How can I check password strength without sending my password anywhere?

Use the password strength checker above: type your password and run it. All scoring happens in your browser with an open-source engine — your password is never uploaded, stored, or transmitted, so it is safe to test real passwords here.

What does a password strength meter actually measure?

A good meter estimates how many guesses an attacker would need, not just length and character counts. This meter uses zxcvbn-ts, which checks your password against dictionaries of common words, names, and patterns (repeats, sequences, l33t substitutions) and converts the estimated guess count into a 0–4 score plus a crack-time estimate.

How strong is my password really?

Paste it into the checker above for an instant estimate: you get a 0–4 score, a label from Very weak to Very strong, and an estimated crack time. Remember the score is an estimate — a password is only truly strong if it is also unique to one account and not reused anywhere.

What makes a password security checker trustworthy?

Two things: a proven scoring engine and client-side processing. This checker uses the open-source zxcvbn-ts engine (the TypeScript port of Dropbox's zxcvbn) and runs entirely in your browser, so your password never leaves your device. The methodology names the engine and its limits openly.

How do I pass a strong password test?

Length beats complexity tricks: a long passphrase of unrelated words (like the "correct horse battery staple" example, which scores 4) beats a short password with symbols. Test your password above and follow the improvement suggestions until you reach Strong or Very strong.

Is it safe to type my real password into this checker?

Yes — the check runs 100% in your browser. The page never sends your password to a server, stores it, or logs it, and the tool never displays your password back in its results. Still, use unique passwords per account so one leak never compromises everything.

Password Strength Checker — Test Your Password

What is Password strength checker?

Password Strength Checker — Free password strength checker: test password strength instantly — 0–4 score, crack-time estimate, and improvement tips. Runs 100% in your browser.

Scoring is done by zxcvbn-ts, the open-source TypeScript port of Dropbox's zxcvbn password-strength estimator (vendored). It matches your password against an English dictionary of common words, names, and Wikipedia terms plus pattern detectors (repeats, character sequences, l33t substitutions), estimates how many guesses an attacker would need, and converts that into a 0–4 score and a crack-time display. The crack time shown is the offline slow-hash scenario (10,000 guesses/second, like bcrypt) — real attacks vary widely, so treat every score as an estimate, not a guarantee. Everything runs client-side; your password never leaves your browser.

Why use this password strength checker?

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Built for password strength checker

Free password strength checker: test password strength instantly — 0–4 score, crack-time estimate, and improvement tips. Runs 100% in your browser.

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Transparent & honest

Scores are heuristic estimates of guessability, not guarantees — a high score does not make a password uncrackable.

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Private by design

Everything runs in your browser. Your inputs never leave your device.

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Works everywhere

Fully responsive — perfect on desktop, tablet, and mobile. No app needed.

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Regularly updated

Regularly maintained and reviewed to ensure accuracy.

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Free forever

No accounts, no limits, no watermarks. Use Password Strength Checker as much as you need.

How to use Password Strength Checker

1Type a password into the "Password to test" field. Your password is never sent anywhere — scoring happens in your browser.
2Run the tool to get a 0–4 strength score, a plain-language label (Very weak to Very strong), and an estimated crack time.
3Read the improvement suggestions — add length and unpredictability to raise your score.
4Try variations of your password and re-run until you reach Strong or Very strong.
5Use a unique strong password for every account; consider a password manager instead of reusing one.

What can you do with Password Strength Checker?

Check password strength without sending password anywhere — Free password strength checker: test password strength instantly — 0–4 score, crack-time estimate, and improvement tips.
What password strength meter measures — Free password strength checker: test password strength instantly — 0–4 score, crack-time estimate, and improvement tips.
How strong is my password — Free password strength checker: test password strength instantly — 0–4 score, crack-time estimate, and improvement tips.
What makes password security checker trustworthy — Free password strength checker: test password strength instantly — 0–4 score, crack-time estimate, and improvement tips.
Safe to type real password into checker — Free password strength checker: test password strength instantly — 0–4 score, crack-time estimate, and improvement tips.

Good to know

Scores are heuristic estimates of guessability, not guarantees — a high score does not make a password uncrackable.
The crack time shown is one scenario (offline attack at 10,000 guesses/second); online throttled attacks are far slower and fast-hash offline attacks far quicker.
Only the English dictionary pack is bundled and no keyboard-adjacency graphs, so non-English common words and keyboard walks (e.g. "qwerty") may score slightly higher than they deserve; the meter also cannot know if your password was exposed in a breach.
Passwords longer than 512 characters are truncated to 512 before scoring.

How it works

Scoring is done by zxcvbn-ts, the open-source TypeScript port of Dropbox's zxcvbn password-strength estimator (vendored). It matches your password against an English dictionary of common words, names, and Wikipedia terms plus pattern detectors (repeats, character sequences, l33t substitutions), estimates how many guesses an attacker would need, and converts that into a 0–4 score and a crack-time display. The crack time shown is the offline slow-hash scenario (10,000 guesses/second, like bcrypt) — real attacks vary widely, so treat every score as an estimate, not a guarantee. Everything runs client-side; your password never leaves your browser.

Examples

Common weak password

Status: ok — score 0 (Very weak), crack time "less than a second".

Strong passphrase

Status: ok — score 4 (Very strong), crack time "centuries".

Mixed password

Status: ok — score 4 (Strong), with suggestions if any pattern is detected.

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