Password Strength Checker
Score password strength with improvement advice.
🛡Password Strength Checker
All processing happens locallyWhat this tool does
Password Strength Checker is a local password strength analyser, the password is analysed only in your browser and never sent or logged, so real passwords are safe to test.
Strength comes from length more than complexity: a random 12-character password beats an 8-character one with symbols, and 16 or more is effectively unbreakable.
How to use it
- Paste or type your content into the input field at the top, or press the sample button to load demo data.
- Adjust the options below the input, such as output format, separators, letter case or precision.
- Press the main button to run the conversion. Results appear instantly in the output panel without a page reload.
- When the result looks right, use the copy button in the corner, or download it as a local file.
Tips and notes
Clean up stray spaces and line breaks before pasting for more accurate results.
FAQ
Length, character pool size, hits in common password lists and repetition patterns, estimating brute force effort as a rough guide.
No. Everything is computed locally; nothing is sent or stored.
Twelve characters for normal accounts and sixteen or more plus two-factor authentication for critical ones.
Yes. The tool is completely free with no usage limits, and you never need an account or a sign-in.
No. All processing runs locally in your browser, so the input never reaches a server and is never logged or stored.
Yes. The layout is mobile-first, so inputs and buttons stay comfortable on phones and tablets in both orientations.
Yes. A copy button in the output panel puts the result on your clipboard, and you can also download it as a text file.