Bcrypt Generator - Free Online Password Hash Tool

Last updated March 22, 2026

What is a Bcrypt Generator?

A bcrypt generator is a password hashing tool that uses the bcrypt algorithm to create secure, one-way hashes of passwords for safe storage in databases. Bcrypt is a cryptographic hash function specifically designed for password hashing, incorporating a configurable cost factor (work factor) that makes it computationally expensive to crack. Unlike fast hash functions like MD5 or SHA-1 that can be cracked quickly, bcrypt is intentionally slow, taking 100-1000 milliseconds to hash a password, making brute force attacks impractical. Our generator automatically generates random salts (unique random data added to each password before hashing), supports cost factors from 4-12 (higher = more secure but slower), and produces bcrypt hashes in the standard format compatible with all major programming languages and frameworks.

Common Mistakes to Avoid

• Never use MD5 or SHA-1 for passwords — they are too fast and have no salting
• Never store plain text passwords — even temporarily during development
• Do not implement your own salting — bcrypt handles this automatically
• Be aware of bcrypt's 72-character limit — passwords longer than 72 characters are silently truncated
• Use a cost factor of at least 10 in production — lower values are not secure enough
• Increase the cost factor as hardware gets faster — re-hash passwords on next login

All hashing in the tool happens entirely in your browser. No passwords are ever sent to a server, making it safe to test with real or realistic passwords during development.

Why Use Bcrypt for Password Hashing?

Storing passwords in plain text is catastrophically insecure - database breaches expose all user passwords instantly. Even simple hashing (MD5, SHA-1) is insufficient because attackers use rainbow tables and GPU-accelerated cracking to break billions of hashes per second. Bcrypt solves this with adaptive hashing that's slow by design - each hash takes 100-1000ms, limiting attackers to thousands of attempts per second instead of billions. Bcrypt automatically generates unique salts for each password, preventing rainbow table attacks. The configurable cost factor means you can increase security over time as computers get faster. Major frameworks (Django, Laravel, Ruby on Rails, Spring Security) use bcrypt by default. Companies like Facebook, Twitter, and GitHub use bcrypt to protect user passwords.

How to Use

1. Enter the password you want to hash in the input field
2. Select cost factor (10-12 recommended): higher = more secure but slower (10 = ~100ms, 12 = ~400ms)
3. Click 'Generate Hash' to create a bcrypt hash with automatic salt generation
4. Copy the generated hash (60 characters starting with $2a$, $2b$, or $2y$)
5. Store the hash in your database - never store plain text passwords
6. Use bcrypt.compare() in your application to verify passwords against stored hashes

Real-World Examples

Input password:  mySecurePassword123!
Cost factor:     10
Generated hash:  $2b$10$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhWy

Password to verify:  mySecurePassword123!
Stored hash:         $2b$10$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhWy
Result:              ✓ Match

Wrong password:      wrongPassword
Same hash:           $2b$10$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhWy
Result:              ✗ No match

Cost  8:  ~10ms   — Too fast, not recommended for production
Cost 10:  ~100ms  — Good default for most applications
Cost 12:  ~400ms  — Better security, acceptable for login flows
Cost 14:  ~1.6s   — High security, may frustrate users
Cost 16:  ~6.4s   — Very high security, only for critical systems