Some may need to convert some text into HTML and some may need to convert some HTML content to an image format. The main reason for the need to convert from one file format to another is because the target file format is best suited for targeted medium where the content need to be displayed. The targeted medium may be an email, a printed hard copy or a web browser. The text format is best suited for sending emails, as the possibility of the email contents getting corrupted in the transition is much lesser, when compared to the HTML formatted emails. PDF document or a word document would be the best choice for taking a printed hard copy and obviously HTML is best for showing contents in web browsers.