Password Strength Checker
100% client-side — your password is analyzed with the zxcvbn library in your browser and never transmitted.
Why it's weak
Suggestions
Check a password's real-world strength using pattern-based analysis (not raw entropy) — see exactly why it's weak and what to change, entirely in your browser.
How it works
- Type a password to check
- See a strength score and an estimated offline crack time, based on real cracking patterns rather than a raw entropy count
- Read the specific reasons it's weak (dictionary words, sequences, keyboard patterns) and suggestions to improve it
Frequently asked questions
Is my password sent to a server?
No — analysis runs through the zxcvbn library entirely in your browser. Nothing is ever transmitted.
Does a high score guarantee a safe password?
It's a strong estimate based on real-world cracking patterns, not a guarantee. Academic research has found that password strength meters across major providers are often inconsistent — treat this as guidance, not certainty.
Why does it say my password is weak?
The tool lists specific detected issues — like a dictionary word, a sequential pattern, or a keyboard walk — instead of just showing a bare score.
Related tools
From the blog
Passkeys Just Passed 5 Billion — But Most Accounts Still Run on Passwords
Passkey sign-ins now succeed 93% of the time versus 63% for passwords, and global adoption has crossed 5 billion. But 87% of organizations still use passwords for customer logins — here's why passwords aren't going away yet, and how to make the ones you still use stronger.
2026-09-04 A Concordia University study found major password meters give "blatantly misleading" scores. We tested "password123456" to see why.
Academic research has found that entropy-based password meters create a false sense of safety — a long password can score well while still being trivially guessable. We fed "password123456" (14 characters) into our own tool and it correctly called it weak, in two seconds, and said exactly why.
2026-08-29Update history
- 2026-08-30 Added: a cover image — used as the card thumbnail, social share image, and blog title image.
- 2026-08-29 Launched: live password strength analysis via zxcvbn (pattern-based, not raw entropy), explains specific detected weaknesses (dictionary words, sequences, keyboard patterns), 100% client-side.