Show HN: PDF Annotator of Nightmares

A major drawback for me is that Inkscape can only open single pages (if you don't map PDF pages on layers — if I understand correctly, layers are already used for "overlaying" here).

That's why my favourite open source tool for PDF annotating is Xournal or it's even better fork Xournal++ (https://xournalpp.github.io/). It can easily import, annotate and export multi pages PDFs without any loss in quality or file size increase.