Sejda PDF Desktop is free with the following pros and cns according to Lifewire:
Pros
Lets you load the file from other websites.
Supports adding hyperlinks.
Includes a signature tool.
Lets you insert blank pages into the PDF.
Can remove pages from the PDF.
Supports whiting out parts of the page.
Can insert images and shapes.
Cons
Can be used on only three PDFs per hour.
Limited to docs with fewer than 200 pages.
Doesn’t edit files larger than 50 MB.
Sejda PDF Editor is one of the very few PDF editors that actually lets you edit pre-existing text in the PDF without adding a watermark.
If you can work with the limitations of the free version, Sedja is a great pdf program. It is very easy to work with.