Some time as a developer you need to encode or decode url for your purpose.
See example of encoded url:
https%3A%2F%2Fwww.google.co.in%2F%3Fgfe_rd%3Dcr%26ei%3DvUsXV572BuXI8Afb-Iv4BA%26gws_rd%3Dssl
Now you want to check what is the argument in above url. Now you need to decode it. click on below link. This is a online tool for encoding or decoding any type of url.
Paste encoded url in textbox and click on decode button. It will replace decoded url in text area.
See the example of decoded url
https://www.google.co.in/?gfe_rd=cr&ei=vUsXV572BuXI8Afb-Iv4BA&gws_rd=ssl
You can encode or decode any type of url here.