How many ASCII control characters are there?

There are 33: the 32 codes from 0 to 31 (the C0 control set) plus DEL at 127. They are non-printing characters that control devices and data streams rather than displaying a glyph.

What is the difference between CR and LF?

Carriage return (CR, 13, \r) returns the cursor to the start of the line, while line feed (LF, 10, \n) moves down one line. Unix uses LF for newlines, classic Mac used CR, and Windows uses CR LF together.

Is anything I search uploaded?

No. The full list of control codes and the search both run entirely in your browser. Nothing you type is sent anywhere.

ASCII Control Codes Reference

The 33 ASCII control characters — abbr, caret and escape.

ASCII control codes reference

The 33 ASCII control characters — codes 0–31 (the C0 control set) plus DEL (127) — each with its decimal and hex value, abbreviation, caret notation, escape sequence and a plain-English description of what it does.

These characters are non-printing: they direct terminals, printers and data streams rather than rendering a glyph. Search by decimal, abbreviation, name or escape sequence. Everything runs in your browser; nothing is uploaded.