Bcrypt Generator & Verifier
What is Bcrypt?
Bcrypt is a password-hashing function designed specifically for security. Unlike fast cryptographic hash functions (MD5, SHA-1, SHA-256), bcrypt is intentionally slow and computationally expensive via a configurable cost factor — making brute-force and dictionary attacks impractical. Each bcrypt hash includes a unique random salt embedded in the output, so two identical passwords always produce different hashes. The cost factor (also called rounds) controls the work factor: every increment doubles the computation time. Cost 10 takes ~100ms, cost 12 takes ~400ms, and cost 14 takes ~1.5 seconds on typical hardware. Bcrypt is widely used in web frameworks including Django, Laravel, Rails, Spring Security, and Node.js bcrypt libraries.
How to Use the Bcrypt Generator
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Open the 'Hash' tab, enter the password you want to hash.
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Choose a cost factor — 10 or 11 is recommended for most web apps; use 12 for high-security applications.
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Click 'Generate Hash' — the bcrypt hash string (starting with $2b$) appears and is ready to store in your database.
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To verify a password, switch to the 'Verify' tab.
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Enter the plain-text password and the stored bcrypt hash, then click 'Verify'.
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A green checkmark confirms the password matches; red indicates it does not.
Frequently Asked Questions
What cost factor should I use? For most web applications, a cost factor of 10–12 is a good balance between security and performance. Cost 10 (~100ms) is the minimum recommended. Use 12 (~400ms) for high-value accounts. Avoid going below 10, as it makes brute-force attacks faster.
Why do two hashes of the same password look different? Bcrypt automatically generates a random 22-character salt for each hash and embeds it in the output. This means the same password hashed twice will produce different strings, which is by design — it prevents rainbow table attacks.
What does the bcrypt hash string format mean? A bcrypt hash looks like $2b$12$SaltSaltSaltSaltSaltSaHashHashHashHashHashHashHashHas. The $2b$ is the algorithm version, $12$ is the cost factor, followed by 22 characters of base64-encoded salt and 31 characters of hash.
Can I use this to verify passwords from my database? Yes. Paste the stored bcrypt hash from your database and the plain-text password into the Verify tab. The tool will confirm whether they match, which is useful for debugging login issues during development.
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