This tool will help you to insert some URL into another as parameter. Inserted URL must be Encoded! It`s very useful for web designers.
For example: You should to insert: www.hard-soft.rs/action.php?affiliate=kostunica&country=dembelija&future=dark as URL parameter into following link: www.download4you.com/do.php?print=y&confirm=y&anything=n&url=...
Result is: www.download4you.com/do.php?print=y&confirm=y&anything=n&url=www%2Ehard%2Dsoft%2Eco%2Eyu%2Faction%2Ephp%3Faffiliate%3Dkostunica%26country%3Ddembelija%26future%3Ddark and this is correct way.
If you try to insert URL into another URL without encoding you will lose parameters.