Click "Reduce file size." The filter provided in ColorSync Utility reduces the scale of your PDF by 50% and restrict images to a maximum of 512 by 128 pixels. Click "Apply." Save your PDF.

How to Downsize a Large PDF to a Smaller JPEG File. Adobe Acrobat, the native application for creating and editing PDF files, contains many tools that can be used to modify PDFs. One of the things ...

Use Preview: Open the PDF in Preview, click File > Export, select “Reduce File Size” under Quartz Filter, and save. Use ColorSync Utility: Open the PDF in ColorSync Utility, click File ...

How to reduce PDF file size on a Mac computer with Preview 1. Open the PDF — if Preview isn't your default app, right click the PDF, then select Open with followed by Preview.