How to use the password strength checker
- Type a password — the strength bar, rating and estimated crack time update as you type.
- Read the tips to see exactly what would make it stronger.
- Nothing you type leaves your device, so it's safe to test a password you actually use.
What makes a password strong
Strength comes mostly from length and unpredictability. A long passphrase of random words beats a short password with a few symbols, because every extra character multiplies the number of guesses an attacker needs. Mixing upper and lower case, numbers and symbols widens the pool per character, but avoiding common words, names, dates and keyboard patterns (like "qwerty" or "123456") matters just as much — attackers try those first.
Benefits
- Rates a password and estimates how long it would take to crack.
- Gives specific, actionable tips to make it stronger.
- Flags common passwords, sequences and repeats that attackers try first.
- Fully private — the password is analysed in your browser and never uploaded.
Limitations to know
- The crack-time figure is an estimate, not a guarantee.
- It checks structure and common patterns, not whether a password has appeared in a specific breach.
- A strong score still requires you to use the password on only one account.
Common mistakes to avoid
- Relying on a few symbols instead of length — a long passphrase is stronger.
- Reusing even a strong password across multiple accounts.
- Basing a password on a name, birthday or dictionary word that guessers target first.
Alternatives
To create a strong random password use the Password Generator; for random identifiers use the UUID Generator.
Last updated: August 2026 · Reviewed by the AI Toolbox editorial team.
Frequently asked questions
Is it safe to type my real password here?
Yes — the check runs entirely in your browser with JavaScript. Your password is never sent over the internet, stored, or logged.
How is crack time estimated?
From the size of the character set and the length, assuming a fast offline guessing attack. It's a rough guide, not a guarantee.
What's the best kind of password?
A long, unique passphrase — several random words — stored in a password manager, with a different password for every account.
Do symbols really help?
They help by widening the character set, but length helps more. A long passphrase without symbols can beat a short complex one.