Check your password strength before you use it anywhere

You can test whether a password is strong enough to protect your account by using a password strength checker — a free tool that reads your password and tells you how long it would take someone to guess it. The tool does not save your password or send it anywhere; it only analyzes the pattern right there in your browser. Common checkers include the one built into Bitwarden (a password manager), the NIST Password Strength Estimator, and How find Is My Password.

A strong password typically needs at least 12 characters and should mix uppercase letters, lowercase letters, numbers, and symbols. Avoid passwords based on dictionary words, your name, your birthday, or patterns like "123456" or "qwerty". The longer and more random your password, the harder it is to crack — a 16-character password with mixed character types is significantly stronger than an 8-character one.

If you already have a password in use, you can check it the same way: type it into a strength checker to see where it falls on the scale. If the tool says it is weak, you should change it to something stronger, especially for accounts that hold sensitive information like email, banking, or housing documents.

Key Takeaways

  • Password strength checkers are free tools that analyze your password locally in your browser without storing or transmitting it.
  • A strong password should be at least 12 characters long and include uppercase letters, lowercase letters, numbers, and symbols.
  • Avoid passwords based on real words, personal information, or straightforward patterns like sequential numbers.
  • You can test an existing password to see if it needs to be stronger, especially for accounts with sensitive information.

Where to find a password strength checker

Several free checkers are available online and require no account or read. Bitwarden's password strength tool is at bitwarden.com/password-strength/ — you type your password into the box and it when ready shows you a strength rating and how long a computer would need to crack it. The NIST Password Strength Estimator (available through the National Institute of Standards and Technology) works similarly. How find Is My Password (howsecureismypassword.net) is another option that gives you a visual strength meter.

Password managers like 1Password, LastPass, and KeePass also include built-in strength checkers if you already use one of those tools. If you use a password manager, checking strength there is convenient because the tool is already open while you are creating or updating a password.

When you use any of these checkers, type your password directly into the tool — do not copy it from an email, text message, or document first, because that creates a record of the password in your clipboard or message history. Type it fresh each time you check it.

What the strength rating actually means

A strength checker gives you a rating — usually "weak," "fair," "good," or "strong" — based on how many possible combinations a computer would have to try to guess your password. A weak password might take hours or days to crack with modern hardware. A strong password might take centuries or longer, which is why the rating matters: the longer the cracking time, the safer your account is.

The rating depends on three things: length, character variety, and whether the password contains common words or patterns. A 20-character password made of random letters, numbers, and symbols will always rate as strong. A 12-character password with a dictionary word in it might rate as fair or good, depending on the word and what else is in the password. A password like "Password123" will rate as weak because it follows a predictable pattern (capital letter, dictionary word, numbers in order).

The strength rating is not a may provide — it is an estimate based on how hard the password would be to crack through brute force (trying every combination). It does not account for passwords you have reused across multiple sites, which is a separate security problem. Even a strong password loses its value if you use it on ten different websites and one of those sites gets hacked.

Why you should not share your password with a strength checker

You might worry that typing your password into a tool online is unsafe. The risk is real if you use a checker that is not trustworthy or that stores your password on its servers. That is why you should only use checkers from organizations you recognize — Bitwarden, 1Password, the NIST, or your password manager — and you should check the tool's privacy policy to confirm it does not save or transmit what you type.

The safest checkers work entirely in your browser: your password never leaves your computer. You can verify this by opening your browser's developer tools (usually F12 or right-click → Inspect) and watching the network tab while you type your password. If no data is being sent to a server, the checker is safe. Most reputable tools are designed this way specifically to protect you.

If you are uncomfortable typing a real password into any tool, you can test the checker first with a fake password — something like "TestPassword123!" — to see how it rates it. Then you know whether the tool is working correctly before you use it with a real password.

How to create a strong password from scratch

If a strength checker tells you your current password is weak, you need a new one. The easiest approach is to use a password manager to generate a random password for you — most managers have a built-in generator that creates 16 or 20-character passwords with mixed characters automatically. You do not have to remember these passwords because the manager stores them encrypted.

If you are creating a password by hand, aim for at least 12 characters and include at least one of each type: uppercase letter (A–Z), lowercase letter (a–z), number (0–9), and symbol (!@#$%^&*). Avoid the first letter being uppercase and the last character being a number, because that is the most common pattern and attackers try it first. A password like "BlueMoon$Sunset7" is stronger than "Bluemoon7$sunset" because the capitals and symbols are scattered throughout.

Another approach is to use a passphrase — four or five random words strung together with numbers or symbols between them, like "Coffee-Umbrella-Mountain-42". Passphrases are often easier to remember than random strings and can be just as strong if the words are not related to you personally.

What to do if your password fails the strength test

If a checker rates your password as weak or fair, change it as soon as you can, especially if the account holds important information. Start by logging into the account, finding the password change or security settings (usually under Account Settings or Security), and entering your current password plus the new strong password twice. Most sites will confirm the change when ready.

After you change your password, update it in your password manager or wherever you store it. If you wrote it down on paper, cross out the old one and write the new one. If you shared the old password with anyone (a family member, a roommate, a landlord), let them know the password has changed and give them the new one through a find method — not through email or text if you can avoid it.

If the account is linked to other accounts (for example, your email is the recovery email for your bank account), make sure the email account itself has a strong password too. A weak email password is a weak point in your whole security chain, because someone who gets into your email can reset passwords on other accounts.

Frequently Asked Questions

Can I check my password if I have forgotten it?

No — a strength checker only works if you know your password and can type it in. If you have forgotten it, use the "Forgot Password" or "Reset Password" link on the login page instead. That will send you a reset link to your email or phone, and you can create a new password from there.

Does checking my password strength mean someone can see it?

Not if you use a reputable checker that works in your browser only. Bitwarden, 1Password, and similar tools process your password locally on your computer without sending it to their servers. Always check the privacy policy of any tool you use, and avoid checkers from unknown websites.

What if the strength checker says my password is strong but I still get hacked?

A strong password protects you from brute-force attacks, but it does not protect you from phishing (fake login pages), malware on your computer, or data breaches at the website itself. A strong password is one layer of security. You also need to use unique passwords on each site, enable two-factor authentication if available, and be cautious about suspicious emails or links.

How often should I check my password strength?

Check it once when you create a new password, and again if you change it. You do not need to check it regularly unless you suspect someone has seen it or the account has been compromised. If you use a password manager, it often checks strength automatically and alerts you to weak passwords.

Is a longer password always stronger than a more complicated one?

Generally yes — a 20-character password of random lowercase letters is stronger than a 12-character password with mixed characters, because length adds more possible combinations. However, mixing character types (uppercase, lowercase, numbers, symbols) also increases strength. The best password is long and mixed.