Bcrypt Hash Generator & Verifier
Generate bcrypt password hashes with configurable cost factors, or verify a plaintext string against an existing bcrypt hash. All hashing runs in your browser — your password never leaves your device.
⚠ Cost factor ≥12 can take several seconds in-browser. Proceed anyway?
Cost factor embedded in hash prefix:
Bcrypt Hash Anatomy
Disclaimer: Free tool provided “as is” by MonitorGiant. No warranty or liability for any data loss, security issues, or infrastructure problems arising from use of this tool. Results are for informational purposes only. · A Free Tool by MonitorGiant
What is Bcrypt Hash Generator & Verifier?
Bcrypt is a password-hashing function designed by Niels Provos and David Mazières in 1999. Unlike fast hashing algorithms such as MD5 or SHA-256 — which are optimised for speed — bcrypt is intentionally slow. The cost factor controls how slow: each increment doubles the computation time, so as hardware gets faster you can raise the factor to maintain the same brute-force resistance. Most production systems use a cost factor of 10–12.
How to use this tool
- 1 Choose Hash or Verify mode using the toggle at the top of the tool.
- 2 In Hash mode, enter your password or text, set the cost factor (10 is recommended for most applications), then click Generate Hash.
- 3 Copy the 60-character bcrypt hash — it starts with $2b$cost$ — and store it in your database or test file.
- 4 In Verify mode, paste a stored bcrypt hash and the plaintext to check. The tool runs bcrypt.compare() in-browser and shows a clear match or no-match result.
When would you use this?
- Back-end developers generating test hashes for unit tests or database seeding without spinning up a full application.
- Security engineers verifying that a given plaintext matches a stored hash when auditing a database migration.
- Developers new to bcrypt using the anatomy panel to understand the $2b$cost$salt+hash structure before implementing it in code.
- Debugging login issues — paste the stored hash and the attempted password to confirm the comparison logic.
Need to verify that your login endpoints are properly protected against credential-stuffing attacks? MonitorGiant monitors your authentication endpoints for anomalous traffic patterns.
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How works
- 1
Choose Hash or Verify mode
Use the toggle at the top. "Hash Password" generates a new bcrypt hash from any text input. "Verify Hash" checks whether a plaintext string matches an existing hash.
- 2
Set the cost factor
The slider controls the work factor (4–14). Cost 10 is the industry standard for new systems. Higher values are more secure but take longer — cost 14 can take several seconds in a browser.
- 3
Generate and copy your hash
Click "Generate Hash". The 60-character output starts with $2b$10$ (or whichever cost you selected). Copy it to your clipboard or paste it directly into your database or test file.
- 4
Verify an existing hash
Switch to Verify mode, paste the stored hash and the plaintext you want to check. The tool runs bcrypt.compare() in-browser and shows a clear match or no-match result.
All hashing and verification runs entirely in your browser using the bcryptjs library loaded from a CDN. Your passwords are never sent to any server.
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