Password Strength Checker
Test password strength with entropy estimation, crack time, and visual feedback.
Entropy
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Password Strength Checker
Not all passwords are equal. This checker calculates entropy (bits of randomness), estimates crack time against a billion-guesses-per-second attack, and gives specific tips to improve weak passwords.
Related: Password Generator, SHA-256 Generator.
FAQ
Is this tool free to use?
Yes. The tool is free to use in your browser and does not require an account.
Do I need to install anything?
No. The workflow runs in a normal modern browser, so you can use it on desktop or mobile without installing extra software.
Is my input uploaded to a server?
No. All generation happens locally in your browser. Your input data never leaves your device.
Can I customize the output?
Yes. Use the options on the page to adjust format, size, style, or content before generating.
What formats can I download?
Download options depend on the generator. Common formats include PNG, SVG, PDF, and plain text.
Can I use this for business or client work?
Yes, but you should still verify important results and keep source files when the work affects billing, security, legal, or operational decisions.