what is alphanumeric characters

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.