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A document scanner is a device that allows you to convert a written or printed document into digital form. Every type of document scanner will be able to digitize photos or documents at the every least, although there are certain more specialized units on the market. There are even document scanners that are intended primarily for business cards. Choosing a document scanner is largely dependent upon many factors, not the least of which is image resolution. If you plan to use your document scanner mainly for filing text or less sensitive graphic documents, you can make do with a document scanner that has a resolution of 600 dpi or less.