How to Add Underline to Text or Spaces in PDF Files

Benefits of Underlining in PDF

PDF (Portable Document Format) is a file format developed by Adobe in 1992. This file format is very popular on many formal occasions because it can present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.

You may see that many electronic government documents, legal documents, corporate contracts, academic documents, instructions, journals, etc. will be published or shared in the PDF file format.

To better convey the author's ideas, PDF files allow you to add various contents, such as text, pictures, videos, links, signatures, comments, etc. Sometimes, you may need to add an underline to PDF. The main 3 cases are as follows.

#1. Add Underline to Spaces

In this case, underscores are generally used to indicate missing or unfilled content. For example, in forms or fill-in-the-blank questions, you may often see underscores, which can guide the filler to enter information in the specified location.

#2. Underline Text in PDF

When writing, you may need to emphasize certain words. For example, if you are writing an article and want readers to pay special attention to a certain concept or keyword, underlining comes in handy. Underlining can effectively attract readers' attention and let them understand the key points you want to express in an instant.

Of course, the use of underlining is not limited to emphasis. In some cases, it can also be used to express specific meanings or functions. For example, in some academic papers, the titles of cited books and articles are usually underlined to distinguish them from other texts.

#3. Add Underline in PDF Design

The aesthetic value of underlines cannot be ignored. For example, if you design posters in PDF, you can use underlines as a decorative element, which can provide information and increase visual appeal. In a word, in designing, the rational use of underlines can enhance the overall aesthetics.

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How to Underline Text in PDF

To underline in PDF, you need a PDF editing tool. Then, MiniTool PDF Editor is recommended. It can edit/annotate/convert/encrypt/compress/merge/split PDFs, add images/lines/highlights/links/stamps/stickers/attachments to PDFs, etc.

How to underline text in PDF using MiniTool PDF Editor? Here are 2 ways for you. You can pick one according to your needs.

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Way 1: Add Underline When Editing Text

Step 1: Download and install MiniTool PDF Editor. Right-click a PDF file and choose Open with > MiniTool PDF Editor. Once the PDF file opens in MiniTool PDF Editor, click Edit > Edit All. All text will be divided into different boxes.

Step 2: Click a text box and then use the cursor to select the text that you want to underline. Then, click the Underline icon on the ribbon. The selected text will be underlined.

This way can also allow you to add underlines to spaces. You just need to select the spaces and then select the Underline icon. Then, you can edit the text on the spaces later. The text will be also underlined automatically.

Way 2. Add Underline Markup

Step 1: Open a PDF file in MiniTool PDF Editor. Click the Annotate tab and then the down arrow icon of the Text Markup feature. In the drop-down menu, select the Underline option.

Step 2: Use the cursor to select the text that you want to underline. Then, the underline will be added. Click the underline and tools are offered to help you change the underline color. Click the three-dot icon and you can see more color options.

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Bonus Tip

Some people may have Adobe Acrobat installed. Then, they may want to know how to underline text in PDF using Adobe. Here is a brief guide:

1. Open a PDF file in Adobe Acrobat.
2. Use the Select text tool to select the text you want to mark up.
3. From the markup toolbar that appears, select the Underline option.

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Bottom Line

Sometimes, you may need to add underlines to text or spaces. This post shows you how to do that using MiniTool PDF Editor and Adobe Acrobat. If you encounter issues when using MiniTool PDF Editor, contact us via [email protected]. We will get back to you as soon as possible.