Password Strength Checker
Free password strength checker. Test your password's entropy, length, character variety, and common patterns. Get instant feedback and improvement tips.
About the Password Strength Checker
The Password Strength Checker runs entirely in your browser. Your data stays on your device — there's no upload to any server.
Free password strength checker. Test your password's entropy, length, character variety, and common patterns. Get instant feedback and improvement tips. Free, no sign-up, privacy-first.
How to use the Password Strength Checker
Check how strong a password is and get tips for improving it. See estimated crack time and common weaknesses at a glance.
- 1
Enter your password
Type or paste a password into the input field. It's never sent anywhere — checks run in your browser.
- 2
Review the strength rating
See a strength score from weak to strong, plus the estimated time to crack it.
- 3
Check the feedback
Read the tips highlighting missing character types, length issues, or common patterns.
Tips
- •Length matters more than complexity — a 20-character password is stronger than a short one with symbols.
- •Avoid dictionary words, names, and common substitutions like 'p@ssword'.
- •Use a password manager so you only need to remember one strong master password.
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Frequently Asked Questions
Is the password strength checker safe to use?
Yes. All analysis happens in your browser. Your password is never transmitted, stored, or logged on any server.
How is password strength calculated?
We estimate strength based on length, character variety (uppercase, lowercase, numbers, symbols), and common pattern detection. The result shows an estimated time to crack.
Should I enter my real password?
While your password never leaves your browser, we recommend testing a similar password with the same structure rather than your actual password if you're concerned.
What makes a strong password?
Length is the most important factor. Use at least 16 characters with a mix of uppercase, lowercase, numbers, and symbols. Avoid dictionary words and common patterns.