Wait. What do you mean "with url inserted"? Are you talking about a complete document, or a list of strings that you want to convert into appropriately formatted links?
The quick-and-dirty way to convert a plain-text document into html is to globally replace all multiple line breaks with </p>\n\n<p> and then do some manual spot-cleaning. (Been there. Done that.) If you are not already reasonably comfortable with Regular Expressions, this is the time to learn.
@Romer 1- Change the Extention of page from txt to html. 2- Add <br /> to the place you want to start new line. 3- Now you may double click to the file and access your html file. 4- If you want to show it online you need domain name and hosting server.( Which need severel things to be learned! )