Password Strength Checker
Type or paste a password to see a strength rating, estimated crack time, and simple ways to make it stronger.
100% private — your password never leaves your browser.
This checker works entirely offline. Everything is analyzed locally on your device and nothing you type is sent to any server, API, or third party.
- Estimated crack time
- instantly
- Approximation based on a 10 billion guesses/sec attack — illustrative only.
- Estimated entropy
- 0.0 bits
No data is collected, transmitted, or stored. This tool has no network calls — you can even disconnect from the internet and it keeps working.
How Is Password Strength Calculated?
The checker estimates strength from password length, character variety, and common patterns. It flags sequential characters (like "1234" or "abcd"), repeated characters, and matches against a bundled list of the most common weak passwords.
The crack time is an illustrative approximation assuming 10 billion guesses per second and should be treated as a rough guide, not a precise measurement.