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A Markdown to PDF converter with no watermark on any page: no stamp across the first page, no band along the footer, nothing to remove later. The PDF contains your document and nothing that was not in your Markdown.
It is easy to assume a watermark is a faint logo you can live with. The damage usually goes further than the appearance of the page, because of how the mark is added.
The watermark is rarely there to protect anything. It is the upsell: the free tier has to be good enough to prove the tool works and annoying enough that anyone using the document for real has a reason to pay. That is a reasonable way to run a business, but it means the free output is designed not to be usable, which is a poor deal if you simply want a PDF of a README.
Not every watermark is obvious, and some are placed where you are unlikely to look. Three checks take a few seconds each.
Nothing. No mark, no footer credit, no metadata naming this site as the producer beyond what any browser engine writes, and no page cap that quietly truncates a long document. Page numbers are the only thing this tool adds on its own, they are genuinely optional, and the switch is in the style panel.
This is harder than it sounds, and worth understanding before assuming there is a quick fix. Most watermarks are drawn into the page content — a text or image layer baked in during rendering — rather than stored as separate, removable metadata. One added on a distinct layer can sometimes be stripped with a PDF editor, but one flattened into the page cannot be cleanly separated from the real content underneath, because as far as the file format is concerned it is content now. The dependable fix is not editing the PDF at all: go back to the original Markdown and regenerate the file with a converter that never adds a mark.
A few situations where a watermark is not merely cosmetic:
Yes. Nothing is drawn onto the page that was not in your Markdown. There is no paid tier that removes a mark, because no mark is added in the first place.
Not reliably, and not here — a stamp becomes part of the page content once the file is produced. The dependable fix is to convert the original Markdown again with a tool that does not add one.
No. Long documents convert whole. Very large files are limited by upload size rather than by page count, and 2 MB of Markdown is a great deal of text.
Every PDF carries a Producer or Creator field naming the software that rendered it — that is standard PDF metadata, not a visible watermark. No converter removes it, this one included, and it never appears anywhere on the printed page.
No. There is nothing to add later, because nothing is added now, and there is no paid tier for it to belong to.
Look at every page at full zoom, including the edges and corners, since that is where converters usually place a mark. Then select all and paste into a text editor: anything that appears which you did not write was in the text layer.