Password Strength Checker
7 toolsCheck the strength and entropy of your own password.
Runs in your browser — your files and text stay on your device
Check how strong a password is by its length, variety and common patterns. Strength depends mostly on length and unpredictability, and an estimate can't account for whether the password has already leaked. The check runs locally in your browser, but avoid typing a real password into any site you don't fully trust.
Password GeneratorPassphrase GeneratorPassword Strength CheckerPIN GeneratorBulk GeneratorUsername GeneratorSecret/API Key Generator
How to use this tool
- 1Type or paste a password.
- 2See its estimated strength and entropy.
- 3Follow the suggestions to improve it.
Frequently asked questions
Is my password sent anywhere?
No — the check runs entirely in your browser; nothing is transmitted or stored.
How is strength estimated?
From character-set entropy, with penalties for common passwords, repeated characters, and sequential patterns — not a database lookup.