What Password Strength Checker does
Password Strength Checker estimates a character pool from the kinds of characters present and combines that pool with grapheme length. It then reduces the estimate for repeated characters, recognizable sequences, and a small built-in list of common passwords.
The displayed entropy is a composition-based approximation, not a measured cracking time. A password can score well while still being reused, leaked, patterned in a way the checker does not recognize, or stored by an unsafe service.
How to use Password Strength Checker
- Enter the candidate password directly into the password field.
- Read the assessment, score out of four, and rough entropy estimate.
- Review every feedback item, especially common words, sequences, repeated characters, and insufficient length.
- Prefer generating and storing a unique password in a trusted password manager rather than tuning a memorable pattern to the score.
Important details
What affects the score
The estimate considers lowercase, uppercase, digits, symbols, some non-ASCII characters, grapheme length, repeated runs, common sequences such as 1234 and qwerty, and a small common-password set.
What the score cannot know
The checker has no breach lookup, account context, reuse history, password-manager data, service-side hashing details, or model of every phrase and personal pattern an attacker might try.
Practical uses
- Explain why length and uniqueness matter when teaching password hygiene.
- Spot obvious repeated characters or sequences before saving a new credential.
- Compare generated examples without transmitting them to a remote checker.
Privacy and limitations
The assessment runs in the browser and the password is not sent to PagesTools. Avoid using an untrusted device, extension set, keyboard logger, or screen-sharing session for any real secret.
This is a heuristic and cannot certify that a password is safe, unique, or absent from breaches. Its common-password list is deliberately small, and the entropy number assumes randomness that human-created passwords rarely achieve.