Password Strength Checker
Test how strong a password is and estimate the time to crack it.
Password strength comes down to entropy — how many guesses an attacker would need. Length matters far more than complexity: a long passphrase beats a short string of symbols, because each extra character multiplies the search space. Yet most people optimize for the memorable-but-short passwords that fall fastest to modern cracking hardware.
Type a password and this tool estimates its strength from length and character variety, shows an approximate brute-force crack time, and flags weaknesses like being too short or using only one character type. It runs entirely in your browser — the password is never sent anywhere.
How to use Password Strength Checker
- 1
Type a password
Or try variations to see what strengthens it.
- 2
Read the strength rating
From very weak to very strong, with crack-time estimate.
- 3
Act on the feedback
Usually: make it longer.
Features
- Strength rating with visual meter
- Estimated brute-force crack time
- Private — nothing leaves your browser
Frequently asked questions
Common mistakes to avoid
- Relying on symbol substitutions (p@ssw0rd) that cracking dictionaries already anticipate.
- Reusing even a strong password across sites — one breach then exposes all of them.
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