 Web-to-print increasingly calls for a Portable Document Format (PDF) workflow environment with output provided by digital printing; although there is certainly no requirement that fulfillment be accomplished using digital production equipment; web-to-print is also used today by printers with both offset and digital production facilities.Prepress reviews can be done online, allowing a print house, a client, and possibly a graphic designer to create, edit, and approve computer-based online artwork.Some web-to-print sites offer online print products that replace editing tools like Adobe InDesign where buyers can author work and alter the typeface, copy, images, and layout.