Security Tools

Password Strength Checker

Instantly check how strong a password is, right in your browser - never sent anywhere.

Free & instant No signup How to use FAQ

Enter a password to check

Checked entirely in your browser - never sent anywhere, not even to us.

Not sure what to enter?

Type a password below to instantly check its strength - entirely in your browser, your password is never sent anywhere, not even to us.

What makes a password strong?

Length matters most: a long passphrase of several unrelated words beats a short string of symbols. Strong passwords also avoid names, dates, keyboard patterns and anything reused on other sites. This checker estimates strength as you type, entirely in your browser - the password is never sent anywhere.

How to check a password's strength

Type a password into the box above - strength updates as you type.
Read the strength rating and suggestions.
Aim for at least 12-16 characters; a passphrase is easier to remember than random symbols.
Use a different password for every site, ideally stored in a password manager, and turn on two-factor authentication.

Related checks

To see how hashes work, try the SHA-256 Hash Generator.
To inspect login tokens, use the JWT Decoder.

The score is calculated in your browser from the password's length (8, 12 and 16 or more characters each earn more points), its mix of lowercase letters, uppercase letters, numbers and symbols, and how varied its characters are. Points are deducted for runs of the same character, keyboard patterns such as qwerty or 12345, and passwords on a list of the most commonly used ones. Length matters most: a long passphrase of unrelated words is both stronger and easier to remember than a short, complicated password. JustChecker builds tools that respect your data - this one never leaves your browser.

Frequently Asked Questions

No - this tool checks your password entirely in your browser using JavaScript. It is never transmitted anywhere, not even to us.

Length matters most - aim for at least 12-16 characters. Mixing uppercase, lowercase, numbers, and symbols helps, as does avoiding common words, keyboard patterns, and repeated characters.

Yes - a password manager can generate and store long, unique, random passwords for every account, which is far more secure than memorizing passwords yourself.

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