Use a free online PDF editor such as PDFescape, Sejda, or Smallpdf
Open the PDF in Google Drive and edit it with Google Docs
Use LibreOffice Draw to open and edit the PDF
Use Microsoft Edge or Adobe Acrobat Reader for basic annotations and form filling
Convert the PDF to Word with a free converter, edit it, then save it back as PDF
Use free desktop tools like PDF-XChange Editor or Foxit PDF Reader
Use built-in markup tools to highlight, add text, and draw on the PDF
Use free mobile apps like Xodo or PDFelement for simple edits
Remove pages or rearrange pages with free PDF tools
Save a copy after editing to keep the original file unchanged