How to minimize pdf file size on mac without losing quality?

You can absolutely use ColorSync Utility to minimize PDF file size Mac. The key is to create a custom Quartz filter. The default "Reduce File Size" filter prioritizes a small file over quality, often resulting in a blurry document. By creating your own filter, you can adjust the settings to find a better balance.

Here's the step-by-step process:

1. Create a Custom Filter: Open ColorSync Utility (found in /Applications/Utilities/). Click the Filters tab. Find the "Reduce File Size" filter, click the small arrow next to it, and select Duplicate Filter.

2. Configure the New Filter: You'll now have a filter named "Reduce File Size copy" at the bottom of the list. Click the arrow next to it to expand its settings. This is where you control the quality.

• Under Image Sampling, set Quality to High and change the Set Resolution value. A resolution of 150 DPI is often a good starting point for documents meant for screen viewing, while 72 DPI creates a much smaller file for web use.
• Under Image Compression, set the Mode to JPEG and the quality to Max to preserve image detail.

3. Apply the Filter to Your PDF: With your custom filter created, you can apply it in two ways:

• In ColorSync Utility: Open your PDF (File > Open), choose your new custom filter from the dropdown menu at the bottom of the window, and click Apply.
• In Preview: Open your PDF in Preview. Go to File > Export..., choose PDF as the format, and select your new custom filter from the Quartz Filter dropdown menu before saving.

By following these steps, you can effectively minimize PDF file size Mac using only the built-in ColorSync Utility. It's a powerful method that is both free and customizable, allowing you to achieve a balance between file size and image quality that best suits your needs.