Alphanumeric Password Generator

An alphanumeric password generator creates passwords using only uppercase letters, lowercase letters, and numbers — no special characters. This is useful for systems that reject symbols or have character restrictions. Generated using cryptographic randomness in your browser.

    🔒 Passwords are generated in your browser and never transmitted to any server.

    When to use alphanumeric passwords

    Some systems only accept letters and numbers — certain banking platforms, legacy enterprise software, some government portals, and older routers. Alphanumeric passwords with a 62-character pool (26 uppercase + 26 lowercase + 10 digits) still achieve solid entropy: a 16-character alphanumeric password has ~95 bits of entropy — strong for virtually all use cases.

    Alphanumeric vs. full character set

    Removing symbols reduces entropy by about 9 bits at 16 characters compared to a full 94-character set. This is compensated by using slightly longer passwords: an 18-character alphanumeric password matches the entropy of a 16-character full-charset password. When the system allows symbols, always include them for maximum protection at the same length.

    Frequently Asked Questions

    Legacy systems, older databases, and some poorly-designed applications have character restrictions. Some systems fear that symbols might break SQL queries (a sign of poor security practices), while others have technical limitations in their authentication code. Modern systems should accept all printable ASCII characters.

    An alphanumeric password draws from 62 characters. At 16 characters, that's ~95 bits of entropy — considered strong. At 20 characters, ~119 bits — very strong. Use at least 16 characters when you cannot use symbols.

    We recommend at least 16 characters when restricted to alphanumeric. This compensates for the smaller character pool and achieves entropy comparable to a 14-character full-set password. For high-security accounts, use 20+ characters.

    A 16–20 character randomly generated alphanumeric password is secure for banking. The main risk is breach exposure and phishing, not brute force. Enable 2FA on all financial accounts regardless of password strength.