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Security

Bcrypt Generator

The Bcrypt Generator hashes a password with a random per-hash salt and a configurable cost factor, and verifies a password against an existing hash. It runs bcryptjs entirely in your browser, so nothing you type is transmitted or stored.

Last updated · Free, no signup

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How does bcrypt password hashing work?

Bcrypt is a password-hashing function that combines a password with a random salt and repeats an expensive key setup according to a configurable cost. The resulting 60-character string stores the algorithm version, cost, salt, and hash so a later password can be checked without recovering the original.

This page uses bcryptjs locally and supports cost factors 4 through 12 for interactive use. Raising the cost roughly doubles the work at each step, which slows both legitimate verification and guessing attacks. Generate a fresh hash for every password and never treat bcrypt output as reversible encryption.