Why Splitting Does Not Always Reduce File Size? If a PDF file is mostly composed of content streams (text) and has no embedded fonts or images, then splitting such file into multiple documents produces files with sizes that are proportional to number of pages. The example below shows that 53% of the file size are taken by fonts, while only 23% are occupied by actual document text. Press "Audit Space Usage." button to display distribution of the file size among various file components. Open a PDF document and select "File > Save As Other > Optimized PDF." from Acrobat menu. Auditing PDF File Size The Adobe Acrobat provides excellent function for inspecting PDF file structure. The higher is image resolution, the more space images will take. The image resolution (image dimension in pixels) is also crucial.
Color images take up more space than monochrome or grayscale images.
The resolution and bit-depth of images greatly affects overall file size. The second reason is using images for creating PDF file. It is recommended to avoid using Adobe Acrobat to directly editing text in PDF documents. Adding a single font to a PDF document may increase file size by 400-600KB. Fonts can be subsetted and embedded right into PDF file. The first reason is that one or more fonts are stored inside PDF document. Causes of File Size Increase Typically, there are two major reasons why PDF file size can be "disproportionally" large. This means that number of pages cannot be used to measure how large or small a specific PDF file should be. Depending on internal file structure, content streams might occupy just a small percentage of the overall file size or almost an entire document. PDF File Size and Number of Pages The only part of the PDF file that is proportional in size to number of pages is "content streams".
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