Why does the hash change every time I click generate?

Bcrypt automatically generates a random 'salt' every time it hashes a password. This is why you must use a 'verify' function instead of just comparing strings.

Are my passwords sent to your server?

Absolutely not. The bcrypt.js library runs entirely in your browser. Disconnect from the internet and the tool will still work.

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Developer Tools

Bcrypt Hash Generator & Checker

Securely hash passwords or verify existing hashes using the Bcrypt algorithm.

Last updated July 31, 2026

How to use Bcrypt Hash Generator & Checker

1To generate: enter your password, select the number of salt rounds, and click 'Generate'.
2To verify: paste an existing Bcrypt hash (starts with $2a$ or $2b$), enter the plaintext password, and click 'Check Match'.

Why use this tool

100% secure: All hashing and verifying happens locally in your browser.
Adjustable salt rounds (cost factor) from 4 to 16.
Useful for developers testing authentication logic without writing backend scripts.

Use cases

Testing Authentication

Quickly generate a hash to manually insert into your database while testing a new login flow.

Verifying Stored Hashes

Check if a plaintext password matches a specific hash from your database.