Bcrypt Hash Generator

Generate secure bcrypt password hashes
This free online bcrypt hash generator runs in your browser and is part of our Cryptography collection.

🔒 Bcrypt Hash Generator

Generate secure bcrypt password hashes for safe password storage

10 Higher = More secure but slower
Recommended: 10-12 for production systems

About Bcrypt:

  • Security: Industry-standard password hashing algorithm
  • Salt: Automatically generates and includes unique salt
  • Cost Factor: Higher values increase computation time (protection against brute force)
  • Adaptive: Can increase cost over time as hardware improves
  • One-Way: Cannot be reversed - only passwords can be verified

⚠️ Important Notes:

  • Browser Implementation: This uses a JavaScript bcrypt library (slower than server-side)
  • Production: Use server-side bcrypt in production for better performance
  • Storage: Store the complete hash string (includes salt and cost factor)
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Instant In-Browser Execution Runs locally in JavaScript without wait times or server delays.
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100% Privacy & Security Your inputs and files are never stored or logged on remote servers.
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Cross-Device Responsive Fully optimized for mobile smartphones, tablets, and desktop displays.
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100% Free Forever No subscription fees, no signups, and no software installations.

How to Use the Online Bcrypt Hash Generator

1 Enter Plaintext Password

Type the password or passphrase you want to hash or verify.

2 Select Work Factor (Cost Rounds)

Choose the computational cost factor (rounds 10 to 14, default 10) to control hashing time and brute-force resistance.

3 Generate Bcrypt Hash

Click "Generate Hash" to generate a cryptographically salted `$2a$` or `$2b$` Modular Crypt Format string.

4 Verify Against Existing Hash

Paste an existing Bcrypt hash string into the verification field to test whether a password matches without exposing secrets.

Frequently Asked Questions

Common questions about using this free online bcrypt hash generator.

What is the Bcrypt Cost Factor? ▾
The cost factor (e.g. 10) determines the number of key expansion rounds as 2^cost (2^10 = 1,024 iterations). Increasing the cost factor exponentially increases the computation time required to crack the hash via GPU brute-force attacks.
Why does hashing the same password twice generate different Bcrypt strings? ▾
Bcrypt automatically generates a unique, cryptographically random 128-bit salt for every single hash operation. Even identical passwords will always produce completely different Bcrypt strings, neutralizing rainbow table attacks.
What is the 72-byte password limit in Bcrypt? ▾
The underlying Blowfish cipher in Bcrypt natively truncates inputs longer than 72 bytes. For passwords exceeding 72 characters, best practice is to pre-hash the input with SHA-256 before feeding into Bcrypt.
What do the prefix characters `$2a$` and `$2b$` mean? ▾
They indicate the specific Bcrypt implementation specification. `$2b$` is the latest standard (introduced in OpenBSD) fixing previous wrap-around length handling.

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