Bcrypt Hash Verifier

Check if a password matches a Bcrypt hash locally in your browser

🔒 100% Secure: All password verification happens locally in your browser. No data is sent to any server.

Password

Bcrypt Hash

How to Use the Bcrypt Hash Verifier

Verify Password

1Enter the plaintext password
2Paste the Bcrypt hash
3Verification happens automatically
4See match result and hash metadata

Generate Hash

1Switch to Generate Hash tab
2Enter password to hash
3Adjust cost factor (4-14)
4Click Generate Hash
5Copy the generated hash

Key Features

✅

Real-Time Verification

Automatic verification as you type. No button clicks needed

📊

Hash Metadata

Extract version, cost factor, salt, and security level

🔑

Hash Generator

Generate Bcrypt hashes for testing with adjustable cost

📋

Batch Verification

Verify multiple passwords against one hash at once

🛡️

Security Analysis

Analyze hash strength based on cost factor

🌐

100% Client-Side

All processing happens locally. No server requests

What is Bcrypt?

Bcrypt is a password hashing function designed for secure password storage. Unlike fast hashing algorithms like MD5 or SHA-1, Bcrypt is intentionally slow to make brute-force attacks impractical.

Bcrypt incorporates a salt to protect against rainbow table attacks and uses a cost factor that determines how computationally expensive the hash function is. This cost can be increased over time as hardware becomes faster.

Why Use Bcrypt?

•Adaptive: Cost factor can be increased as computers get faster
•Salted: Each hash includes a unique salt to prevent rainbow tables
•Slow by design: Makes brute-force attacks impractical
•Industry standard: Widely used and trusted for password storage

Bcrypt Hash Format Explained

$2b$10$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhWy

$2b$

Algorithm version (2a, 2b, or 2y)

10$

Cost factor (2^10 = 1,024 iterations)

N9qo8uLOickgx2ZMRZoMye

22-character salt (128 bits)

IjZAgcfl7p92ldGxad68LJZdL17lhWy

31-character hash (184 bits)

Cost Factor Guide

Cost	Iterations	Time	Recommendation
4	16	~1ms	Too fast - Not recommended
8	256	~16ms	Minimum acceptable
10	1,024	~64ms	Recommended default
12	4,096	~256ms	Good for sensitive data
14	16,384	~1s	High security

* Times are approximate and vary based on hardware

Common Use Cases

🔧 Development & Testing

Test authentication systems and verify password hashing implementations

🐛 Debugging

Debug login issues by verifying if passwords match stored hashes

📚 Learning

Understand how Bcrypt works and analyze hash structure

🔐 Security Audits

Analyze hash strength and cost factors in existing systems

🧪 Hash Generation

Generate test hashes for development and testing

📊 Batch Testing

Test multiple password candidates against a hash

🛡️ Best Practices

✅ Use Cost Factor 10 or Higher

Cost factor 10 is the recommended minimum for production systems

✅ Prefer Version 2b

Use $2b$ version as it fixes bugs present in $2a$

✅ Increase Cost Over Time

As hardware improves, increase the cost factor to maintain security

✅ Never Store Plaintext Passwords

Always hash passwords before storing them in databases

✅ Use This Tool for Testing Only

This tool is for development and testing. Use server-side verification in production

Frequently Asked Questions

Is this tool secure for production use?

This tool is designed for development and testing. For production systems, always verify passwords on the server-side to prevent exposing hashes to clients.