 Another key aspect of the paperless office philosophy is the conversion of paper documents, photos, engineering plans, microfiche and all the other paper based systems to digital documents.Technologies that may be used for this include scanners, digital mail solutions, book copiers, wide format scanners (for engineering drawings), microfiche scanners, fax to PDF conversion, online post offices, multifunction printers and document management systems.Each of these technologies uses software that converts the raster formats (bitmaps) into other forms depending on need.