Security Tools
Breach Pattern Checker
Analyse your password for patterns that are disproportionately common in known data breaches. Detects keyboard walks, date patterns, leet-speak substitutions, dictionary fragments, repeated sequences, and 15+ other breach-risk patterns — all locally in your browser. No API calls. Your password never leaves this page.
All analysis happens locally in your browser. No data is uploaded.
🔒 Unlike haveibeenpwned.com (which sends a partial hash to an API), this tool performs entirely local pattern analysis. No hash, no network request, no server — just JavaScript running in your browser tab.
What This Tool Checks
| Pattern Category | Example | Breach Risk |
|---|---|---|
| Top common passwords | password, 123456, qwerty | Critical |
| Keyboard walk | qwerty, asdfgh, 1qaz2wsx | Critical |
| All-digit sequence | 123456, 654321 | High |
| Repeated block | abcabc, 123123 | High |
| Leet substitution | p@ssw0rd, s3cur1ty | High |
| Year suffix/prefix | password2024, 1988secret | Medium |
| Date pattern | 01011990, 12/25/1985 | Medium |
| Dictionary word base | correct123, sunshine! | Medium |
| Char class padding | Password1!, Secret99@ | Medium |
| All same character | aaaaaaa, 1111111 | Critical |