Pdf Builder with new preview page

If your main requirement is to convert HTML page (file) to PDF document, you can try using LEADTOOLS .NET Document Converter class, which supports this type of conversion. You can start by trying to document viewer interactive demo here:
https://www.leadtools.com/demos/click-once/document-viewer
And then you can find more details about the conversion features here:
https://www.leadtools.com/help/leadtools/v19m/dh/to/doxc-topics-documentconverters-using.html
(Disclaimer: I am an employee of this library).