Type password
Type the password you want to test into the box.
WEBSITE SECURITY TOOLS · FREE ONLINE TOOL
Password Strength Checker
Real entropy analysis with pattern detection, crack-time estimate and fixesPassword123! looks strong to a human and falls to an attacker in seconds. Type any password to get an instant verdict: a strength score, estimated crack time, and the specific weaknesses found.
// PASSWORD STRENGTH CHECKER · GET STARTED
Use Password Strength Checker
Real entropy analysis with pattern detection, crack-time estimate and fixes
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Checked entirely in your browser. Nothing is sent anywhere.
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How to use the Password Strength Checker
Read the score
Watch the live score, entropy, and crack-time estimate update as you type.
Fix weaknesses
Fix the flagged patterns using the suggestions list.
// PASSWORD STRENGTH CHECKER · ABOUT THIS TOOL
About the Password Strength Checker
Most password meters just count character types, which is why "Password1!" scores well yet falls in seconds. This checker measures entropy from the actual character pool and hunts for the patterns guessing engines try first.
The result is a 0 to 4 score, an entropy figure and an honest crack-time estimate, all computed locally. Nothing is uploaded, logged or stored.
Where it helps most
Reality checks for passwords that feel stronger than they are.
Before committing
Test a new password the way an attacker would, before you start using it anywhere.
Auditing old passwords
Run a quick pass over existing passwords you suspect are weaker than they feel.
Teaching good habits
Show teams and family why complexity theater fails and what actually resists guessing.
Checking passphrases
Verify that a memorable passphrase actually carries the entropy you expect before adopting it.
Reading your score
What the verdict actually measures.
Attack methods, not looks
Scores reflect dictionary attacks, pattern matching, keyboard walks, and brute force, not on-screen complexity.
Patterns get caught
l33t substitutions, qwerty sequences, dates, and word-plus-123-plus-! are all recognized instantly.
Length wins
A long random passphrase beats short complex-looking passwords every single time.
Breaches beat scores
No score saves a password already leaked in a data breach, so pair this with a breach lookup.
Password Strength Checker: private by design
Everything is evaluated in your browser and nothing is transmitted anywhere. As a rule, never paste a live password into any site you do not fully trust.
Password Strength Checker FAQs
By entropy and guessability: length, character variety, and resistance to dictionary attacks, pattern matching, and brute force. A long random passphrase beats a short complex-looking password every single time.
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