Password Strength Auditor

Understand what makes a password strong: entropy, length and the absence of predictable patterns.

A password's strength does not come from swapping a letter for a symbol, but from how unpredictable it is to whoever tries to guess it. This tool estimates entropy in bits from the character set in use, projects how long it would take to crack under different attack scenarios and flags weak patterns such as sequences, repeats, keyboard runs and already-leaked passwords. The goal is to inform the decision, not to replace a password manager.

How to read the result without losing context.

1. Type or paste the password you want to evaluate, it stays only in the browser.
2. Read the rating alongside the entropy, estimated crack time and flagged weak patterns.
3. Apply the suggestions and, ideally, generate the final password in a trusted password manager.

Use this tool on your site

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Sources and references for this tool

These references help contextualize formulas, standards, APIs and limitations used on this page. They do not replace professional validation when a result has legal, financial, medical or operational impact.

• NIST SP 800-63B, Memorized SecretsNIST, Modern criteria for password strength and length.
• OWASP Password Strength ControlsOWASP, Best practices for password evaluation and policy.
• Crypto.getRandomValues()MDN Web Docs, Cryptographic randomness API used for strong password generation.

Frequently asked questions

Where to go next