Password Strength Checker

Type a test password and watch a nine-point checklist, a color-coded strength bar, an entropy estimate in bits, and a rough crack-time bracket update on every keystroke, all calculated inside your browser.

What is the Password Strength Checker?

The Password Strength Checker is a browser-based scorer that rates whatever you type on a 0-100 scale and labels it Very Weak, Weak, Fair, Strong, Very Strong, or Excellent. Points come from clearing length thresholds at 8, 12, 16, and 20 characters plus the presence of uppercase, lowercase, digits, and symbols, with a bonus for using all four classes and smaller ones for a second capital, digit, or symbol. Separately it estimates entropy as your length multiplied by the log base 2 of the character pool you drew from, then maps that bit count onto a crack-time bracket.

Key Features

• Nine-point checklist covering length, character classes, triple repeats, and abc/123 runs
• Score and color-coded bar update live on every keystroke
• Entropy in bits, calculated from the character pool you actually use
• Crack-time bracket running from Instantly through Centuries and Millennia+
• Masked input with an eye toggle; nothing is uploaded or stored

Common Use Cases

• Comparing two candidate passwords side by side before committing one to your password manager
• Showing a team or family why a 20-character passphrase beats a short cryptic one
• Checking whether a policy-compliant password earns real entropy or merely clears the rules
• Testing a stand-in with the same length and character mix as a password you already use

How to Use the Password Strength Checker

1. Select the sample text in the Enter Password field and type your own test string over it.
2. Click the eye icon at the right of the field to unmask it and proofread what you typed.
3. Watch the bar and its label move between Very Weak and Excellent as each character lands.
4. Scan the nine criteria for red X marks, then read the character, entropy, and crack-time cards.
5. Add length rather than punctuation and watch the bit count climb faster than the label does.

Tips for Best Results

• Length beats symbols: every extra character multiplies the search space, while a new character class only widens it.
• Aim for 16 characters or more, which clears every length rule here and passes 100 bits with mixed classes.
• A long lowercase passphrase can show a middling score but a huge bit count -- trust the bits.
• Reuse is the real danger: a unique password per site, kept in a password manager, beats a memorable clever one.

Why Use WiserWork's Password Strength Checker?

Most strength meters hand you one word and no reasoning. This one shows the whole scoreboard at once: which of the nine rules passed or failed, how many bits of entropy your length and character pool produce, and where that bit count lands on a crack-time scale. All of it is computed by the page's own JavaScript as you type, so the text in the box is never transmitted or saved.

Who Uses the Password Strength Checker?

It suits anyone setting up a new account, tightening an old password, or trying to understand why a password policy demands what it does. Support and IT staff use it to demonstrate the length-versus-complexity trade-off to non-technical colleagues in seconds, and teachers use it to make entropy concrete. It is a teaching and comparison tool rather than an audit: it judges the shape of a password, not whether that specific password has already leaked.

Frequently Asked Questions

Is my password sent anywhere when I type it here?

No. The score, the entropy math, and the checklist all run in JavaScript inside this page, and what you type is never transmitted or saved. Even so, you should not type a password you actually use into any website, this one included -- test a stand-in with the same length and character mix instead.

How is the strength score calculated?

Points are awarded for passing the 8, 12, 16, and 20 character length thresholds and for including uppercase, lowercase, digits, and symbols, with a bonus for using all four classes and small bonuses for a second capital, digit, or symbol. The total is capped at 100 and mapped to the labels Very Weak through Excellent.

What does the entropy number actually mean?

It is your password length multiplied by the log base 2 of the character pool it draws on -- 26 for lowercase, plus 26 for uppercase, 10 for digits, and 32 for symbols, counting only the classes you used. Each additional bit doubles the number of guesses a brute-force attack has to grind through.

Does it check my password against breaches or common-password lists?

No. There is no dictionary, leak database, or breach lookup behind it, which is precisely why nothing you type needs to leave the page. It also means a notorious password like P@ssw0rd! still scores Very Strong here, so use a dedicated breach-checking service to find out whether a password has already been exposed.

Why does my long passphrase score lower than a short messy password?

The checklist rewards character variety, so an all-lowercase phrase fails the uppercase, digit, and symbol rules and lands around Fair. Read the entropy card instead: 28 lowercase characters come out near 131 bits, roughly twice what a nine-character mix of all four classes produces.

How accurate is the estimated crack time?

It is a rough bracket rather than a measurement. The tool sorts your entropy figure into six ranges using fixed cutoffs at 28, 36, 60, 80, and 100 bits, and real-world cracking speed depends on the attacker's hardware and on how the site stored your password hash.

Why do the repeat and sequence checks not move my score?

Those two rows are informational only: triple repeats such as aaa and runs such as abc or 123 are flagged in the checklist but no points are deducted for them. Treat a red X on either as a warning that a smart guessing attack would reach your password sooner than the score implies.

Is adding a symbol better than adding one more letter?

Adding symbols lifts the pool from 62 to 94 characters, worth about 0.6 extra bits per character, so roughly 7 bits on a twelve-character password. One extra character is worth about 6.5 bits by itself, and every character after that adds the same again -- which is why length scales and punctuation does not.

Which characters count as symbols?

Common punctuation passes the symbol test, including the usual shifted number-row characters, brackets, braces, quotes, the pipe and the backslash. A plain space does not count, so a passphrase typed with spaces is scored as lowercase only.

Why is MySecureP@ss123! already filled in?

That sample runs the moment the page loads so the bar, checklist, and three info cards show real output instead of empty boxes. Select it and type over it -- it is a demo string and would be a poor choice for a real account.

The Password Strength Checker turns password advice into numbers you can see: nine pass/fail criteria, a bit count, and a crack-time bracket. Test a stand-in, learn what actually moves the numbers, then let a password manager generate the real thing.