Why Do the File Sizes of PDFs Often Decrease after I Add a Few?

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Why do the file sizes of PDFs often decrease after I add a few annotations to them (with PDF XChange View)?

You can create PDF from single or multiple photos at a time. And the photos can be in different image formats. To create a PDF from a single photo, you can click the “Create PDF” button; If you want to create a PDF from multiple photos, you can click the “Combine PDF” button. Before saving the files into PDF, you can make the file size smaller by tweaking the image quality. To do this, go to the “File” menu and choose “Optimize > Custom”. Then you can customize image PDF, quality and more. For more details, you can read. How to Convert Photo to PDF

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Annotate PDF: All You Need to Know

It is not surprising to find that people have also been experimenting with PDF file shredding.