A: Yes. Use LibreOffice Draw (Free, Open source). Import the PDF. Go to Format > Page > Background. Set to solid white. Then export as PDF. This fixes most watermark and dark background issues for free.
Riya is preparing for NEET. She downloads the "Living World" module, but the PDF crashes every time she reaches page 15. She drops the file into the "BioModule Fixer." The tool isolates the corruption, saves pages 1-14 and 16-30 into a new document, and notifies her that Page 15 is missing data. She can now study the rest of the chapter immediately while she finds a source for the missing page. allen biology modules pdf fix
If you have access to Acrobat Pro: