Password Strength Checker
Score a password by information entropy (length × log2 charset), then deduct for common passwords, repeated runs, keyboard and alphabet sequences, and embedded years. Reports entropy, charset size, a strength level, crack-time estimates for online throttling and offline GPU attacks, plus a per-check breakdown. Nothing is uploaded or stored.
The password is evaluated inside this browser tab only — nothing is uploaded, stored or turned into a link. Open the network panel to confirm no requests are made.
About this tool
Score a password by information entropy (length × log2 charset), then deduct for common passwords, repeated runs, keyboard and alphabet sequences, and embedded years. Reports entropy, charset size, a strength level, crack-time estimates for online throttling and offline GPU attacks, plus a per-check breakdown. Nothing is uploaded or stored.
How to use
- Fill in the input box above, or click "Fill sample" to try it instantly
- Adjust the options as needed — results update as you type
- Click "Run" to get the result, then copy or export it in one click
Tips
- Runs entirely in your browser — your data never leaves the device
- Completely free, no registration, no usage limits
- Most tools compute in real time as you type