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How to Add Comments in PDF in a Few Minutes

When receiving one PDF document for reviewing and needing to give some suggestions, the best way to do it is by adding comments in PDFs. If you do not know how to do that, this article gives you a detailed guide to add comments in PDF on Windows, Mac, Android, and iOS. Just go ahead and follow the guide step by step.

Part 1: How to Add Comments to PDF on Windows?

To add comments to PDF, you need to choose one PDF editor with the adding comments feature. UPDF is one of them. Here, we will recommend you use UPDF to add comments to PDF as it allows you to add text comments, add text box comments, add sticky notes, add text callouts, and add stickers per your requirements. Moreover, you can highlight, strikethrough, underline, and squiggly the contents to add comments. And if you want to have a pencil to draw, then, comment, UPDF can also do that. With so many features, using UPDF is a great option. And UPDF can work on Windows, Mac, Android, and IOS. So, we will cover these 4 devices here. But first of all, let's show you to Windows guide. You can click the below button and follow the guide below.

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Step 1. Import PDF File

As you have opened the PDF document on UPDF, click the "Comment" tab from the left panel.

Step 2. How to Add Comments in PDF Files

Add a "Text Comment"

This opens up a menu providing the commenting features offered by UPDF. Select the "Text Comment" button from the top to add a comment on your PDF. Set the font style, size, and color as you tap anywhere on the PDF to add the comment. Write down the comment and add it to your PDF.

Add text comments to PDF with UPDF

Add a "Text Box"

You can also add a "Text Box" as a comment on your PDF document in UPDF. As you select the button from the top, tap anywhere on the PDF where you want to add the comment. Following this, specify the style of the text box and define the parameters for the font style, size, and color. Write down the text in the box and conclude by adding a comment.

Add text box with UPDF

Add a "Sticky Note"

UPDF also offers you to add a "Sticky Note" as a comment on the PDF document. Select "Sticky Note" from the top buttons and tap where you want to add it to the document. Type in the text across the note that opens on the screen and changes the color if you wish to.

Add sticky notes to PDF

If you are tired of reading text guide, you can download UPDF via the below button and follow the below video guido to add comments to PDF.

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Video Tutorial on How to Add Comments to PDF

Part 2: How to Insert Comments in PDF on Mac?

If you are a Mac user, UPDF can also help you add comments in PDF on Mac. Just click the below button to download UDPF on your Mac. Then, follow the below steps.

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add comment to pdf on mac in updf

Step 1. Launch the UPDF

Begin with launching the UPDF tool on your computer and open its main interface. To import the PDF file, click on "Open File" and select the document you want to edit.

Step 2. Select Comment Tool

Navigate to the "Comment" icon displayed on top and click on it to open options for adding annotations.

insert comment in pdf comment button

Step 3. How to Add Comment on a PDF on Mac

Tap on the icon of "Sticky notes", "Text Comments", "Text Box", or "Text Callout" and click on a particular part of the document where you want to add the comment. Afterward, add the text on the displayed text box of the sticky note and click enter to post the comment on your file quickly.

how to add comments in pdf file on mac

Besides this tool for Mac, if you want to learn more about other tools to add comments to PDF on Mac, there are the top 5 PDF annotators for Mac, giving you more opportunities to choose a proper tool.

Part 3. How to Add Comments in PDF on iPhone/iPad?

The steps are very simple to add comments in PDF on iOS with UPDF. Same as on Windows and Mac, you need to click the below button to download UPDF on your iOS. Then, follow these steps: Open the PDF with UPDF on iOS, tap on the "Pencil" icon > "Text Comment", and tap the place where you need to add the comments in PDF on iPhone/iPad.

Part 4. How to Add Comments in PDF on Android?

It is also easy to add comments in PDF on Android with UPDF. Just open PDF with UPDF, tap on the "Pencil" icon > "Text Comment", and tap on the place where you need to add the comments. Input the contents. And save it.

Text comments in PDF on Android UPDF

It is very easy to use UPDF to add comments to PDFs on any device. And UPDF it not only a tool to add comments to PDF, but also a tool that has many features. You can download UPDF via the below button or read this UPDF review article from howtogeek to know more about it.

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Part 5: What Types of Comments Does UPDF Support?

UPDF provides the option of adding four types of comments within PDF documents. We have set up an introduction of these types along with the significance they present within the document:

  • Text Comment: These are simple lines of comments that can be added and adjusted across a document. This is usually considered an informal form of adding comments in a PDF document, where you type in the text corresponding to the content written in the PDF file to let the author know about the problems that you might have.
  • Text Box: Such forms of comments are considered more professional and elegant. Having the problem written in a text box helps people differentiate the points correctly. Professional and official documents usually contain such forms of comments on the documents.
  • Sticky Notes: If you do not want to cover the PDF document with text comments and boxes, it is best to use a sticky note. With the details of the user that is adding the note, it does not disrupt the outline of the PDF document.
  • Text Callout: Text callouts allow you to write the comments in the blank place pointing out which this comment belongs to.

Part 6: How Does Commenting in PDF Help Users?

There are some specific reasons why commenting has been added to PDF documents. Although this has been an everchanging feature in PDF editors, there were some potential reasons why it was added to the platforms:

  • Using comments to explain a particular point removes the ambiguity that remains between both parties. One party can define the parameters and pointers properly to the other party.
  • Marking something without getting it printed saves paper which is good for the environment and the office in terms of cost. Documents can be managed digitally without printing them out.
  • These documents that are commented on can be shared with a diverse set of users. Where printed documents are restricted within the location, digitally commented documents can be sent and shared with other users anywhere in the world. Accessibility to files gets much more manageable with such features.
  • You can avoid unnecessary rejections of the document that you must submit to the higher authorities. The option of commenting would not disrupt the formatting of the PDF file, helping you to amend all the problems in the document without going to any other source.

Part 7: Why Can't I Add Comments in PDF?

Many users find it difficult to add comments in PDF files for some reason. As a result, they are unable to do their quick revisions and lack comprehension of concepts quickly. Some of the reasons are:

  • There are many PDF tools that do not allow adding comments on the files automatically. Or in another case, some tools lack the feature for adding comments on PDF files directly. Due to the restriction from a particular PDF tool, you would be unable to add comments on the files consequently.
  • Another major reason is that many files limit the editing process while adding comments on them. As a result, you may enter comments on the file but would find difficulty in editing the document, such as adding pages or typing content.
  • Some tools may allow you to add comments but only in a separate copy. It means that if you want to add a comment, the tool would require you to make a copy of the file first, and then it will allow you to comment properly.

Part 8. FAQS About Adding Comments in PDF

Q1. How to Add Comments to a PDF in Google Drive?

If you already have a PDF in Google Drive, you can click the "Three Dots" after the PDF document, select "Open With" > "Preview", click "Add a comment", and highlight the content to add a comment.

Q2. How to Add Comments in PDF with Adobe Reader?

You can open the PDF file with Adobe Reader, now, click the "Add a Comment" icon at the left side menu, click the place where to add the comments, enter the content, and then, save it.

Q3. How to Add Comments to PDF in Preview?

Open the PDF in preview, and click "Show Markup Toolbar" > “Note” to type the text comments in the PDF with preview.


Many people don't know how to add comments in PDF files which may prevent them from smart learning and collaboration. With this article, we are sure that you know how to add comments in PDF now. Whether you need to add comments to PDF on computers or on mobiles, you can use UPDF. Why not download UPDF via the button to try it now? And if you like this tool after testing, you can upgrade to the pro version at a low price.

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