Online Image Converter Poor Quality

The online Adobe image conversion service at,
https://acrobat.adobe.com/link/acrobat/jpg-to-pdf

...claims to produce PDFs of the same image quality, from JPG or PNG. However, PNG files converted to PDF are poor quality with JPG lossy "fuzziness" around the edges of typefaces and lines. Horrible.

I would recommend that you either change your description to JPG quality, or upgrade the PDF image quality to that of "lossless" image creation. JPG is okay for photographs, normally, but they are horrible for graphics, charts and text.