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Free | How to Underline in PDF with 4 Easy Solutions

Jane Zhou updated on May 18, 2021 to PDF Editor Tutorials

If you want to emphasize the text in your PDF file, there are two ways to get the work done. One is to highlight PDF, and the other is to underline text in PDF.

Here, we will focus on the latter – how to underline in PDF. This article will show you four easy yet effective PDF editors, and give you detailed tutorials to underline text in PDF with them.

Part 1. How to Underline Text in PDF with EaseUS PDF Editor on Windows

To underline text in PDF on Windows PC, an excellent Windows PDF editor is a must. If you don't know which PDF editing software to choose, we'd like to share with you EaseUS PDF Editor.

This is an all-in-one PDF editing software, making it extremely easy to make the text in your PDF underlined. Speaking of editing text, this software allows you to add, delete, copy, paste text to PDF, and even change its font and color based on your needs.

Except for that, you also can use it to edit PDFs, compress PDF files, or manage PDF pages without any hassle.

Stunning Features:

  • Reduce PDF size with one simple click
  • Password protect PDF file to protect it from unauthorized viewing and copying
  • Create a PDF from more than 10 file formats or vice versa
  • Support OCR features to make the scanned PDF editable

Check the following steps to learn how to underline text in your PDFs! But first, download it!

Step 1. Launch the EaseUS PDF editing program, then click on "Open Files" to import your desired PDF document.

Import PDF

Step 2. When the PDF is imported, click "Edit" in the top toolbar. You can see many editing options in the right sidebar.

Click on

Step 3. Navigate to your PDF, find and select the text you want to underline, then click on the "Underline" option.

Underline text

Step 4. Finally, click "File" > "Save" to export the PDF and save it on your computer.

Save PDF

Part 2. How to Underline in PDF Using Preview on Mac

For Mac users who only want to make the PDF text appear bold or underlined, Preview is the best choice.

This freeware is already on your Mac so you don't need to download any software. With its help, you can easily view, convert, edit, or add image to PDF in a few simple clicks. When it comes to underlining the text, it is a piece of cake by using Preview:

Step 1. Find the PDF file on your Mac computer, then right-click on it to open it with Preview.

Open PDF in Preview

Step 2. After importing, navigate your PDF in Preview and select the text you want to underline.

Step 3. Click on the Pencil icon in the right top toolbar, next, select the "Underline" option in the drop-down menu.

Underline text in Preview

Step 4. At last, click "File" to save the edited PDF file on your Mac.

Part 3. How to Underline Text in PDF with Adobe Acrobat in Windows and Mac

In this section, we will share with you a multi-compatible PDF editing software to underline in your PDF. That's Adobe Acrobat.  

This software can run perfectly on both Windows and Mac computers. And it will assist you in making the text bold, italic, and underlined. In addition, this program enables you to add hyperlink to PDF files or compress your PDFs for later sharing.

Here's how to underline text with Adobe Acrobat:

Step 1. Download Adobe Acrobat if you do not install it, then open your desired PDF files with it.

Import PDF into Adobe Acrobat

Step 2. Click on "Tools" > "Edit PDF", and select the "Edit PDF" in the right sidebar.

Open PDF editing window

Step 3. Select the "Underline Text" option to underline your text. Besides, you can also make the font bold quickly.

Underline text

Step 4. When you finish your editing, click "File" > "Save" or "Save As" to export the new PDF document.

Export and save PDF

Part 4. How to Underline Text in PDF Online for Free

Is it possible to underline text in PDF without downloading any software? Of course, yes!! Apart from offline programs, online PDF editing tools can let you do the same task easily.

On the market, there are many online PDF editors you can select. Here we will take PDF Bob as an example and show you how to use it to make the text underlined:

Step 1. Go to the official website and upload your PDF file.

Step 2. Once your PDF file is imported, you can see some editing options in the left sidebar. To underline the text, click on the penultimate icon.

How to underline text in pdf online

Step 3. Here you can select your favorite color. Then tap and hold to simulate a right-click on the mouse to select the text area you want to underline in your PDF.

Step 4. Finally, click the "Export" button to download the underlined PDF document.

Final Words

This post walks you through 4 easy methods to underline the text in PDFs. Whether you are a Windows or Mac user, you can always find the right tool to complete the task.

If you work on Windows PC, we strongly recommend EaseUS PDF Editor. This program can not only let you edit the text but also modify the image, page, or any other you want to edit with simple clicks.