PDF as a Document Format
If you've been around much on the Internet, you'll be easily familiar with this little 3-letter file type, and may wonder how to reduce PDF file size. PDF, which stands for "Portable Document File," is by far the most widely-used format for any number of things, ranging from non-editable text documents to brochures to images, and everything in between. These files are also pretty easy to make, either with Adobe's official software, or with a number of other free ones. You can create them from text documents, or scan in images to turn your paper documents into electronic ones.
How to Reduce PDF File Size with Images
Images can make a file very large very quickly. If you're considering adding them to a PDF file, you will want to know how to reduce PDF file size with them. If you are scanning your images, make sure to use a low DPI in image creation. High DPIs are not needed for everyday purposes, and will vastly increase the size of the final PDF. How to reduce PDF file size with images is easy for existing files too: just make sure you save them with maximum compression using whichever graphics editing software you prefer to use.
How to Reduce PDF File Size with Text
The big factor in PDF size when creating text-only documents is the fonts. Although fonts can lend your document a great deal of individuality or charm, don't go overboard. If at all possible, don't embed any fonts at all: this is key to how to reduce PDF file sizes in text-only documents. This isn't reasonable in most cases, but regardless of which fonts you use, try to make sure most of them are widely-available and only use a few that have to be embedded because they aren't already on people's computers.