Password
Strength Tester
Instantly analyze how secure your password really is — with real-time feedback, crack-time estimation, and expert improvement tips.
Password Strength Tool
💡 Improvement Tips
Your password never leaves your device. All analysis runs locally in your browser.
How It Works
Our tool evaluates your password across multiple dimensions to give you an accurate security score.
Entropy Analysis
We calculate password entropy in bits — the mathematical measure of unpredictability that determines how difficult a password is to crack.
Crack Time Estimation
Based on modern GPU brute-force speeds, we estimate how long it would realistically take an attacker to crack your password.
Pattern Detection
We check against common password patterns, dictionary words, and known breached passwords so you know if your choice is already compromised.
Actionable Feedback
Beyond a score, we give you specific, practical tips to improve your password so you leave with something genuinely secure.
Frequently Asked Questions
Is it safe to type my real password here?
Absolutely. This tool is 100% client-side — your password is analyzed entirely within your browser and is never transmitted to any server. Check your browser's network tab to verify: zero requests are made when you type.
What makes a password truly strong?
A strong password is long (12+ characters), mixes character types (uppercase, lowercase, numbers, symbols), avoids common words and predictable patterns, and is unique — not reused across sites. Read our full guide →
How is crack time calculated?
We model brute-force attacks using modern GPU speeds (~10 billion guesses/second for MD5 hashes). The estimated crack time assumes the attacker is trying every possible combination — the most conservative scenario.
What's entropy and why does it matter?
Entropy measures the randomness of your password in bits. Higher entropy means more possible combinations an attacker must try. A password with 60+ bits of entropy is considered very strong by current standards.
Should I use a password manager?
Yes — password managers are one of the most effective ways to maintain strong, unique passwords across all your accounts without needing to memorize them. Tools like Bitwarden, 1Password, or KeePass are excellent options.
How to Create a Strong Password (That You Can Actually Remember)
Learn the proven techniques security experts use to create passwords that are both uncrackable and memorable — no post-it notes required.
Read the Guide →