Password Strength Checker — Free Online
Test your password strength online for free. Get instant feedback on length, complexity, patterns, and estimated crack time. 100% private in browser.
About Password Strength Checker
A strong password is your first line of defence against unauthorised access. Our password strength checker analyses your password against multiple security criteria: length, character variety (uppercase, lowercase, numbers, symbols), common patterns, dictionary words, keyboard sequences, and repeated characters. It estimates how long it would take to crack using brute force at modern GPU speeds and gives specific improvement suggestions. Your password never leaves your browser — all analysis happens locally for complete privacy.
Frequently Asked Questions
Is my password sent to your servers?
Absolutely not — the strength analysis runs entirely in your browser. Your password is never transmitted.
What makes a password strong?
At least 12 characters, mixing uppercase, lowercase, numbers, and symbols, avoiding dictionary words.
What is the crack time estimate based on?
The estimate assumes offline brute-force attacks at 10 billion attempts per second.
Can I test multiple passwords?
Yes — clear the input and test as many passwords as you like.
Does it suggest improvements?
Yes — specific suggestions are shown for each weakness detected.