The unclear conversion of pictures into PDF is caused by the problem of the tools used, which can be solved through browser settings. The specific steps are as follows:

1. On the Windows photo viewer, you will see the picture of the icon.

2. Next, drag the image to be converted into the browser, and click Print through the displayed position.

3. At this point, directly select Save as PDF from the drop-down menu.

4. If there is no problem, set the corresponding parameters according to the actual situation to save.

5. In this way, you can see the corresponding text in Adobe Reader, and the pictures can be clearly converted into PDF.