Home › Utility & Security Tools › Bcrypt Hash Generator
Generate bcrypt password hashes with configurable work factor — and verify that a plaintext password matches an existing bcrypt hash.
Generate and verify bcrypt hashes in browser · cost factor 10-14 · automatic salt · client-side only
Type or paste the password you want to hash.
Choose a cost factor between 10 and 14. Higher cost means slower hashing — more resistance to brute-force attacks.
Click Hash to generate a bcrypt hash, or paste an existing hash and click Verify to check whether a password matches it.
MD5 and SHA-256 are fast hash functions — designed to hash data quickly. Fast hashing is bad for passwords because an attacker with a GPU can check billions of guesses per second. Bcrypt is intentionally slow — its cost factor controls how many rounds of hashing are performed, making each guess take significantly longer. A cost factor of 12 means 2^12 (4,096) rounds — this makes brute-force attacks orders of magnitude more expensive.
The OWASP recommendation (as of recent guidance) is a minimum cost factor of 10, with 12 preferred for new applications. The right factor is the highest value that still produces an acceptable response time for your server — typically targeting 100ms–250ms per hash. Higher factors are more secure but slower. Adjust as your server hardware improves over time.
Bcrypt automatically generates a random salt and embeds it in the hash output. The salt ensures that hashing “password123” produces a different hash each time, preventing rainbow table attacks where an attacker precomputes hashes for common passwords. The verify function extracts the embedded salt from the stored hash before comparison — you don’t need to manage the salt separately.
No. Bcrypt hashing and verification run in your browser. Your plaintext password never leaves your device.
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Bcrypt is the recommended algorithm for password hashing in most modern web applications — it’s supported natively in Node.js, PHP, Python, Ruby, Go, and virtually every other backend language. This generator lets you produce bcrypt hashes with a configurable cost factor for testing your implementation, verifying that your application’s hash output matches a known-good value, and checking whether a given password matches a stored hash. The verify function mirrors exactly what your application’s bcrypt.compare() call does, making this a useful reference tool during authentication development.
All hashing and verification runs in your browser. Passwords are never transmitted to or stored on any server.
