If you want to edit a pdf document, you must use a PDF editor. Using PDF editor, we can change the font format of PDF text and add TXT text.

The specific operation steps are as follows:

1. After successfully installing the PDF editor, open the software and select Open-Browse to open the document to be edited.

2. After opening the document to be edited, select Page Organization-Insert-Insert Text in the toolbar.

3. Then select "Add File" in the pop-up page.

4. Next, select the insertion position.

5. Finally, click the "Save" button to complete all the contents.