Sharp screenshots in a PDF
Each PNG becomes one page of a single PDF, in the order you set, on A4, US Letter or a page fitted to each picture. On this page PNG pictures go into the PDF losslessly, as PNG rather than re-saved as JPG, so small text in a screenshot stays exactly as sharp as it was; the PDF is larger for it. JPG, WebP and HEIC pictures can be added to the same PDF.
Transparent parts of a PNG show as the white of the page. A screenshot’s text is a picture in the PDF, not text you can select; to make it searchable, run the PDF through OCR PDF.