Password Strength Checker
Type a password to see its estimated strength and specific ways to improve it. Nothing is sent anywhere — checked entirely on your device.
About the Password Strength Checker
The Password Strength Checker rates how strong a password is and gives specific suggestions to improve it. The password is analysed in your browser as you type and is never sent anywhere, but as a habit you should still avoid typing your real, important passwords into any website you do not fully trust.
The tool estimates entropy: the length of the password multiplied by the number of bits per character, based on which character types you use (lowercase, uppercase, digits and symbols). Higher entropy means more guesses are needed. It also flags short length, missing character types, repeated characters and very common patterns. This is a simplified model: a long random passphrase is stronger than a short password with symbols, and a password that appears in leaked lists is weak whatever its entropy.
How to use it
- Type or paste a password to test, or use a similar example.
- Read the strength label and entropy estimate.
- Follow the suggestions listed, such as adding length or another character type.
- Create the real password with a generator and save it in a password manager.
Tips and good to know
- Length matters more than complexity; aim for 14 characters or more.
- Avoid names, birthdays and keyboard patterns.
- Use a different password for every account.
Frequently asked questions
Is it safe to test my real password?
The check runs locally, but test a similar password rather than the actual one to be careful.
Why is a long phrase rated strong?
Every extra character multiplies the number of possible guesses.
Does it check if a password was leaked?
No; it does not look up breach databases.