Underline PDF on Mac with a desktop application

Compatible with macOS Catalina and Big Sur
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Go completely paperless, underline PDF on all your devices

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What you get with pdfFiller for Mac

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Change text, highlight or blackout content, add signatures, convert documents into templates, and more. screen
Make a document fillable by adding fillable fields. Send it to your customers or colleagues and receive filled out copies right in your account. screen
Every change you make in a document is saved in the cloud, not on your computer. Storage limits? They don't exist. screen
Quickly add a ready-to-fill document from the built-in library instead of creating it from scratch. Contracts, agreement, tax forms - get the form you need in seconds. screen

Underline PDF on your Mac like a pro with a desktop app

Don't let the irritating paper document workflow slow down your growth. Install the pdfFiller desktop program for Mac and go paperless within minutes.

Get started and underline PDF with pdfFiller for Mac with the app

1
Install the desktop app
Download and install the version that suits your PC.
2
Log in
Enter your account credentials or create a new one.
3
Start editing
Create or upload a document and start editing in seconds.
Coming soon to pdfFiller for macOS
We’re currently focused on adding these features as soon as possible to the desktop app.
Collaboration tools
Sharing tools
E-signature automation
Have a question or want to suggest a feature?
Contact our Support, we’ll be happy to help.

What pdfFiller customers are saying about the desktop PDF editor app for Mac

See for yourself by reading reviews on the most popular resources:

How to underline PDF on a Mac using the pdfFiller desktop application

PDF has become firmly attached to our lives. Some people use it everyday while working on documents. While others only have to use it from time to time, for example, when they need to underline PDF or submit a report. And though that task is basic, it can often require a specialized program. Dealing with the PDF format is not always easy. To make a good PDF editor, it has to be an application software that works on macOS.
pdfFiller is a professional document management tool that enables you to concentrate fully on your work. The pdfFiller desktop app for macOS features comprehensive abilities for editing existing text and adding fillable fields. Quickly and easily create interactive forms and place them on your website for your and your colleagues effectiveness.

Get the application installed following the steps below and underline PDF directly from your Mac

01
Open your browser and launch pdffiller.com
02
Download an application software for macOS
03
Go to Finder -> Applications -> pdfFiller
04
Install the app and launch it
05
Provide your account credentials or create a new one
06
Upload a form or select one in fillable format from the built-in library
Once you opened your document you need, you're ready to underline PDF. Get everything you need done in clicks. The user-friendly interface will guide you over the process. It’s not overly cumbersome but instead is straightforward and gives immediate access to common features. The well-organized guidelines make it easy to locate the tools you need to create, change, and underline PDF documents on Mac computer.
Furthermore, you can handle document management from multiple devices thanks to syncing apps for different platforms. While your computer may be unavailable, the pdfFiller application for macOS ensures that you have access to all documents and editing features from your Mac. Editing and signing documents at once is a practical time-saver for both work and individual use. Reduce daunting, repetitive paper processes using pdfFiller.
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Questions & Answers

Below is a list of the most common customer questions. If you can’t find an answer to your question, please don’t hesitate to reach out to us.
Open the PDF document you wish to underline text in. Locate the "Comment" icon on the left toolbar and click on it. From the markup options on the top toolbar, select the underline symbol to enable the underline feature. Once the underline feature is activated, hover your cursor over the text you want to underline.
How to Underline Text in PDFs? Click Tools. on the toolbar -> hit Underline -> choose the words or sentences you want to emphasis; Or choose the text at first -> click Tools on the toolbar -> hit Underline; Or press shortcut Ctrl + Alt + U -> then select the text you want to underline.
Steps to drawing with Mac Preview Open the file in Preview by default, or control-click the file and choose Preview. Click Show Markup Toolbar. Click the Draw icon.
In the Preview app on your Mac, click the Show Markup Toolbar button (if the Markup toolbar isn't showing). Use the tools in the toolbar to mark up the PDF (or use the Touch Bar).
(Or, press Command-Control-H.) Click and drag the cursor to highlight long sections of text. Double-click to highlight a word. Triple-click to highlight a full line.
Sometimes, scanned images are bundled and merged into a PDF file. Such a file can be described as a scanned PDF. They differ from standard PDFs in that editing them is usually not possible. If you cannot highlight or select text in a PDF, the file might probably be a scanned copy and cannot be edited.
Make sure that the security settings allow form filling. (See File > Properties > Security.) Make sure that the PDF includes interactive, or fillable, form fields. Sometimes form creators forget to convert their PDFs to interactive forms, or they intentionally design a form you can only fill in by hand.