Highlight, strikeout, or underline text

These tools allow you to make corrections to the PDF document, such as striking out wrong parts of the text, highlighting important parts or underlining parts you want to emphasize. Unlike text editing tools, commenting tools do not alter the original content of the document. So, for example, stricken out text looks like that only for the purposes of reviewing.

Highlighting the text

To highlight the text, click the Highlight Text button on the toolbar, or select the tool using the down arrow:

Then, select the text you want to highlight:

When you release the mouse button, the selected text gets highlighted.

Striking out the text

To strikeout some text in the PDF document, click the Strikeout Text button on the toolbar, or select the tool using the down arrow.

Then, select the text you want to strikeout. This will make the selected text stricken out.

Underlining the text

To underline some text in the document, click the Underline Text toolbar button   or select it in the dropdown menu.

Then, select the text you want to underline. This will make the selected text underlined.

Editing highlighted, underlined or strikeout text properties

To edit properties of the highlighted, underlined or strikeout text, select the Hand Tool using the corresponding toolbar button or the Tools menu (Alt+6). Then, click the text you want to modify.

For example, you can adjust the highlight visibility both in printing and on the screen, color and opacity of the highlight background, as well as the line width, and specify a comment displayed when a user hovers the mouse pointer over the text:

You can also change the status of the comment and enable the Locked option, so only the author can modify properties of the highlighted text.

More like this:

Editing Objects in the PDF Document
Optical character recognition in PDF
Commenting PDF Files