Password Strength
Check how strong your password is instantly. Get a detailed security score, entropy estimate, and specific tips to improve it.
Your password is never sent to any server.
About Password Strength
Test the strength of any password with a detailed analysis. See your password rated from Very Weak to Strong, check which security criteria it meets, and get an entropy estimate in bits. Your password is analyzed entirely in your browser and never sent to any server.
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Your privacy is built in
Everything in Password Strength runs locally in your browser — your data never leaves your device and is never uploaded to a server, so nothing you enter is stored or seen by anyone else. No account, no sign-up, no watermark, and completely free.
Frequently asked questions
Is my password stored or sent anywhere?
Never. All analysis happens locally in your browser. Your password is not sent to any server.
What is password entropy?
Entropy measures the unpredictability of a password in bits. Higher entropy means harder to crack. 50+ bits is good; 80+ bits is excellent.
What makes a password strong?
Use 16+ characters, mix uppercase/lowercase/numbers/symbols, avoid common patterns (123, abc), and avoid repeated characters.