Password strength checker
Estimate password strength, entropy, and common weaknesses locally in your browser.
Offline estimate only. The password never leaves your browser.
No password
~0 bits estimated entropy
- - Use at least 12 characters.
- - Mix upper/lowercase letters and numbers.
Guide
Password Strength Checker: what it does and how to use it
What this Security tool does
This checker estimates password strength from length, character variety, repeated characters, and common weak patterns. It helps you understand why one password is easier or harder to guess than another.
How it works
Type or paste a password and the browser estimates entropy locally. The score is a practical guide, not a guarantee. Strong passwords should be long, unique, randomly generated, and stored in a password manager.
Examples
- Compare a short memorable password with a long passphrase.
- Check if repeated characters reduce strength.
- Teach users why length matters.
Security considerations
The password is never sent to SAVR. Avoid pasting real production passwords on shared or untrusted computers.
FAQ
Does this check breaches?
No. It is fully offline and does not call breach databases.
What makes a password strong?
Length, randomness, uniqueness, and avoiding common words or reused patterns.
Should I use the password generator too?
Yes. Generated random passwords are usually better than manually invented ones.