Analyze space usage with the audit option. You will get the total size of the PDF file as well as the number of bytes used for fonts, bookmarks, images, forms, and other specific document elements. All information is given in bytes. Plus, you get a percentage of the total file size.How to perform an audit:The first way is to open the File tab and choose Save As Other. Then select Optimized PDF. Alternatively, you Go to Tools and select Optimize PDF, and then choose Advanced Optimization. After that, you’ll see a PDF Optimizer dialog box.Go to the top of the dialog box and find the Audit Space Usage button, click it.