Digital copiers have largely replaced analog photocopy machines as standard office equipment throughout the world. The advanced technology is better for the environment than the old machines, and may also be easier to maintain and repair. By combining the functions of a document scanner and a laser printer, the digital copier revolutionized the field of photocopying.

Traditional, or analog, copiers work by combining a positively charged drum and negatively charged substance called toner to recreate the image of the original document on a new piece of paper. To create additional copies, analog machines would have to recopy the original each time. Digital copiers work like a computer document scanner; they stores the data as a file that can then be reprinted repeatedly, altered, or saved.

The printing mechanism of digital copiers acts like a modern laser printer. The printer quickly memorizes the entire document scanned through a Raster Image Processor (RIP) and creates the page in the raster memory. Through lenses and mirrors, a laser imprints a piece of paper with the image, which is then made visible through toner with an opposite charge.

One of the benefits of digital copiers is the ability to create multiple sets of copies from one scan. If you need 5 copies of a packet of 5 papers, you will only need to run the original through once and the copier will produce the copies freely. While on small jobs this may not seem like a timesaver, when you are making 100 or 1000 copies, it enables you to walk away from the copier and work on other things while it cheerfully copies for you.

Image quality is usually considerably higher on a digital copier than an analog model. Because of the scanning technology used, duplicates can be indistinguishable from the originals. If the original is not clear or not vivid enough, digital copiers also allow you to change the intensity and saturation for the copies, so your duplicates may actually look better than the original document.

Nearly all copiers on the market currently use digital technology. Their advanced capabilities make them faster, quieter, and less time consuming to use or set up than traditional versions. Business models of digital copiers begin at about $1500 US dollars (USD) for a basic model, and can cost up to $100,000 USD for an extremely advanced machine.

Almost all major copy machine makers use digital technology exclusively. Canon, HP and CopyCentre all offer several versions to meet your needs. Consider the needs of your business or enterprise carefully when choosing which digital copier to buy. It may be one of the most useful machines in your entire operation, and your administrative assistants may despise you if you skimp on a copier.