Password Strength Checker

Test how strong a password is.

Password Strength Checker is a free online tool to test how strong a password is. It runs entirely in your browser, so your files never leave your device — nothing is uploaded. There's no sign-up, no watermark, and it works on any modern browser on desktop or mobile.

How to use Password Strength Checker

The Password Strength Checker rates how strong a password is, with an entropy score and an estimated time to crack, plus tips to improve it. The password is analysed entirely in your browser and never sent anywhere. Free and private.

Read the full guide: Password Strength Checker (Free) - Test Your Password

1Type or paste the password.
2See the strength meter and crack-time estimate.
3Follow the tips to make it stronger.

100% private

The password is checked on your device — never uploaded.

Real entropy

Scores by character variety and length, not just rules.

Actionable tips

Clear checklist to strengthen a weak password.

Vet a new password before signing up

Before committing a password to a new bank, email, or work account, paste it here to see its estimated crack time and entropy. The checker flags dictionary words, names, and keyboard runs like 'qwerty' in real time, so you can adjust on the spot and only register once you reach a genuinely hard-to-guess result.

Compare a passphrase against symbol soup

Wondering whether 'correct-horse-battery-staple' really beats 'P@ssw0rd!'? Type both and watch the strength meter react. A good checker rewards length over swapped symbols, so you can prove to yourself that four random words outscore a short cryptic string, then choose the option that is both stronger and far easier to remember.

Re-check an old reused password's strength

If you have leaned on the same login for years, test it here to judge whether it still holds up against modern cracking speeds. The tool estimates how quickly today's hardware could guess it and highlights weak patterns. A short or predictable rating is your cue to retire it and build something tougher before rotating it everywhere.