Estimate password guessability locally with the self-hosted zxcvbn pattern model. No passwords or breach queries leave your browser.
The model and dictionaries are hosted with this website and run in a local worker. Your password is not sent to any service, and no password history is stored.
A zxcvbn pattern estimate, not proof of safety or a breach check. The model is English-oriented and cannot account for every language, personal detail, leak or attacker. No crack-time promise is made. The summary excludes the password.
No. Processing uses local browser JavaScript and workers. Inputs are not stored, logged, placed in URLs or sent to external services. Clipboard or downloads occur only when you choose.
Input and result references are released and any active worker is terminated. JavaScript cannot guarantee physical memory erasure or remove screenshots, copied clipboard data or downloads. Clear those separately if needed.
No tool can guarantee security of a device, a password or a file. Strength is a local model estimate; file hashing verifies bytes against a supplied digest. Encryption protects compatible text under its stated format and passphrase assumptions.
