Open the screenshot on your device
Select Print or Share
Choose Save as PDF or PDF
Select the destination folder
Save the file
On Windows, open the screenshot and press Ctrl+P, then choose Microsoft Print to PDF
On Mac, open the screenshot and press Command+P, then choose Save as PDF
On iPhone, open the screenshot in Photos, tap Share, then use Print and pinch out on the preview to create a PDF
On Android, open the screenshot, tap Share or Print, then choose Save as PDF
Use an online image-to-PDF converter if needed
Rename the PDF file if desired