100% free · Runs 100% in your browser · No signup needed
The Password Strength Checker analyzes how resistant your password is to guessing attacks. It measures entropy (the true mathematical unpredictability), estimates how long brute-forcing would take, detects commonly used passwords, and gives specific suggestions to make weak passwords stronger. Unlike simple must contain a symbol rules, it tells you what actually matters.
How to use: 1) Type a password into the field (use the Show toggle if you want to see it). 2) Watch the strength bar, score, entropy bits and estimated crack time update live. 3) Follow the personalized suggestions to strengthen weak passwords. Your input is never sent anywhere - the analysis runs entirely in your browser.
Why use it: Most password advice is folklore - add a symbol and a number creates passwords like P@ssw0rd1 that attackers crack in seconds because they are on every wordlist. Real strength comes from length and unpredictability. This tool shows you the actual entropy math and honest crack-time estimates, so you learn what makes passwords strong instead of following rituals that do not help.
Key benefits: Real entropy calculation based on character pool and length - not guesswork. Honest crack-time estimates at a realistic 10 billion guesses per second. Detection of the most commonly breached passwords with an instant very weak verdict. Actionable, specific suggestions instead of generic advice. Absolute privacy - the tool prominently guarantees your password never leaves the page, which is essential for a tool of this kind.
FAQs: Is it safe to type my real password here? Yes - unlike many checkers, this one performs zero network requests with your input; everything is computed locally. What is entropy? Bits of unpredictability - 70+ bits means effectively uncrackable by brute force. Why is my 8-character complex password weak? Length dominates: 8 characters simply do not contain enough combinations regardless of symbols. What is the single best improvement? Make it longer - each extra character multiplies cracking time.
Pro tips: Test a few variations of your password idea to learn which changes actually add entropy - you will quickly see that length beats complexity. Run this check before committing to a new master password for your password manager. If any password scores below Strong, generate a replacement with a proper generator rather than tweaking it by hand. FistHost offers a free secure password generator as the perfect companion to this checker.
Related tools: Replace weak passwords using the Password Generator, which shows entropy as it creates secure secrets. Both FistHost security tools are 100% client-side and free forever.
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