🔐 Security Tools
Real crack-time estimates powered by zxcvbn (the same realistic scoring engine Dropbox built and uses) — not a fake checker that just counts uppercase letters and symbols.
💡 Tip: for a true test, type a variation of your real password (change a few characters) rather than your actual one — even though nothing leaves your browser, it's a good habit.
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Generated using crypto.getRandomValues() — a cryptographically secure random source, never Math.random(), which is not safe for anything security-related.
Uses a curated 638-word list (inspired by the Diceware method — this is our own hand-picked list, not the official 7,776-word EFF list). More words = more security; 6+ words is a good default, use 4 only for the comparison below.
Paste multiple passwords, one per line. Same privacy rules apply: this list never leaves your browser, isn't stored, and isn't logged anywhere — not even here.
| Length beats symbols | Every extra character multiplies the guesses an attacker needs. A 16-character password of just lowercase words is usually stronger than an 8-character password with symbols crammed in. |
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| Reuse is the real risk | The single biggest cause of account takeovers isn't a "weak" password — it's using the same password on multiple sites. One breach anywhere exposes every account sharing that password. |
| Password managers | A password manager generates and remembers a unique, random password for every site, so you only need to remember one master password (ideally a long passphrase). |
| What 2FA adds | Two-factor authentication means a leaked or guessed password alone isn't enough to log in — the attacker also needs your phone or authenticator app. It's the single best thing you can add on top of a strong password. |
| Checking for breaches | Have I Been Pwned (haveibeenpwned.com) lets you check if a password has appeared in a known breach, using a clever technique called k-anonymity: it only sends the first 5 characters of your password's hash, never the password itself, so the service can't reconstruct it. Our tool goes even further and sends absolutely nothing at all — everything happens locally. |
ToolAdda's password strength checker uses zxcvbn — the same realistic scoring engine Dropbox built — to estimate how long your password would take to crack under real attack scenarios. Unlike fake checkers that only reward uppercase letters and symbols, zxcvbn detects dictionary words, keyboard patterns, dates, and common substitutions like P@ssw0rd.
No. Every calculation happens in your browser using JavaScript that runs locally. Nothing is sent over the network, nothing is stored in localStorage or cookies, and this page doesn't even load analytics — open your browser's Network tab, type a password, and confirm zero requests happen.
zxcvbn is a realistic password strength estimator built by Dropbox. It models how attackers actually guess passwords — dictionary words, keyboard walks, dates, names, and l33t substitutions — instead of just counting character types.
Length matters more than complexity. A random 16+ character password or a 6-word random passphrase is far stronger than an 8-character password stuffed with symbols, because every extra character multiplies the number of guesses an attacker needs.
Not as much as people think. Adding one symbol to a short, dictionary-based password barely slows down an attacker who already tries common substitutions like @ for a or 0 for o. A longer password or passphrase without any symbols is usually stronger than a short one with symbols.
Often yes, and it's easier to remember. Several random unrelated words strung together create a long password with high guess-resistance, without needing to remember symbol substitutions.
Yes — completely free with no sign-up. All checking, generation, and bulk audit runs locally in your browser.