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Privacy & security

Password Strength Tester

Produces an explainable estimate from password length, character pool, repetition, and common patterns. The password remains in browser memory; no breach database is queried and no absolute security guarantee is made.

FreeNo accountIn-browser
Input never leaves this page.

The password is not sent to the network, a breach service, or localStorage.

StrengthVery weak
0Characters
0.0Estimated entropy bits
0.0 secondsAt 10B guesses/sec
  • 16+ characters
  • Broad character pool
  • No obvious common pattern
Improvement suggestions
  • Shorter than 12 characters.
  • Character variety is low.

Crack time is a mathematical estimate; real outcomes depend on the hash/KDF, attack method, and breach exposure.

HOW TO USE IT

A result in three steps

  1. 01

    Avoid entering a real password on a shared device; use a representative sample when possible.

  2. 02

    Review the strength level, entropy estimate, and warnings.

  3. 03

    Replace short or predictable structure with a longer unique passphrase.

GOOD USE CASES

When is this tool useful?

  • Pre-checking a new password
  • Password-policy education
  • Comparing length and character variety
Important limitation

Automated output is a preliminary assessment. Do not use it alone for legal, financial, medical, or security-critical decisions.

ABOUT THIS TOOL

Frequently asked questions

Does this tool send input to a server?+

No. Processing runs in this browser tab. Data leaves the page only when you choose to copy or download the result.

Is the result definitive?+

The tool produces consistent output from disclosed rules and browser APIs, but context, data quality, and method limitations can affect it. Verify high-impact decisions.

Is input saved?+

No. Tool input is not persisted to localStorage or another durable store. Only a non-sensitive tool-usage count may be kept on this device for personalized home-page shortcuts.