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Password strength checker

Score a password with zxcvbn — Dropbox's guessing model — and see exactly which dictionary words, repeats, or patterns an attacker would play first. The dictionaries load on first run; the password never leaves the tab.
Password to scoreScore password

- No breach-database check — that needs a third-party k-anonymity request (rejected by plan); zxcvbn knows common passwords from its bundled list only.
- The password lives in this tab’s memory while you type. Nothing is sent or stored — and a browser tab cannot guarantee the memory is zeroized after.
- A strong score on this page does not make a password right for your site — length, uniqueness per site, and how you store it matter more.
Nothing in yet

Paste, drop, or type to begin. Everything stays on this device.

type a password and score it

Next door in Crypto

- Password generator (/generate/password-generator)
- bcrypt (/crypto/bcrypt)
All crypto tools (/crypto)

Canonical HTML: https://nutter.tools/crypto/password-strength
Markdown version: https://nutter.tools/crypto/password-strength/index.md
Plain-text version: https://nutter.tools/crypto/password-strength/index.txt
Agent index: https://nutter.tools/llms.txt