How to Underline Text in a PDF on iPad

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1. Open the PDF document in Highlights

Locate and tap the PDF file you want to open in the Highlights document browser:

iPad displaying Highlights document browser.

The PDF opens in a document scene:

iPad displaying a PDF document open in Highlights

2. Select the text you want to underline

If you use an Apple Pencil or mouse, this will bring up the full selection popover:

Text selection popover

If you use your finger, this will bring up the standard selection popover (without color options).

3. Choose a color and tap the underline button in the selection popover

Underline icon

Your annotation is added to the PDF and the text you underlined appear in your notes which you can easily share.

Similarly, you can also highlight and strikethrough text in PDFs.