Update: This guide works for both legacy Edge and Chromium-Edge browsers. Microsoft Edge browser supports opening PDF files since its introduction. In fact, Edge is the default PDF reader in Windows 10 and offers basic functionalities that you find in other web browsers. While reading a PDF document, you might want to highlight a sentence or word. For instance, you might want to highlight or mark a sentence that indicates something important. Most of the PDF apps and classic PDF readers out there don’t offer an option to highlight or mark PDF files. You need to buy commercial programs to highlight or mark PDF files. Luckily, if you are on Windows 10, you no longer need a third-party tool to highlight or mark PDF files. Microsoft Edge in Windows 10 can now help you mark or highlight texts in PDF with ease. With Windows 10 Redstone 3, Edge browser has received the ability to highlight PDF files. This means that you can now mark PDF files without installing additional programs in Windows 10. You can choose between yellow, green, light blue and pink color to highlight text. The feature is extremely helpful for users who often read PDF files on their computer. For instance, you can highlight important points in a PDF file. Highlight text in PDF using legacy Edge & Chromium-Edge in Windows 10 Here is how to use the Edge browser to highlight PDF files in Windows 10. Step 1: Open the PDF file that you want to highlight with Edge browser. If Edge is the default PDF reader, you can simply double-click on the PDF file to open it with Edge. If not, right-click on the PDF file, click Open with, and then select Microsoft Edge browser. Step 2: Once the PDF file is opened with the Edge browser, select the word or sentence that you want to highlight, right-click on the selected area, select Highlight option, and select a color (which you want to use to highlight the selected area) to highlight the selected area. Alternatively, you can click on the highlight icon (see picture below) that shows up when you select a word or sentence to select the marker color and highlight the selected area. Step 3: Click Ctrl + S or click on the save icon to save the changes.