Password Strength Checker
Score a password's length, character variety and repeated patterns locally.
This tool runs entirely in your browser. Your files are never uploaded to a server.
Valid: Strong (score 62/100)
- Length: 11 characters
- Character types used: 4 of 4 (lowercase, uppercase, digit, symbol)
- No repeated or sequential adjacent-character pairs found.
Clear the entered value before starting another check. Validation runs locally and does not check against any external registry, server, or account.
What this tool does
Scores a password from 0 to 100 based on its length, the variety of character types it uses, and repeated or sequential adjacent characters, then labels the result from Very Weak to Very Strong.
How to use it
Type or paste a password. The score adds up to 2 points per character (capped at 24 characters) and 10 points per character type present (lowercase, uppercase, digit, symbol), then subtracts 3 points for each adjacent pair of identical or sequential characters.
Example
Tr0ub4dor&3 uses all four character types across 11 characters with no repeated or sequential pairs, scoring 62 (Strong), while password uses only lowercase letters across 8 characters and scores 23 (Weak).
Validation
A score of 40 or higher (Fair, Strong or Very Strong) is marked valid; below 40 (Weak or Very Weak) is marked invalid. The four character types checked are lowercase letters, uppercase letters, digits and symbols.
How to interpret the result
The score reflects length, variety and a simple repetition check only — it is not the result of checking the password against real-world breach or common-password lists, so a high score does not guarantee the password has never been leaked.
Limitations
No copy value is offered because there is nothing to normalize; treat the score as a rough local guide, not a substitute for your account provider's own password policy or a dedicated breach-list checker.
Privacy
All processing uses local browser APIs and this tool does not upload the values you enter.
Frequently Asked Questions
- What does Password Strength Checker do?
- Scores a password from 0 to 100 based on its length, the variety of character types it uses, and repeated or sequential adjacent characters, then labels the result from Very Weak to Very Strong.
- How does it handle invalid input?
- A score of 40 or higher (Fair, Strong or Very Strong) is marked valid; below 40 (Weak or Very Weak) is marked invalid. The four character types checked are lowercase letters, uppercase letters, digits and symbols.
- Is entered data uploaded?
- All processing uses local browser APIs and this tool does not upload the values you enter.