Using the most recent version of .Net Aspose.PDF (24.5.1) it appears that the “text-decoration-thickness” css property on and anchor tag is not supported when converting from HTML to PDF.
In the attached zip, you can see that we are setting this property to “2pt” and can clearly see that it is much thicker in the HTML than the PDF
Using the attached HTML, you can use your online converter and see the same results pdf/net/conversion/html-to-pdf/
hyperlink_thickness.zip (27.1 KB)