Password Strength Checker

What is Strength Check?

A strength meter that estimates entropy from character variety and length, flags common passwords and patterns, and estimates time-to-crack.

How it works

Entropy is computed from the character-pool size and length; common-password and pattern checks add feedback; crack time assumes an optimistic online attack rate.

1. Enter your input. Type or paste your input into the field above — the tool responds instantly.
2. Review the result. Output updates live as you type. Everything runs entirely in your browser.
3. Copy or download. Use the Copy button to grab the result, or Download to save it as a file.

Examples

Realistic sample

Paste or type any realistic input — the tool computes the result locally and instantly.

Common mistakes

Expecting a server round-trip

Nothing is uploaded — every tool in this category runs entirely in your browser.