Bcrypt Hash Generator
& Password Verifier

Bcrypt is a password-hashing function designed by Niels Provos and David Mazières in 1999, based on the Blowfish cipher. It incorporates a salt to protect against rainbow-table attacks and is intentionally slow — making brute-force attacks computationally expensive even with modern hardware.

Bcrypt is the industry standard for password hashing because it is adaptive — you can increase the cost factor as hardware becomes faster, ensuring the hash stays difficult to crack. Unlike MD5 or SHA-1 (which are designed for speed), bcrypt is purpose-built for passwords and naturally resists brute-force and rainbow-table attacks.

The cost factor (or work factor) controls how computationally intensive hashing is. A cost of 10 means bcrypt performs 2^10 = 1,024 internal iterations. Higher values are more secure but slower. The default of 10 is a well-balanced choice for most web applications — it takes ~100ms to hash. Each increase by 1 doubles the hashing time.

No. Bcrypt is a one-way hashing algorithm — not encryption. Once hashed, there is no mathematical way to reverse it back to the original password. Verification works by hashing the candidate password with the same salt and comparing the result to the stored hash.

Yes. Bcrypt with a sufficient cost factor remains a strong, widely-recommended choice for password hashing. Modern alternatives like Argon2id (winner of the Password Hashing Competition) and scrypt also exist and offer memory-hard properties. However, bcrypt at cost 12+ is still considered very secure and is actively used in millions of production systems.

A bcrypt hash looks like: $2a$10$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhWy It contains: the algorithm version ($2a$), the cost factor (10), a 22-character base64-encoded salt, and a 31-character hash output — always 60 characters total.