Password Strength Checker

Estimate password entropy and crack time locally

Check password strength with entropy estimates and crack-time hints — analyzed locally, never sent or logged.

Also known as: password strength meter · how strong is my password · password checker online · entropy calculator password

100% In-Browser & Private — your data never leaves this device
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How to use the Password Strength Checker

  1. Type or paste a password (optionally show characters).
  2. Review length, charset diversity, entropy bits, and estimated crack time.
  3. Use Secret Generator to create a stronger replacement — locally.

FAQ

Is my password sent to a server?
No. Analysis runs entirely in your browser — clear the field when finished.
Do you check breach databases?
No live breach lookups — this tool estimates strength from composition only. Use a dedicated breach checker for known leaks.
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