Password Strength Checker
Check how strong a password is, how long it might take to crack, and how to improve it — without it ever leaving your browser.
Nothing you type here leaves your browser.
Type a password to check its strength.
This is an estimate based on length, variety and common patterns — it assumes an offline attack at 10 billion guesses per second. Don't test a password you still use on a site you don't trust; use a unique one everywhere.
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How to use this tool
- 1Type or paste a password.
- 2Read its strength, the estimated time to crack and how many bits of entropy it has.
- 3Follow the suggestions to make it stronger.
Features
- Five-level strength meter with an estimated crack time.
- Recognises very common passwords, including “P@ssw0rd”-style substitutions.
- Penalises repeated characters and runs like “abc” or “1234”.
- Specific suggestions for improving the password.
- Show/hide toggle, and autofill and spell-check turned off.
Privacy
The check runs entirely in your browser. Your password is never sent anywhere or stored.
Frequently asked questions
Is it safe to type my password here?
The check runs locally and nothing is transmitted, but as a habit avoid testing a password you use for important accounts — test a similar one instead.
How is the strength calculated?
From the password’s length and the variety of characters it uses, reduced for common passwords, repeats and predictable sequences. It’s an estimate, not a guarantee.
What makes a password strong?
Length above all. A passphrase of four or five unrelated words is easier to remember and harder to crack than a short jumble of symbols.
How is the crack time estimated?
It assumes an attacker with the stolen password hash trying 10 billion guesses per second. Real-world speeds depend on how the site stores passwords.