Weak passwords are a common cause of account compromise. Birthdays, phone numbers, sequential digits, or reusing one password across multiple sites can be exposed through credential stuffing and brute-force attacks. This tool makes strong password generation simple: choose the desired length, select the character types, and generate a password instantly. The strength level and security analysis are displayed at the same time. Password generation and checking are performed entirely in the browser, and nothing is uploaded to the server.
The length can be adjusted from 4 to 128 characters, with 20 characters as the default. Each additional character roughly doubles the number of combinations that a brute-force attack needs to try, so 16 characters or more is a more robust choice. Four character groups are available: lowercase letters, uppercase letters, numbers, and special symbols. All are selected by default. A larger character set makes the password harder to guess. Enable “Exclude ambiguous characters” to remove 0, O, 1, l, and I, which can look similar in some fonts and are easy to confuse when copied or read aloud. Every selected character group is guaranteed to appear at least once.
Each generated password receives a real-time strength level: Weak, Fair, Strong, or Very Strong. The level is estimated from information entropy based on password length and character-set size. The security checks show whether the password exceeds 16 characters, contains both uppercase and lowercase letters, contains numbers, and contains special symbols. If a check fails, increase the length or add the missing character type and generate again. Quick length options of 8, 12, 16, 20, 32, and 64 characters are also available next to the length slider.
When setting passwords for multiple accounts, choose 1, 5, 10, or 50 to generate a batch of different passwords at once. Each password can be copied individually, or the entire batch can be copied with one click, with one password per line for easy import into a password manager or spreadsheet. The main result area provides Copy Password, Regenerate, and Clear buttons. Changing any option immediately generates a new result.
The page uses the browser’s cryptographically secure random number interface crypto.getRandomValues() and applies rejection sampling to avoid modulo bias. This gives each character a uniform selection probability. Math.random() is a non-cryptographic random number generator and is not suitable for password generation, so this tool does not use it. The character order is also shuffled after generation with the same secure random source, preventing selected characters from consistently appearing at the beginning.
This tool has no server-side processing. Passwords are generated in the page and strength evaluation is also performed locally. Passwords are not sent to or stored on the server, and generated results are not written to browser storage. Closing or refreshing the page clears the current password and batch results. For long-term storage, use a password manager rather than chat history, notes, or browser bookmarks.
Use a different password for every website so that one breach does not expose multiple accounts. Prefer passwords of 16 characters or more that include numbers and symbols. Store generated passwords in a password manager instead of sending them through chat or email. Enable two-factor authentication on important accounts to add another layer of protection if a password is exposed. If a website limits password length or does not allow special symbols, use the maximum permitted length while retaining uppercase, lowercase, and numbers.
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