Password Strength Checker
Check password strength and crack-time estimates privately in your browser. Your work stays on this device whenever possible.
How to use Password Strength Checker
- Type or paste the password; it stays hidden unless you tick "Show password".
- Read the Strength rating and the estimated entropy in bits.
- Compare the online (100 guesses per second) and offline (10 billion per second) crack-time estimates.
- Follow the tips to fix weaknesses such as common words, sequences or repeated characters.
What Password Strength Checker does
Check password strength and crack-time estimates privately in your browser.
Parsing and conversion happen locally with browser JavaScript. Secrets should still be removed because copied output can remain in your clipboard history. For Password Strength Checker, the operation is specifically to check password strength and crack-time estimates privately in your browser.
Worked example
Typing password1 gives Very weak with a note that it is on lists of the most common passwords. A random 16-character password such as Tq7!vR2#pLm9@xW4 rates Very strong, with offline crack time estimated in billions of years.
When Password Strength Checker is the right tool
- Checking a new password before using it for email or banking.
- Showing a team why short or patterned passwords are unsafe.
How to verify the result
Test a small known sample first, then inspect quotes, escapes, dates, and character encoding in the output. The final Password Strength Checker output should visibly match this goal: Check password strength and crack-time estimates privately in your browser.
Important limitations
Estimates assume a well-equipped attacker who knows common patterns; they are a guide, not a guarantee. Nothing typed leaves the browser.
A free Password Strength Checker alternative
People looking for Password Strength Checker often compare products such as JSONFormatter, RegExr, Postman. ToolkitPoint is not affiliated with those services. This page keeps check password strength and crack-time estimates privately in your browser free and available without an account; features, limits, and policies on other products can change, so compare their current product pages before choosing.
Last updated: September 15, 2026
Frequently asked questions
Is it safe to type a real password here?
The check runs entirely in this tab and the password is never sent, stored or logged. Even so, the safest habit is to test a password of the same style rather than the exact one you use.
What does entropy in bits mean?
It estimates how many guesses an attacker would need: each extra bit doubles the work. The tool starts from length and character types, then subtracts for patterns attackers try first, such as common passwords, sequences and years.
Why are there two crack times?
Online attacks against a login page are slow, about 100 guesses per second or less. Offline attacks on a stolen password database can run billions of guesses per second. A strong password must survive the offline case.
Why is my long password rated weak?
Length helps only if it is unpredictable. Passwords built on common passwords, keyboard runs like qwerty or 1234, or repeated characters are guessed early, so the estimate drops sharply.
What makes a password very strong?
About 16 random characters, or a passphrase of four or more random words, unique to each site. A password manager can create and remember these for you.