Annotate with text markup tools
Text markup tools let you indicate the text that needs more attention without changing the actual text in PDF.
To mark up text
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Open a PDF and choose Comment > Text Markup, and then select one of the text markup tools. Alternatively, select the text to mark up using the Select tool, right-click on the text, and choose a text markup tool from the options.
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Ways to mark up text vary depending on the text markup tool you use:
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Highlight. Click the text and drag to mark. Release the mouse to finish.
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Highlight Area. Click-drag to define the size and location of an area.
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Cross-out. Click the text and drag to mark. Release the mouse to finish.
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Underline. Click the text and drag to mark. Release the mouse to finish.
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Insert Text. Click anywhere on the page to add text.
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Replace Text. Click the text and drag to mark. Release the mouse to finish.
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Double-click the text markup to call out its pop-up note in which you can type a message as feedback or comment. Pop-up notes of the markups created by Insert Text or Replace Text will show automatically without requiring a click.
To delete text markup
Do one of the following:
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Right-click on the marked text with Hand tool and select Delete.
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Right-click on the marked text with Select tool and select Edit > Delete.
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Click with either the Hand tool or the Select tool and press Delete on the keyboard.
To edit text markup properties
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Select either the Hand tool or the Select tool. Click on the markup to have it highlighted with a blue frame. Right-click on the markup and select Properties….
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In the text markup Properties dialog box, do any of the following as needed:
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On the Display tab, edit visual characteristics of the selected text markup.
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On the Author and Subject tab, you can edit the Author and Subject
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On the History tab, you can view all changes made to the text markup.
Note: you can apply more than one markup on the same text, meaning the text can also be underlined and highlighted.

Highlighted text (Left), Text that is both highlighted and underlined (Right)