Url Encoding

Some error messages

What is Url Decoding?

URL decoding, also known as percent-decoding, is the process of converting URL-encoded characters back to their original form in a URL or URI.

In a URL, certain characters are reserved for special purposes, such as delimiters or indicators. For example, the characters "/", "?", "&", "=", and "#" have special meanings in URLs. To include these characters in a URL for their literal meaning, or to include characters that cannot be represented directly in a URL, such as non-ASCII characters, they are URL-encoded.

URL encoding replaces non-alphanumeric characters with a percent sign "%" followed by two hexadecimal digits representing the ASCII code of the character. For instance:

  • The space character " " is encoded as "%20".
  • The plus sign "+" is also often used to represent space characters, particularly in query strings.

URL decoding reverses this process by replacing each percent-encoded sequence with its corresponding character. For example:

  • "%20" is decoded back to a space character " ".
  • "+" is decoded back to a space character " ".