You can use this tool for free especially when you are adding special characters to a URL parameter. This tool decodes or encodes a URLs so it becomes RFC 1738 compliant. Only the characters that don't go by the standards are replaced by a % character and addtional two hexadecimal values. The tool is 100% free to use to decode and encode URLs.
Enter the text that you wish to encode or decode:
To decode/encode, simple enter the string of text and click on "Submit" to view the results.