Password Strength Checker
Check how strong your password is — entropy, estimated crack time, common-password check and tips. Runs only in your browser.
Result
How to use
- 1
Type or paste a password (try a test one rather than your real password if you prefer).
- 2
See its strength, entropy in bits and how long attackers would take to guess it.
- 3
Follow the tips to make it stronger.
Questions
How is strength calculated?
We estimate entropy — how many guesses an attacker needs — from the length and the types of characters, then reduce it for predictable parts such as common passwords, dictionary words and names, sequences like 1234 or qwerty, repeated characters and years.
Is it safe to type my password here?
The check runs entirely in your browser with JavaScript; nothing is sent over the network or stored. If you prefer, test a password with the same pattern instead of the real one.
What makes a strong password?
Length matters most. Use 14+ characters, or a passphrase of 4–5 random words, and a different password for every site. A password manager and two-factor authentication (OTP or authenticator app) protect you far more than clever substitutions like @ for a.
About this Password Strength tool
Password Strength Checker — Check how strong your password is — entropy, estimated crack time, common-password check and tips. Runs only in your browser. It is one of 200 free tools on namasivayam.in, made by software engineer Namasivayam Vadivelan for everyday use in India.
Everything is calculated instantly in your browser: nothing you type or upload is sent to any server, there is no sign-up, and it works on mobile and desktop. Type or paste a password (try a test one rather than your real password if you prefer).
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Results are estimates to help you plan. They are not financial, tax or medical advice.