Method 1 – Zip
How do I make a PDF slightly smaller without third party software? Well, the build in zip function in Windows has the ability to shrink a pdf by 10 – 15% of the original size.
Method 2 – Use Adobe Acrobat PDF Optimizer
This feature is only available in Adobe Acrobat Professional version, with the advanced ‘optimizer’ feature. You’re able to remove unwanted data, compress jpeg and many more.
Method 3 – PDF Shrink
Perhaps a 3rd party software is the best answer, VeryPDF PDF Shrinker Software (Advanced PDF Tools) is a fast and easy to use utility to maintain your PDF files, it allows you to edit or add data into the document information fields of single or multiple PDF files, it also allows you to set open action, page layout, page size, page margin, page orientation, metadata, and others into your existing PDF files.
Method 4 – Online PDF Optimization
PDF Tools is a free online tools that enables you to optimize your PDF with many settings to choose from.