What is Password Strength Tester?
The password strength tester is a free online security tool that evaluates password strength in real time — strength level (weak/fair/good/strong), information entropy, estimated online and offline brute-force crack times — and provides suggestions about length, uppercase, numbers, symbols and common passwords. Great for account security audits, developer testing and security education. Everything runs locally in your browser; your password never leaves your device.
▶Use Cases5 scenarios
- ◆Account security audits
- ◆Password security education
- ◆Developer testing
- ◆Security training
- ◆Choosing safe passwords
▶How to Use4 steps
- 1Type the password to test
- 2See the strength score instantly
- 3Check entropy and crack time
- 4Follow the suggestions to improve
▶Features6 features
- ✓Real-time scoring
- ✓Entropy calculation
- ✓Crack time estimates
- ✓Actionable suggestions
- ✓Show/hide password
- ✓Browser-based
▶FAQ7 questions
What is the Password Strength Tester?
An online security tool. Input: any password. Output: a strength level (weak/fair/good/strong), information entropy, estimated online and offline crack times, and improvement tips. All analysis runs locally — the password never leaves your device. Use it for account hygiene and security education.
What makes a strong password?
Generally: at least 12 characters with upper and lower case letters, numbers and symbols — while avoiding common words, birthdays and sequential characters. Higher entropy means harder to brute-force.
Are the crack time estimates accurate?
They are theoretical estimates based on entropy and assumed attack speeds (about 1,000 guesses/sec online, 10 billion/sec offline). Real time depends on the attacker's hardware and method.
Is my password uploaded anywhere?
Absolutely not. All analysis happens locally in your browser and the password is never sent to any server.
What does entropy mean?
Entropy measures how random and unpredictable a password is, in bits. Every extra bit of entropy doubles the difficulty of cracking it.
What are common weak passwords?
Examples: 123456, password, qwerty, 111111, iloveyou. The tool flags these against a common password dictionary.
Is this tool good for teaching?
Yes — it makes the factors behind password strength visible and is a great aid for security education.