Strong Password Generator
Create strong, truly random passwords with the Web Crypto API. Pick the length and character sets, exclude characters a site rejects or that look alike, generate several at once, and see exactly how strong each one is in bits of entropy.
Set the length (16–24 characters is a good default), choose lowercase, uppercase, numbers and symbols, and the generator creates passwords with crypto.getRandomValues — the same cryptographically secure randomness browsers use for encryption keys. It shows the entropy in bits and the estimated time to guess it. Nothing leaves your device.
89 possible characters × 20 = 130 bits of entropy. Guessing it at 100 billion tries per second would take about centuries+.
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How to use Strong Password Generator
- 1Choose a length — at least 16 characters for important accounts.
- 2Select the character types, and optionally avoid look-alike characters.
- 3Exclude any characters a website doesn't accept.
- 4Copy a password and save it in your password manager.
What makes a password strong
Length and randomness. A password's strength is the number of guesses an attacker needs, which grows exponentially with length. A random 16-character password from all 94 printable characters has about 105 bits of entropy — far beyond any brute-force attack — while an 8-character one can fall in hours to a fast offline attack.
Humans are bad at randomness: we pick words, names, dates and keyboard patterns that attackers try first. A generator removes that bias, so every character is equally likely.
Use a password manager
The strongest password is useless if it's reused. Generate a different password for every account and store them in a password manager, then protect that with a long passphrase and two-factor authentication. Check any existing password with the Password Strength Checker, or create memorable ones with the Passphrase Generator.
Frequently Asked Questions
How long should my password be?
At least 12 characters for everyday accounts and 16 or more for email, banking and your password manager. NIST guidance favours length over complexity rules.
Are the passwords really random?
Yes. They use crypto.getRandomValues with rejection sampling, so every character is picked uniformly from your chosen set, without the bias of Math.random.
Why avoid ambiguous characters?
Characters like l, 1, I, O and 0 are easy to misread when typing a password from paper or another screen. Excluding them costs very little strength.
Is my data sent to your server?
No. This tool runs entirely in your browser using the Web Crypto API and JavaScript. Nothing you type or generate is uploaded, logged or stored.
Guides & Tutorials
Related Tools
Password Strength Checker
Test how strong your password really is, how long it takes to crack, and whether it's been breached.
Passphrase Generator
Create strong, memorable passphrases from random words (EFF diceware list).
Password Entropy Calculator
Calculate password entropy in bits — the naive formula and a realistic, pattern-aware estimate.