Free strong password generator
Generate a strong random password with adjustable length, uppercase, lowercase, numbers, and symbols. Secure randomness runs privately in your browser.
- Format
- Free browser tool
- Updated
- Updated
Generated on this device
Create a strong random password
Need a unique password for a new account? Choose the length and character groups, then save the locally generated result in your password manager.
No account · No password sent · No password stored
How to use the password generator
- Keep the default length of 20 characters, or choose the longest value accepted by the service.
- Leave uppercase, lowercase, numbers, and symbols enabled unless the service rejects one of those groups.
- Copy the generated password and save it directly in a trusted password manager.
- Use it for one account only. Enable multi-factor authentication or a passkey when the service supports one.
The password changes when you adjust a setting or select “Generate another.” Bitfoo does not offer an account or vault for these values, so save the password before leaving the page.
How this password generator works
The tool uses the browser Web Crypto API, which provides random values suitable for cryptographic use. It does not use Math.random(), download a word list, call a password API, or send the generated value to Bitfoo.
Each character is selected with rejection sampling so every position draws fairly from the available character pool instead of introducing modulo bias. A candidate is accepted only when it contains every character group you selected. Everything happens in the current page, and the value is cleared when you clear it, replace it, or leave the page.
The symbols option uses this exact set: !@#$%^&*()-_=+[]{};:,.?. Disable symbols only when a service documents a narrower character policy.
How long should a random password be?
Longer is generally safer, provided the password remains unique and private. Current NIST password guidance requires at least 15 characters when a password is the only authentication factor and permits a lower minimum when it is part of multi-factor authentication. This generator defaults to 20 characters so most people start above that baseline.
| Length | Practical guidance | When to use it |
|---|---|---|
| 8–11 characters | Short by current standards, even when randomly generated | Only when an older service imposes a restrictive maximum |
| 12–14 characters | Better, but below the current single-factor baseline | Compatibility-constrained accounts that also use MFA |
| 15–19 characters | A strong practical range for a unique random password | Accounts with moderate password-length limits |
| 20–32 characters | The recommended default range for this generator | Important accounts and password-manager storage |
| 33–128 characters | Useful where very long credentials are accepted and manageable | Specialized systems, service credentials, and strict internal policies |
The tool permits 8 characters only for compatibility with restrictive legacy services; it is not the recommended default. The strength label is a practical estimate for the randomly generated value, not a promise that an account cannot be compromised. Password storage, phishing resistance, malware protection, recovery controls, and the service's own defenses still matter.
Can you trust an online password generator?
You should ask that question before placing any important secret in a webpage. This tool is designed to minimize trust: the source is a static page, generation happens locally, no password is sent to an API, and analytics events contain only non-secret settings such as length and number of enabled character groups.
That does not make the surrounding device automatically trustworthy. A malicious browser extension, keylogger, compromised operating system, altered website, screen recording, or unsafe clipboard manager could still expose a password. Confirm that the address is https://bit.foo/tools/password-generator and that the connection is secure. If your threat model includes a compromised browser or device, do not use a browser-based generator on that device.
For especially consequential secrets—including a password-manager master password, recovery key, encryption key, or cryptocurrency wallet—use a trusted, independently reviewed password manager or audited offline generator. No generator replaces unique passwords, secure storage, MFA or passkeys, and careful phishing checks. The OWASP Authentication Cheat Sheet and NIST guidance both emphasize long passwords, password-manager compatibility, and layered authentication practices.
Common password generator questions
Does Bitfoo see or save the generated password?
No. The generator runs locally in the browser, and the password is not sent to Bitfoo, placed in the page URL, written to browser storage, or included in analytics. It remains visible to the current page and device until it is cleared, replaced, or the page is closed.
Is the password truly random?
The browser supplies cryptographically strong pseudorandom values through Web Crypto. That is the appropriate browser facility for this purpose. “Cryptographically strong” does not mean a physical source of perfect randomness or a guarantee against every possible compromise.
Why does the tool guarantee every selected character group?
Some services require at least one uppercase letter, lowercase letter, number, or symbol. The generator creates secure random candidates until one satisfies every group you selected, without forcing characters into predictable positions.
What if a website rejects the generated password?
Some older services impose short limits or reject certain symbols. Follow the service's stated requirements, disable only the incompatible group, and keep the password as long as the service permits. A site's restrictive rules do not make a shorter password equally strong.
Should I use a password manager?
Yes, for most people. A password manager makes it practical to use a different long random password for every account. Protect the manager itself with a carefully chosen master passphrase and multi-factor authentication when available.
Should I change strong passwords on a schedule?
Change a password when it is exposed, reused, shared inappropriately, or there is evidence of compromise. Current NIST guidance does not recommend arbitrary periodic password changes without evidence of compromise.
Continue improving account and website security
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Recovery guideRecover from a website compromise
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