What is the ASCII code chart? Codes 0 to 31 are not used for characters They are called control characters because they are used for actions like: Carriage return (CR). Bell (BEL). Codes 65 to 90 ...

Many keyloggers would also not be able to log most of the characters from the ASCII code chart, which would render them useless.

Learn how to remove non-printable characters in Excel. The first 32 characters in the ASCII character table are non-printable characters.