Password Strength Tester
Check how strong, secure, and hard to crack your password is. The analysis runs locally in your browser and nothing you type is sent to our server.
Crack time is a rough offline-attack estimate, not a guarantee.
How to check password strength
A password strength tester estimates how difficult a password may be to guess. Length, character variety, repeated patterns, common words, sequences, and other predictable structures all affect the result. Longer unique passwords usually provide a much larger search space than short passwords with forced substitutions.
StrongPassworder performs this check entirely in your browser. Your password is not submitted to the website, stored in logs, or sent to an external API. The score is practical guidance rather than a promise that a password cannot be compromised.
What makes a password strong?
Prioritize length and uniqueness. Avoid reusing passwords, personal information, years, common phrases, keyboard walks, and simple variants such as replacing letters with obvious symbols. For passwords you do not need to memorize, a random generator is usually the simplest option.
Need a stronger password?
Create a cryptographically random password in one click.
Password strength FAQ
How strong is my password?+
Enter it in the tester above. The tool evaluates length, estimated entropy, character variety, common-password patterns, repetitions, and sequences, then returns a strength score and a rough crack-time estimate.
Is it safe to type my password here?+
The test runs locally in your browser. The password field is not submitted to our server or an external service. For highly sensitive credentials, you can also test a password with a similar structure instead of the exact password.
How long should a strong password be?+
As a practical baseline, longer is better. For an important login, aim for at least 15 characters when the service allows it, and use a unique password for every account.
What does estimated crack time mean?+
It is a mathematical approximation based on an assumed attack rate and estimated search space. Real attacks vary because attackers use dictionaries, leaked passwords, rules, hardware, and information about the target.