The DocHub editor enables you to quickly Collate PDF in Preview. It’s easy to understand and requires no previous experience with similar editing solutions. Simply add your file, and DocHub will handle everything else, giving you things like:
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To combine multiple PDFs into one document on your Mac, locate the PDFs you want to merge and open them all. Select all the PDFs, then go to File > Print and choose "Save as PDF." Select the desired name and location, then click Save. This will combine all pages into a single new PDF file.