Question: **Original problem**: I have a PDF document with me which I wish to comment on. However, I have yet to find a PDF editor that has the versatility of text boxes, comments and equation editors etc. as Microsoft Word itself.

As such, I thought of the idea of using the PDF document as a background to a word document, of which I can comment flexibly as much as I want. However, I have yet to find such a function on Word online. How can I go about doing this?

A little more details: I am not interested and having to edit the PDF itself, and I do not even need the final document (after commenting on Word) to detect texts from the original PDFs. In other words, I'm happy with the PDF just being a picture in the Word document. A possible solution will be to convert every page of PDF into a picture file, then manually add into Word as background/picture, but given that the document is >100 pages, I seek a less tedious solution.

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**Remark**: I also welcome comments which suggest an alternative solution to my original problem.

Answer: 
I just convinced Word to use a full-page PDF as a background:

1.) File -> Open, choose the PDF file  

2.) Word says it will convert it into a Word file, accept this  

3.) In my case, the PDF was A4 size, 1 page - and I got a docx file in A4 size with the PDF as a full-page image.  

4.) Select the image, cut-and-paste it into the header or footer of the word document, and re-adjust the position (page, 0cm, page, 0cm)

Voila: The word file has the pdf as a background, and you can draw text boxes on top of it, or whatever Word lets you do in a document.
Manually converting a 100-page PDF file into a picture is a very time-consuming process.

As far as I know, there is no particularly suitable OOTB method to complete this step.

I actually recommend that you use some third-party tools to convert PDF files into pictures in bulk or directly into word files.