A plain, readable web page
Each PDF page becomes a section labelled Page N, with one paragraph per line of text, in a single self-contained HTML file.
The file carries its own small stylesheet, so it opens in any browser and reads comfortably without anything else alongside it. There is nothing to upload and no folder of assets to keep together. That self-contained quality is the main practical advantage over other conversions: you can email the one file and it will look the same for whoever opens it.