Meet URL Decode and Encode, a simple online tool that does exactly what it says: decodes from URL-encoding as well as encodes into it quickly and easily. URL-encode your data without hassles or decode it into a human-readable format.
URL-encoding, also known as "percent-encoding", is a mechanism for encoding information in a Uniform Resource Identifier (URI). Although it is known as URL-encoding it is, in fact, used more generally within the main Uniform Resource Identifier (URI) set, which includes both Uniform Resource Locator (URL) and Uniform Resource Name (URN). As such it is also used in the preparation of data of the "application/x-www-form-urlencoded" media type, as is often employed in the submission of HTML form data in HTTP requests.