Password Strength Checker
Free online password strength checker. Estimate crack time, entropy and composition in real time — 100% local, your password never leaves the browser.
💡 Checking runs entirely in your browser — the password is never uploaded. For safety, avoid entering passwords you actively use
💡 Strong password tips: 12+ chars, mix upper/lowercase, digits and symbols; avoid birthdays, names and common words
💡 Generate a strong password with our Password Generator first, then verify its strength here
FAQ
Is my password uploaded when I check it?
Never. Strength is computed entirely in your browser and the password never leaves your device. As a rule of thumb, avoid typing your real passwords into any web page anyway.
How is strength calculated?
A weighted score based on length, character classes (upper/lower/digits/symbols), common weak-password phrases, repeats and sequences. 0-100 maps to four levels from very weak to very strong.
Are the crack-time estimates accurate?
They assume an offline attack (the attacker has your hash and brute-forces with GPUs). Real-world risk also depends on salted slow hashes and 2FA. Treat the numbers as orders of magnitude, not exact values.