Bcrypt Generator

Free online Bcrypt hash generator and password verifier. Generate secure bcrypt hashes with adjustable cost factor (4-16 rounds). Verify passwords against bcrypt hashes. 100% client-side processing, your data never leaves your browser.

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Bcrypt is an industry-standard password hashing algorithm designed by Niels Provos and David Mazières. Unlike simple hash functions like MD5 or SHA, bcrypt is specifically designed for password hashing with built-in salt generation and adaptive cost factor. This tool allows you to generate secure bcrypt hashes and verify passwords against existing hashes, all processed locally in your browser for maximum security. The adaptive cost factor means bcrypt can be configured to remain resistant to brute-force attacks even as computing power increases over time.
  1. Enter your password in the input field
  2. Adjust the cost factor using the slider (12 is recommended for production)
  3. Click 'Generate Hash' to create a bcrypt hash
  4. Copy the generated hash for storage in your database
  5. Use the Verify tab to check if a password matches a hash

What cost factor should I use?

For production systems, a cost factor of 12 is recommended as a good balance between security and performance. Higher values (14-16) provide stronger security but take longer to compute. For testing purposes, 4-8 is sufficient.

Is bcrypt better than MD5 or SHA?

Yes, bcrypt is specifically designed for password hashing. Unlike MD5 or SHA which are fast general-purpose hash functions, bcrypt is intentionally slow and includes built-in salt, making it much more resistant to brute-force and rainbow table attacks.

Is my password safe using this tool?

Yes, all processing happens entirely in your browser using JavaScript. Your password is never sent to any server. The bcrypt hash is generated locally and only you have access to it.

What do the numbers in the hash mean?

A bcrypt hash like $2a$12$... contains: the algorithm version (2a), the cost factor (12), and a 22-character salt followed by a 31-character hash. Our tool breaks down this structure for you.

Can bcrypt hashes be decrypted?

No, bcrypt is a one-way hash function. It's mathematically impossible to reverse a bcrypt hash back to the original password. The only way to verify is to hash the candidate password and compare the results.

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