Alphanumeric characters are letters and numbers. In the usual English setting, that means A–Z, a–z, and 0–9.

Quick Scoop

If something asks for an alphanumeric value, it usually wants a mix of:

  • Letters : A to Z.
  • Digits : 0 to 9.

Examples

  • ABC123
  • a1b2c3
  • Password2026

Common use

Alphanumeric characters are often used in:

  • Passwords.
  • Usernames.
  • IDs and codes.
  • File names and data entry.

Small note

Some sources loosely include a few symbols like @ or #, but the strict, most common definition is just letters and digits.

If you want, I can also explain the difference between alphabetic , numeric , and alphanumeric in one simple table.