Example
Fair–Strong
Password Strength Checker
Check how strong your password is instantly in your browser. Free online password strength checker with entropy, length, and character analysis — nothing is uploaded.
Enter the values below, then press Calculate (or press Enter). The calculator updates your results instantly. Try different values to see how your inputs change the outcome.
- Password to check — enter a text value. A typical Password to check would be Type a password to analyze….
- Review your results — the key output is highlighted, with supporting figures below.
Loading calculator…
Results
Strength
| Detail | Value |
|---|---|
| Score | |
| Entropy (bits) | |
| Length | |
| Criteria |
What is this calculator for?
Evaluate a password on length, character variety, and entropy so you can judge and improve its strength.
How to Use This Calculator
Enter the values below, then press Calculate (or press Enter). The calculator updates your results instantly. Try different values to see how your inputs change the outcome.
- Password to check — enter a text value. A typical Password to check would be Type a password to analyze….
- Review your results — the key output is highlighted, with supporting figures below.
What You'll Need
- Password to check
- a text value · required
About This Calculator
This password strength checker grades a password on five criteria: length, mixed case, numbers, and symbols, plus an estimated entropy in bits.
Entropy is a measure of unpredictability — the higher the bits, the harder the password is to guess or brute-force. Longer, diverse passwords win. The tool lists which criteria you have met and which are missing so you can strengthen it.
Crucially, analysis runs entirely in your browser. Your password never leaves your device.
Worked Examples
Frequently Asked Questions
Is my password safe to type here?
Yes — the strength check is performed locally via JavaScript. Nothing is transmitted, stored, or logged.
What makes a strong password?
Length is the most important factor. Aim for 12+ characters mixing upper/lowercase, numbers, and symbols, or use a long passphrase.