You can use PDF to add text tools, which can be found on the fast PDF converter online platform, and the operation is very simple.

1. After entering the online platform of PDF converter, find the document processing in the navigation bar, and then find the PDF Add Text tool to open it.

2. After opening the tool, we will open the PDF file to add text in the tool, and enter the text and page number to add in the custom settings at the bottom of the interface.

3. Click Start Processing, wait a few seconds, and the PDF will successfully add text.