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How to Hash and Verify Passwords with Bcrypt
The Bcrypt tool hashes passwords with a configurable cost factor and verifies existing bcrypt hashes — all in your browser using bcryptjs.
- Enter a password and select a cost factor (10–12 recommended).
- Click Hash to generate the bcrypt hash string.
- To verify, paste an existing hash and a password — the tool tells you if they match.
Why Bcrypt for Passwords?
Bcrypt is a password hashing function designed to be intentionally slow, making brute-force attacks impractical. The cost factor (work factor) controls how many iterations are performed — each increment doubles the computation time. Unlike SHA-256, bcrypt automatically generates and embeds a random salt, preventing rainbow table attacks. It is the gold standard for password storage.
Why Use Our Bcrypt Tool?
- Hash and verify — both operations in one interface.
- Adjustable cost factor — choose the right balance of security and speed.
- Browser-based — uses bcryptjs, so your password never leaves the browser.
- Educational — see the salt and cost factor embedded in the hash string.
Frequently Asked Questions
What cost factor should I use?
10–12 is the typical recommendation. Each increment doubles the time. For high-security applications, use 12 or higher. Test the hash time on your target hardware.
Is bcrypt better than SHA-256 for passwords?
Yes. SHA-256 is fast, which makes brute-force attacks feasible. Bcrypt is intentionally slow and includes automatic salting, making it far more resistant to attacks.
Can I use the generated hash in my application?
Yes. The output is a standard bcrypt hash string that works with bcrypt libraries in Node.js, Python, PHP, Ruby, and Go.
Is my password safe?
Yes. Hashing runs in your browser using bcryptjs. Your password is never sent to any server.