Generators
Password Strength Checker
Test how strong a password really is — entropy, crack-time estimate and a fix-it checklist.
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About this tool
Is your password actually strong, or just complicated-looking? This checker analyzes length, character variety and common-password lists to score entropy in bits, estimate offline crack time, and show a checklist of exactly what to improve.
Everything runs locally — the password is analyzed in your browser and never transmitted, logged or stored, which is the only safe way to test a real password.
How to use
- Type or paste a password.
- Read the strength bar, entropy and crack-time estimate.
- Fix the ✗ items in the checklist to strengthen it.
Frequently asked questions
The check runs 100% in your browser — nothing is sent anywhere. Still, the safest habit is testing a similar-pattern password rather than the exact one.
A measure of unpredictability in bits: length × log₂(character-pool size). 60+ bits is decent; 80+ is strong; 100+ is practically uncrackable offline.
Length. Each added character multiplies crack time far more than swapping a letter for a symbol. A 16-character lowercase phrase beats an 8-character symbol soup.