Password Strength Checker — zxcvbn Powered
zxcvbn goes beyond naive length/character rules — it checks against dictionaries, common patterns, and keyboard walks to estimate realistic crack times. Your password is never transmitted or logged.
// Features
- ▸0–4 strength score with visualisation
- ▸Estimated online and offline crack times
- ▸Actionable improvement suggestions
- ▸Fully local — password is never sent
// How to use
- 01Type or paste a candidate password.
- 02Read the score and estimated crack time.
- 03Follow the suggestions to strengthen it.
// FAQ
Your data never leaves your browser. This tool runs 100% locally — no upload, no logging, no analytics on your inputs.
// Related tools
Password Generator
Generate strong passwords with configurable length, character sets and exclusions.
JWT Decoder
Decode JWT header and payload with human-readable timestamps. Signature verification is intentionally out of scope.
Base64 Encoder
Encode/decode Base64 with proper UTF-8 handling. Optional URL-safe alphabet.