100% local · no upload

Check password strength

Estimate the entropy of a password and detect common weaknesses — all in your browser.

Password

Enter a password to see its strength.

How it works

Drop your file or paste your content into the tool above.
Adjust the options — every change updates the preview instantly.
Download the result. Your file never leaves your browser.

Your files never leave this page

Every conversion runs entirely in your browser using WebAssembly. There is no upload, no server-side processing, no analytics, and no cookies. Open DevTools → Network during the operation and you will see zero outbound traffic.

Related tools

Generate passwordCreate a strong random password — fully customizable, generated locally with crypto-grade randomness.
Generate passphraseDiceware-style passphrase — random words easy to remember, hard to guess.
Hash textCompute SHA-1, SHA-256, SHA-384, or SHA-512 of any text — output as hex or base64.
bcrypt hash & verifyHash a password with bcrypt (salt + rounds), or verify a password against an existing hash.

Topics covered

password strength
password entropy
password meter
check password strength
is my password strong
free password checker