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Bcrypt Checker

Hash passwords with bcrypt and verify hashes

Bcrypt is a slow, adaptive password hashing algorithm with built-in salt. Note: Bcrypt requires Web Crypto which doesn't support bcrypt directly, so we use PBKDF2 with similar strength characteristics.

Generated Hash:

Uses PBKDF2-SHA512 with 200,000 iterations (comparable to bcrypt cost 12).

What is Bcrypt Checker?

Bcrypt Checker is a free online tool that helps you hash passwords with bcrypt and verify hashes. It runs entirely in your browser using client-side JavaScript, so your data stays private and never leaves your device.

When to Use

  • Generating secure credentials, keys, or hashes for your applications
  • Checking or verifying security configurations and encryption settings
  • Learning about cryptographic concepts and security best practices

How to Use

Enter your input in the field above, adjust any settings if available, and click the action button. Results appear instantly—no page reload, no server wait. All processing happens locally in your browser.

Related Tools

Try our Password Generator for related functionality.

Deep Dive: How Bcrypt Checker Works

Bcrypt Checker is a security-focused tool that helps protect digital assets and sensitive information through proven cryptographic principles and security best practices. In today's threat landscape where data breaches and credential theft are commonplace, understanding and properly implementing security measures is no longer optional—it's a fundamental requirement for any application handling user data. Bcrypt Checker operates entirely client-side using your browser's JavaScript engine, meaning sensitive inputs like passwords, secrets, or personal data never traverse the network or touch a remote server. This zero-trust, local-only architecture ensures your confidential information remains completely private and under your control at all times. Security tools like this empower developers, system administrators, and everyday users to implement industry-standard protection without deep cryptographic expertise or expensive infrastructure. Whether you're generating secure credentials, validating security configurations, or testing system hardening, having these capabilities instantly available in your browser dramatically lowers the barrier to good security practices.

Pro Tips

  • Store hashes, not passwords—if your database is compromised, hashed passwords limit the damage
  • Regularly audit your security configurations using checker tools to catch misconfigurations early
  • Understand what entropy actually measures—high entropy means unpredictable, not necessarily strong

Common Mistakes to Avoid

  • Using MD5 or SHA-1 for password storage—these are trivially crackable with modern hardware
  • Trusting client-side entropy calculations as definitive—true randomness requires hardware sources

Frequently Asked Questions

How do I hash a password with bcrypt and verify it matches?
Enter a password and the bcrypt checker generates a salted hash like '$2b$12$...'. To verify, paste the hash and re-enter the password—it confirms if they match. Bcrypt automatically generates a unique random salt for each hash and applies multiple rounds of hashing, making it resistant to rainbow table and brute-force attacks.
What do the bcrypt cost factor and salt rounds mean?
The cost factor (e.g., 12 in $2b$12$) defines the number of hashing rounds as 2^cost—cost 12 means 4,096 iterations. Higher costs slow down hashing, making brute-force attacks exponentially harder. A cost of 10-12 is typical. The salt is a random value prepended to prevent identical passwords from producing identical hashes.
Why should I use bcrypt instead of MD5 or SHA256 for password storage?
MD5 and SHA256 are designed for speed, making them vulnerable to GPU-accelerated brute-force attacks (billions of guesses per second). Bcrypt is intentionally slow and computationally expensive—each guess takes significantly longer, and you can increase the cost factor over time as hardware improves. This makes password cracking impractical.