Above free online tool helps to encode or decode the string. Basically, it is used for URL Encoding where characters outside the ASCII set is converted into a valid ASCII format. This URL Encoding process does two things at the time of encoding.
For example given string:
@codex world, would be encoded as:
URL Encoding also known as Percent-encoding, convert characters into a format that can be transmitted over the internet. URL Encoding basically used within the main Uniform Resource Identifier (URI) which include both Uniform Resource Locator (URL) and Uniform Resource Name (URN).
In URL Encoding, all non-alphanumeric character except -_. have been replaced with a percent (%) sign followed by two hex digits and spaces encoded as plus (+) sign.
When the URL contain a character from the Reserved Character, then the character must be encoded. It is necessary and you should always encode any special characters found in URL.
The reserved characters and after encoding value is given below.
!(Exclamation mark) becomes
#(Number sign) becomes
$(Dollar sign) becomes
+(Plus sign) becomes
=(Equals sign) becomes
?(Question mark) becomes
@(At sign) becomes
[(Square brackets) becomes
](Square brackets) becomes