bcrypt Hash Generator Online: Quick & Free Tool

An online bcrypt generator lets you hash a password or string using the bcrypt algorithm directly in your browser — no command line, no library installation, no code required. This is useful for generating test hash values to compare against your application's output, experimenting with different cost factors, or quickly verifying that a stored hash corresponds to a given password.

How to Use the Online bcrypt Generator

1. Enter the password — Type or paste the plaintext password you want to hash into the input field.
2. Choose the cost factor — Select a rounds value. The default is 10; for production use, 12 is recommended on modern hardware.
3. Click Generate — The tool produces a bcrypt hash string in the format $2b$12$....
4. Optionally verify — Enter a plaintext password and an existing bcrypt hash to confirm they match — useful when debugging login issues.

Understanding the bcrypt Hash Format

$2b$12$saltsaltsaltsaltsaltsa.hashhashhashhashhashhashhashha

$2b   = bcrypt version identifier
12    = cost factor (2^12 iterations = 4096 rounds)
next 22 chars = base64-encoded salt (random)
final 31 chars = base64-encoded hash

Why Use an Online bcrypt Generator?

• Test your application logic — Generate a known hash, then pass it through your app's password_verify() or bcrypt.compare() to confirm the verification path works.
• Seed database fixtures — Development databases often need pre-hashed test passwords. Generate them here and paste into your seed files.
• Debug login failures — If a user cannot log in, generate a hash from their reset password and compare with what is stored to identify discrepancies.
• Benchmark cost factors — Observe how much longer higher cost factors take to generate — this directly translates to attack resistance.

bcrypt Is Intentionally Slow

Unlike MD5 or SHA-256 which complete in microseconds, bcrypt at cost factor 12 takes 200–400ms. This is by design. A single modern GPU can compute billions of MD5 hashes per second. The same GPU can attempt only a few thousand bcrypt hashes per second at cost 12. This asymmetry is what makes bcrypt effective for password storage: attackers cannot feasibly brute-force a properly hashed bcrypt password.

bcrypt Limitations to Know

bcrypt truncates passwords at 72 bytes. If you support very long passphrases, consider a prehash strategy (SHA-256 the password before passing to bcrypt). Also, bcrypt does not natively support Argon2 or scrypt work factors. For new applications on PHP 7.3+ or Python, consider Argon2id as it is more memory-hard and resistant to GPU attacks. For existing applications using bcrypt, it remains a solid and proven choice.

Try it now with the bcrypt Generator — generate hashes, verify passwords, and experiment with cost factors in seconds.