A quick google search has lots of ways to do it, this article has a few suggestions for free apps to use to accomplish this. Hopefully one of their ideas works for you! https://lightpdf.com/change-pdf-background-color.html
I recently tried LightPDF's audio to text feature and it is good for converting recordings or videos to text. I used it frequently after I found it and feel it good, and it is free to use.
Thats easy. I can recommend some of the best ones that ypu can use online for free. Actually, I personally use them. Among those tools I will give LightPDF the upperhand. Although you can also try inicio. You can follow through below to see how you can use LigthPDF.
Here is a potential starting point. Also try googling each specific title and pdf (sometimes things turn up). Also, see if your school library has a copy in stock you can check out.
Diigo's probably my most important program. I have years of notes in it. In addition to helping you take notes and annotate web pages, it also lets you jump back to pages you've annotated and commented on. That happens on your dashboard page. You could export all your notes from your dashboard page into a report as well as search notes you've taken. If you upgrade to a paid membership, Diigo can search the full text of all pages you've saved there. But, Diigo only lets you work with PDFs that are online.
You can search for free PDF readers that let you annotate and take notes on PDFs. That last time I checked (quite a while back) there were free ones besides this online PDF editor at https://lightpdf.com/. It lets you annotate and add notes to PDFs. The only issue is that you have to upload your PDF. Uploads may take time for large PDFs and you may not want to upload proprietary information.
That website also has a download button that downloads the ApowerPDF desktop program. It also lets you annotate PDFs and add text notes. It also lets you combine multiple PDFs into one.
You can also insert a PDF into OneNote. I assume there's still free version of that. You can then type notes on the right side of the PDF as well as draw on top of the PDF.
The Step Recorder method might be my last choice since you are working with Web pages and PDFs.
Thanks for sharing! Another online PDF converter is the LightPDF. This program can also manage your PDF with ease. Moreover, it comes with a reliable and accurate OCR tool. Try it here: https://lightpdf.com/
If you are looking for solutions to delete pages, here are some solutions: https://lightpdf.com/delete-pages-pdf.html There is a solution - ApowerPDF, which has a free online version to edit, modify, add, replace, rotate PDF, etc. But it only has Windows version. If you use Windows, you can give a try.