How the bcrypt Generator Works

What the Tool Does

This bcrypt generator creates secure password hashes using the bcrypt algorithm with a configurable cost factor (rounds). It can generate a bcrypt hash, verify a password against an existing hash, and parse a bcrypt string to show its version, cost, and salt. Everything runs locally in your browser via bcryptjs, so your password never leaves your device.

Common Developer Use Cases

Use an online bcrypt generator when testing signup and login flows, validating a bcrypt hash from a database export, or comparing hashes during migrations. It is also useful for debugging cost factor settings, checking whether a bcrypt compare call succeeds, and quickly generating example bcrypt hashes for docs or unit tests.

Hash Format, Cost Factor, and Parsing

A bcrypt hash looks like $2b$12$... and contains the algorithm version, a two-digit cost factor, a 22-character salt, and a 31-character hash. Higher cost factors take exponentially more time. This tool parses the hash to show the version, cost, salt, and hash components so you can verify settings and diagnose mismatches.

Common Pitfalls and Edge Cases

Bcrypt is one-way: there is no bcrypt decrypt operation. If verification fails, check for whitespace differences, incorrect encoding, or a mismatched cost factor. Very high cost factors can be slow in the browser, while low cost factors are weaker and not recommended for production. Timing varies by device, so always benchmark on your target environment.

When to Use This Tool vs Code

Use this bcrypt hash generator for quick checks, debugging, or confirming a bcrypt compare result. For production systems, always hash and verify passwords in your backend using your platform’s bcrypt library, store only the hash, and use constant-time comparisons. This tool is best for development and troubleshooting.