Password Strength Checker
Test your password security instantly in your browser. Our 100% client-side tool analyzes length, entropy, and complexity without ever sending your data to a server.
Why Use Our Password Strength Checker?
We built this tool to provide transparency, privacy, and accurate security estimates for your daily digital life.
100% Client-Side Privacy
Our tool runs entirely within your web browser. Your password is never transmitted over the internet, logged, or saved to any database. Try it offline!
Instant Algorithm Analysis
Get real-time feedback. We calculate character variety, detect predictable keyboard patterns (like "qwerty"), penalize repetitions, and estimate mathematical entropy.
Actionable Feedback
We don't just give you a red or green bar. We provide specific suggestions—like adding length or avoiding dictionary words—to help you improve your security posture.
Security Tips: What Makes a Password Strong?
Creating a strong password isn't just about mashing the keyboard. It requires a balance of length and unpredictability.
- Length is your best friend: A 16-character password of just lowercase letters is often mathematically harder to crack than an 8-character password packed with symbols.
- Avoid the predictable: Attackers use dictionaries. Avoid dictionary words, your pet's name, or sequential keyboard walks like "123456" or "asdfgh".
- Never reuse passwords: A "Very Strong" score is meaningless if you reuse that password on a site that suffers a data breach. Use a unique password for every single account.
- Consider a password manager: The most secure way to handle passwords is to let a password manager generate and store long, random strings for you.
Latest from the Security Blog
Password Length vs Complexity: What Matters More?
An in-depth look at whether you should prioritize a long passphrase or a highly complex, shorter password.
What Is Password Entropy?
A beginner-friendly guide to understanding password entropy and how it mathematically measures resistance to cracking.
How Password Managers Protect Accounts
Learn why security experts universally recommend using a password manager and how it simplifies your online life.
Frequently Asked Questions
Is my password sent to your servers?
No. This tool operates entirely within your browser using client-side JavaScript. No password data is ever transmitted, collected, or logged over the network.
What makes a password strong?
Length is the most critical factor, combined with unpredictability. Avoid dictionary words, sequential numbers, and keyboard patterns.
Ready to check your password?
Use our free, private, browser-based tool to evaluate your password strength immediately.
Go to the Checker Tool