The reason why PDF format goes so viral these years greatly lies in its capability of killing all kinds of annoying problems when sharing and distributing files. A PDF file can bring you a document looks exactly as you expected, no matter how you are demanding on the fonts, formatting, images, tags, etc. Just for the reason of rich PDF elements, the size can be quite large. But in our work, we often need PDF in KB for convenient distribution across different channels, since large size PDF is really a big problem:
But no worry anymore, here you will be given the best solutions to reduce PDF file size on mac with or without Preivew
Cisdem PDF Compressor
Free Download macOS 10.15 or later
Preview is the free tool coming with MacOS to manage PDF files and images, you can utilize Preview to open, crop, print and edit supported files, also you can use Preview to reduce PDF file size on mac easily. Though it requires no installation and cost to shrink PDF on mac with Preview, it cannot batch process multiple PDFs file at the same time.
Follow the steps to Reduce PDF File Size on Mac with Preview.
Cisdem PDF Compressor is a dedicated and effective PDF file size reducer for Mac users, it provides four compression modes for users, including Minimal File Size (1 dpi images), Small File Size (72 dpi images), Medium File Size (150 dpi images), Large File Size (300 dpi images). Users can choose any mode according to their own needs to get the large size PDF in kb but still clearly on mac. Of course, the higher the dpi is, the clear the PDF will be.
Cisdem PDF Compressor is the best choice for Mac user due to its reasonable price and multiple compression modes. Besides, Cisdem provides a free trial for every user. So, just follow my steps to learn how to use it to reduce PDF file size on Mac.
Free Download macOS 10.15 or later 
Note: Cisdem PDF Compressor allows users to compress a 500-page PDF file within 1 minute.
If you have already installed Adobe on your mac, use this powerful tool to compress PDF easily on your mac.
For Mac users, there are also some free tips to reduce the pdf file size as following.
Delete---Remove Unnecessary Content
Quite a simple way. You can remove those unwanted objects like annotation, links, bookmarks, form fields, especially those unnecessary images. Even you can delete some pages with a nod from yourself.
Convert---Change to Word format
The Word format, Doc or Docx is a good file format to save and process information in compact size. You can convert the PDF to Word with Adobe(Open PDF in Adobe->Click "File" to "Save As"->Select "Microsoft Word" to choose Doc or Docx format as needed) or use a PDFtoWordConverter.
Zip---Compress with WinARA
Download the WinARA or any similar products to compress your PDF files and save in Zip format.
However, you should know these tricks help little when your PDF file is quite large and every part of your PDF is imperative.
Very often, we are not sure where and how to find a good solution to fix our problems. We may look it up online and get a bunch of advises to work on our problems, if we finally get an adequate way, the time and efforts on such things are worthwhile, but if we finally go nowhere, we just waste our time and efforts again. Sometimes, finding a competent expert critically shapes your solution to kill problems. So, if you are working seriously on a large PDF, if you need an expert for efficiency, try Cisdem PDF Compressor.
Carolyn has always been passionate about reading and writing, so she joined Cisdem as an editor as soon as she graduated from university. She focuses on writing how-to articles about PDF editing and conversion.
emma chow
Very detailed tutorials, different solutions for people with different tools in hand, great job on sharing experience.
Jamie
Thanks for sharing. I got an Adobe but now i am using the Cisdem PDF Compressor cuz it helps better.