About Password Strength Checker
Check how strong your password is. See crack time estimates, character analysis, and improvement tips. 100% private — your password never leaves your browser.
How to use
- Type or paste a password into the input field. Analysis happens instantly in your browser.
- The strength meter shows a color-coded bar from red (very weak) to green (very strong).
- See estimated crack time — how long a modern GPU cluster would take to break your password.
- Review the checklist: length, character types, common patterns, and dictionary word detection.
Frequently asked questions
Is this password checker safe to use?
Yes — your password never leaves your browser. All analysis happens locally in JavaScript. No data is sent to any server. You can verify this by checking your browser's network tab.
How is crack time calculated?
We estimate the time based on the password's character set size and length, assuming an attacker with a modern GPU cluster making 10 billion guesses per second. Real-world cracking may be faster for dictionary words or slower for truly random passwords.
What makes a strong password?
Length is the most important factor — 12+ characters significantly increases security. Mixing uppercase, lowercase, numbers, and symbols helps. Avoid dictionary words, names, dates, and common patterns. Consider using a passphrase (multiple random words connected by symbols).
Part of ToolFluency’s library of free online tools for Developer Tools. No account needed, no data leaves your device.