1. Search for speedpdf. After finding and opening the homepage of this online conversion tool, first select PDF to Word in the page;

2. Upload a PDF document according to the page prompts, and click Convert to start conversion. After the conversion is completed, PDF documents can be downloaded quickly.

Second, make a document structure diagram for the Word document.

1. Open the Word document converted in the previous step, find the outline view option at the lower right, and click to enter the outline mode;

2. Position the mouse cursor to the title position where the structure diagram needs to be set in turn, and then find the ordinary text option in the outline option in the upper left menu bar, and set it to different levels according to the content.

Third, export Word to PDF.

After the document structure diagram is completed, click "Export" in the file tab in the upper left corner to export Word in PDF format and save it;

Open the PDF file again, click "Contents" to display the same document structure diagram as in Word on the left panel, and click to jump to the corresponding page;