Strength is measured by entropy — calculated from length and character set size. Longer passwords with varied characters have higher entropy and are harder to crack.
What is considered a strong password?
At least 12 characters with uppercase, lowercase, numbers and symbols, no dictionary words, unique per account.
Does this tool store my password?
No — password analysis runs entirely in your browser. Your password is never sent to our servers.
Is my password sent to your server?
No. All analysis happens entirely in your browser using JavaScript. Your password is never transmitted over the network. You can even disconnect from the internet and the checker will still work.
What makes a password strong?
Length is the most important factor. A 16-character random password is exponentially stronger than an 8-character one. Using all character types (uppercase, lowercase, numbers, symbols) and avoiding dictionary words, repeated characters, and sequential patterns all increase strength.
What is password entropy?
Entropy measures password unpredictability in bits. Each additional bit doubles the number of possible passwords. A password with 60+ bits of entropy is considered strong. 80+ bits is very strong. Our generator creates passwords with 100+ bits of entropy.
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Strong passwords are only one layer of security.Add VPN protection as another layer — tested and recommended by Anonymiz.
Password crackers do not guess at random. They try leaked passwords first, then dictionary words, names and dates with common substitutions such as @ for a and 0 for o, then keyboard patterns like qwerty123. A password is strong when none of those shortcuts can reach it, and length is what makes that hardest.
Length beats complexity
A random 16-character password, or a passphrase of four or five unrelated words, is far harder to crack than an 8-character password full of symbols. Current NIST guidance favours longer passwords and drops forced symbol rules and routine forced changes, because those push people towards predictable patterns like Summer2024!.
How to read a strength score
Crack-time estimates assume the worst case: an attacker with a stolen copy of a poorly protected database. Guessing through a website's login page, which limits attempts, is far slower.
A leaked password is weak whatever its score, because attackers try known leaked passwords first.
Reuse is the biggest risk. One breached site exposes every account that shares the same password.
Practical advice
Use a password manager to create and remember a unique password for every account. The password generator creates random ones.
Turn on two-factor authentication for email, banking and anything that can reset your other accounts.
Test a similar pattern, not the real thing. Never type a password you actually use into a website you do not fully trust.