Use free online PDF editors like PDFescape, Sejda, or Smallpdf
Use Google Drive and open the PDF with Google Docs to edit text
Use LibreOffice Draw to edit PDF files on desktop
Use Microsoft Edge or Adobe Acrobat Reader for basic annotations
Convert the PDF to Word using a free converter, edit it, then save it back as PDF
Use browser-based PDF tools to add text, highlights, shapes, and signatures
Use free mobile apps like Xodo or Foxit PDF Reader on Android or iPhone
Use built-in print-to-PDF tools after editing the document in another app
Use OCR tools if the PDF is scanned and needs text recognition
Save a copy of the edited file to keep the original unchanged