The ENCODEURL function returns a URL-encoded string composed of US-ASCII characters. URL encoding, sometimes called "percent encoding" is a method of encoding characters in a URL using only legal US-ASCII characters. Some characters cannot be part of a URL and are "reserved". Only characters that are reserved are encoded by ENCODEURL; other characters are left untouched. Common reserved characters include the space character (" "), the forward slash "/", the hash character (#) and others as shown in the example above.
To use ENCODEURL, supply text or a cell reference that contains text. In the example below, ENCODEURL is used to encode the text "Hello World!"