Reducing PDF Size
“Why is this PDF so large?” is a common question, and it can often be difficult to understand what is taking up space in a PDF.
Audit Space Usage
The Audit Space Usage tool in Adobe Acrobat is extremely useful in helping you understand which components of your PDF are contributing to the file size.
It can be found via File > Save as… > Optimized > Audit space usage…
In the scenario above, you can see that the PDF contains about 40 MB of images, and all the remaining metadata is negligible.
Reducing PDF Size with Acrobat
Adobe Acrobat comes with a feature called PDF Optimizer which provides many settings for reducing the size of PDF files.