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Password Strength Checker

100% Free

Check how strong your password is, see an estimated crack time, a class-by-class breakdown, and clear tips to make it stronger — instantly and entirely in your browser.

Live Scoring
Crack Time
Breakdown
100% Client-Side

1. Enter your password

Everything runs in your browser. Your password is never uploaded, logged, or stored.

2. Strength

Enter a password to see its strength, estimated crack time, and tips.

Embed This Tool

Easy to Embed

Add Password Strength Checker to your website or blog in seconds.

  • Responsive design
  • Lightweight & fast
  • No backend required
  • Always up-to-date 
<iframe
  src="https://tools.town/embed/password-strength-checker/"
  width="100%"
  height="600"
  style="border:none; border-radius:12px;"
  loading="lazy"
  title="Password Strength Checker">
</iframe>

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Share Password Strength Checker with anyone — no login required.

  • Shareable link
  • No login required
  • Works on any device
  • No account needed

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How to Use

  1. 1 Type or paste the password you want to test
  2. 2 Watch the strength meter update live as you type
  3. 3 Read the estimated time to crack it
  4. 4 Check the class-by-class breakdown (length, case, digits, symbols)
  5. 5 Apply the tips, or generate a strong password in one click

Features

  • Live strength score from very weak to very strong
  • Estimated brute-force crack time based on entropy
  • Class-by-class breakdown checklist
  • Flags common passwords and obvious patterns
  • One-click strong-password generator (in-browser)
  • 100% client-side — your password never leaves your device

Why it Matters

Weak and reused passwords are behind the vast majority of account takeovers. Seeing exactly why a password is weak — and how long it would take to crack — turns abstract advice into a concrete fix you can make in seconds, before it protects an account that matters.

★★★★★

Use Cases

Everyday Accounts

Test a new password before you commit to it

Work & IT

Show colleagues why a password fails policy

Teaching Security

Demonstrate length vs complexity to students

Password Hygiene

Audit your most important logins one by one

What this tool does

The Password Strength Checker scores any password from very weak to very strong, estimates how long it would take to brute-force, breaks down which character classes it uses, and gives you specific tips to make it stronger — all live as you type, entirely in your browser.

How it works

The checker measures the password’s length and which character classes it contains, then estimates entropy from the size of the resulting character pool. It penalises known-common passwords and obvious patterns (sequences like 1234, repeats like aaaa), and maps the result to a 0–4 score with a friendly crack-time estimate.

Privacy

Your password is processed entirely on your device with JavaScript. Nothing you type is uploaded, logged, or stored. For peace of mind, you can disconnect from the internet and the tool still works.

Strength is necessary, not sufficient

A strong password is one layer. Always pair it with two-factor authentication and never reuse passwords — a unique password per site means a single breach can’t unlock everything else.

Frequently Asked Questions

How is the strength score calculated?
The tool scores length and which character classes you use (lowercase, uppercase, digits, symbols), then estimates entropy from the resulting character pool. It also penalises known-common passwords and obvious patterns like 1234 or repeated characters, mapping everything to a 0–4 score.
What does 'time to crack' mean?
It's an estimate of how long a fast offline attacker (assuming about 10 billion guesses per second) would take to brute-force the password, on average. It's a guide, not a guarantee — a leaked or reused password can be cracked instantly regardless of strength.
Is it safe to type my real password here?
Yes. The check runs entirely in your browser using JavaScript. Your password is never sent to a server, logged, or stored. That said, the safest habit is to test passwords similar in structure to your real ones.
Why is length more important than symbols?
Each extra character multiplies the number of possible combinations, so adding length increases crack time far faster than swapping one letter for a symbol. A long passphrase usually beats a short, complex password.
Does a high score mean my account is safe?
Not on its own. A strong, unique password is necessary but not sufficient — also enable two-factor authentication and never reuse passwords across sites.
📖

Want to understand the math?

Browse all guides →
How Password Strength Really W
password

How Password Strength Really Works: Entropy, Length & Crack Time

A clear guide to what makes a password strong — how entropy and character pools work, why length beats complexity, how crack-time estimates are calculated, and the habits that matter more than the score.

25 Jun 2026

5 min read

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