The DocHub editor enables you to easily Shrink PDF file size in Preview. It’s easy to understand and requires no previous experience with similar editing tools. Simply add your file, and DocHub will handle everything else, providing you with things like:
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Gary from MacMost.com shows several methods to compress PDF files on a Mac. You can open the PDF in Preview and export it with image compression, but this method may not offer the best results. Instead, he demonstrates how to create a custom compression using Automator to quickly reduce file size and customize settings. As an example, he uses a scanned electric bill and shows how to check the file size before opening it in Preview for compression.