Password Strength Checker
Check password length and character classes in your browser. The password is never sent anywhere. Free and private.
No uploads. No account. Free to use.
Score 0/5 — Very weak. Length 0.
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- Files never leave your device
- Runs entirely in your browser
- No signup required
- Free
What is Password Strength Checker?
Password Strength Checker scores a password locally by length and character classes. The value never leaves this tab and is not logged.
Key features
- Length and character-class score
- Never sent to a server
- Pairs with the password generator
How to use it
- Open the Password Strength Checker.
- Type a password in the field.
- Read the local score. Nothing is submitted.
When to use it
Use it to sanity-check a new password without pasting it into an online tester that could retain the secret.
In this family
Hash & security — related tools in the same cluster.
Frequently asked questions
Is my password uploaded?
No. Scoring is local JavaScript only.
Does this use AI?
No.
Do you store the password?
No. It lives in the input until you leave the page.
Related tools
More in Developer tools.