Password strength checker
Type a password you already use. See how strong it is and whether it sits on a public leaked weak-password list. The password you test is not uploaded. Open the page and use it.
How this checker judges password strength
Searches for “password strength checker” or “how strong is my password” usually mean: will this reused login get guessed? PassAfer leaves the password in the input field. Strength, entropy, and risk hints are computed on this device.
The denylist comes from a public Top list of leaked weak passwords. It is there to catch password, 12345678, and other secrets that show up again and again. It does not send your password to an external API to search every known breach. A list hit is marked weak even if the string looks long.
- Live Weak / Medium / Strong / Very strong, plus rough offline brute-force and online rate-limited times
- Missing character classes, repeats, and similar patterns are listed as risks
- Need a replacement? Use the password generator locally. Do not tweak a few letters and keep reusing it
FAQ
Does a password strength checker upload the password I type?
No. Strength scoring, entropy estimates, and denylist checks run in the browser. The password you test is not sent to the server and is not queried against an external breach API.
Is this a Have I Been Pwned search? Can it prove my password never leaked?
No. This is not a full internet breach lookup. The tool compares against a built-in Top list of publicly leaked weak passwords. It cannot prove a password has never appeared in any breach.
What does entropy on the strength bar mean?
Entropy estimates how hard a password is to brute-force. Longer secrets with more character classes usually score higher. A hit on the weak-password list is still marked weak, even if the string looks long.
What should I do if the password is too weak?
Generate a new password with the password generator. Do not reuse it on important accounts. To send the new secret to a colleague, use a self-destructing message that burns after the first open.