How does Apple compress the pdf file size?

How Apple compresses the pdf file size can be solved as follows:

1. First, right-click the PDF file to be compressed, and select PDF-XChange Viewer from "Open with".

2. Select "Export to Image …" under "File" and "Export".

3. Select JPEG image in the pop-up dialog box, set the path and compression resolution, and click "Export".

4. Select all the pictures you exported from the PDF, right-click them and select Print.

5. Select the Printer as TinyPDF, and then click Print.

6. Start saving as PDF, and wait a moment.

7. Looking at the compressed PDF, you can see that it has become much smaller.

This is how Apple computers compress the size of pdf files.