Commenting on your working documents after reviewing them make your opinions, insights, and feedback clearly expressed to your coworkers, which facilitates the efficiency of remote collaboration and business operations.
There are a ton of utilities with which you can comment on a document. Today in this post, we’ll talk about how to add comments to a PDF document on any device: Windows, Mac, or online, using a PC or mobile phone. So no matter what device you’re on, you can easily share your ideas with others across all working platforms.
Since there are both online and offline methods, you’ll be able to do your job with or without an internet connection (and even if you’re on a plane).
How to Add Comments to PDF on Windows (Offline)
We’ll start with commenting on PDF documents on Windows 10 and Windows 11 computers since these two operating systems cover the majority of the working environment these days.
To add comments to PDF on Windows, what we need is a PDF comment tool. And one of the best of them is PDFgear Desktop.
PDFgear Desktop is the best PDF comment software for Windows and Mac computers, it’s a free-to-use program encompassing any PDF management features you can think of: PDF compression, PDF conversion, PDF signing, PDF annotation, etc.
Within a program, a variety of practical PDF commenting features is offered. Now follow the tutorial to add comments to PDF on Windows using PDFgear Desktop!
Step 1: Go to PDFgear to free download and install PDFgear Desktop, it’s compatible with both Windows and Mac.
Step 2: Launch PDFgear Desktop, and hit the Open File button from the upper side to load the PDF you intend to comment on into PDFgear Desktop.

Step 3: Go to the Annotate section and hit the Note button below.
Step 4: In the pop-up comment box to the right, input the text that you intend to comment.

Step 5: Lastly, head to the upper-right corner, and hit the corresponding buttons to save or print your commented PDF.
Of course, there are plenty of other useful things that PDFgear Desktop can help you achieve, hyper compressing PDF documents offline, for instance. Now get PDFgear and give it a try!
How to Add Comments to PDF on Mac (Offline)
After introducing the software that helps add comments to your PDF documents on Windows computers (which also work for Mac devices), here comes another practical way to comment on your PDF documents on Mac, and it is a native option.
For this, what we need is the inbuilt PDF reader application on Mac: Preview app. Preview comes preinstalled on your Mac computer and Macbook, so no software installation is needed. Additionally, it helps you comment on your working documents in different styles.
Step 1: Open the PDF document with Preview app on Mac
Step 2: Go to the toolbox and enable the PDF markup tool from the annotation toolbar
Step 3: Click on the note icon, and then the yellow comment box will appear.
Step 4: Type the desired comment text into the comment box.

How to Add Comments to PDF Online for Free
The introduced offline methods for Windows and Mac are reliable if you need to add comments to your PDF documents without an internet connection. However, if a stable internet connection wouldn’t be a problem for you, then an online PDF comment tool is probably the handiest option here.
Meet PDFgear, a free and comprehensive PDF management online tool. With it, you can do many things including PDF commenting on various devices such as Windows 10, Windows 11, Mac, Linux, Android, iOS, etc.
It only requires an internet connection and a web browser application. Now let’s get started.
Step 1. Go to PDFgear PDF Editor
Use a web browser tool and navigate to PDFgear. Then drag and drop to import your PDF document into PDFgear.

Step 2. Comment on PDF Using PDFgear
Hit the comment button (with a speech bubble icon) from the upper side to add customizable comments to your PDF documents.

Step 3. Download the Commented PDF
When you’re done commenting, hit the buttons from the upper-right side to print or download the commented PDF from PDFgear.

How to Add Comments to PDF: FAQs
How to Add Notes to PDF in Chrome?
To make notes on a PDF in Chrome, drag and drop open the PDF document in Chrome. Click on the “More actions” menu in the upper-right corner of the window and select “Add notes.” In the pop-up text box, you can easily type in your comments. Additionally, text fonts, sizes, and colors are also adjustable. When ready, click the “Save” button from the upper-right corner to save the changes.
How to Add Comments to PDF in Adobe Reader?
To add comments to PDF in Adobe Reader, open the PDF document, and click on the “Comment” tool in the toolbar. Reposition the text box on the page, type the desired comment in the box, and press Enter.
Why Can’t I Add Comments to a PDF?
Having trouble adding comments to a PDF, chances are the document is protected. To add comments to a protected PDF, you’ll need to enter the password for the document. But if you don’t have the password for the protected document, use PDFgear to unlock the PDF document first.
To Sum Up
So that’ll be all the 3 best ways to add comments to PDF, have you acquitted them yet? They have their upsides and downsides and work on different devices and working conditions. But I believe that there’s one that will work for you, right?
Let us know what you think by leaving a message in the comment section below, we’ll love to hear from you. Your unique thoughts, your questions, your issues, anything!