash. It is an essential tool for developers implementing secure authentication systems.
Input Formats
- Plain text password
- Salt rounds (cost factor)
- Bcrypt hash string (for verification)
Output Results
- Bcrypt hash string (e.g., $2a$10$...)
- Verification result (Match/No Match)
- Generation time
Key Features
Who is this for?
User Authentication
Developers generating test hashes for seeding user databases with dummy passwords.
Security Auditing
Security researchers verifying if a leaked hash matches a known password list.
Learning Cryptography
Students experimenting with cost factors to understand the time-memory trade-off in password hashing.
How to Use
Enter a password in the input field.
Select the 'Salt Rounds' (default is 10). Higher means slower/more secure.
Click 'Generate Hash'.
To Verify: Switch to 'Verify' tab, enter the password and the hash to check.
Examples
Input
mypassword123Output
$2a$10$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhWyCommon Errors
- Using too high cost factor (freezes browser)
- Truncated hashes (must be 60 chars)
- Confusing Bcrypt with MD5/SHA
Code Examples
Node.js (bcryptjs)
const bcrypt = require('bcryptjs');
const salt = bcrypt.genSaltSync(10);
const hash = bcrypt.hashSync('password', salt);
// Check password
const match = bcrypt.compareSync('password', hash);Python (bcrypt)
import bcrypt
password = b'super secret password'
hashed = bcrypt.hashpw(password, bcrypt.gensalt())
if bcrypt.checkpw(password, hashed):
print('It matches!')