Password Strength Checker
See how fast a password could be cracked and why, privately.
Strength Measured The Way Attackers Guess
Most strength meters count character types — a capital, a digit, a symbol — and so rate “P@ssw0rd1!” as strong, although it is one of the first guesses any cracker tries. This checker estimates the number of guesses a real attack would need by looking for what attackers actually try first.
It finds common and leaked passwords, dictionary words and names (reversed or in l33t), dates and years, keyboard walks like “qwerty” and “1qaz”, sequences and repeats, and brute-forces only what is left. You see the estimated guesses, entropy in bits, crack time under four attack scenarios, how an attacker would split your password, and specific advice.
Key features
- Pattern-based estimate — dictionaries, dates, keyboard walks, l33t.
- Crack time for rate-limited and offline attacks.
- Breakdown of how an attacker would read it.
- Specific advice, not generic rules.
- Completely private — never sent, stored or logged.
This tool runs entirely inside your browser using native Web APIs. Your files and text are never uploaded to a server, never logged and never shared with third parties.
How to use: Password Strength Checker
- Type a password
Or a pattern like the ones you use. - Read the verdict and crack times
Offline fast-hash time is the worst case after a data breach. - Look at the breakdown
Each part shows what an attacker would recognise. - Follow the advice
Usually: longer, less predictable, and unique per site.
Technical specifications
| Processing location | Entirely in your browser — no server round trip |
|---|---|
| Data uploaded | None. Files and text never leave your device |
| Price | Free — no account, no trial, no usage cap |
| Category | Security |
| Works offline | Yes, once the page has loaded |
| Browser support | Chrome 90+, Edge 90+, Firefox 90+, Safari 15+ |
| Interface languages | English, 中文, हिन्दी, Español, العربية |
Frequently asked questions
Is it safe to type my real password here?
The check runs entirely in your browser — nothing is transmitted, saved or logged, and it works offline. If you prefer, test a password with the same structure instead of the real one.
What makes a password strong?
Length and unpredictability. Four or more random, unrelated words, or a long random string from a password manager, beat short complex passwords built from a word, a year and a symbol.
Why is “Summer2024!” weak?
It is a dictionary word, a recent year and a common symbol in the most common order — exactly the pattern crackers try early. It meets complexity rules and still falls quickly.
What do the crack-time scenarios mean?
Online attacks are limited by the website (a few guesses per second or hour). Offline attacks happen after a breach, when attackers test guesses against stolen hashes at speeds from thousands to billions per second, depending on how the site stored them.
How is this different from a password generator?
A generator creates random passwords; this checker evaluates any password, including ones you already use. Pair it with the Strong Password Generator or Secure Passphrase Generator for replacements.