Make sure the images are black and white and not color. Saving as colorīecause most scanned objects are text-only documents, they do not need to be in color. However, for a PDF that is for screen reading, the DPI should be 72. By default, most scanners record images at 300 DPI, which is the minimum DPI for any image that is printed after scanned. The dots per inch ( DPI) of the scanned image is often the primary cause of a large PDF file. Most e-mail services don't allow attached files larger than 3 to 5 MB. Most users notice the PDF is too large when they try sending the PDF in e-mail and realize it exceeds the allowable size. Below are the most common causes for a scanned document to be too big in size when saved as a PDF file.
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