FAQ

Common questions about WPS PDF underline usually involve unavailable buttons, non-editable text, and removing formatting; this section covers 4 frequent questions.

FAQ

What should I do if the underline button is grayed out?

1. Make sure the PDF file is already open.
2. Click Edit and enter Edit Content mode.
3. Select the target text again and check whether the underline button becomes available.
4. If it is still unavailable, check whether the file is protected or whether your account has the required PDF editing permission.

How do I remove an underline that has already been added?

1. In Edit Content mode, select the text that already has an underline.
2. Click the Underline button on the toolbar, or press Ctrl+U.
3. Confirm that the line under the text disappears.
4. Save the document so the change is kept.

Why can’t I add an underline directly to a scanned PDF?

1. Content in a scanned PDF is usually an image instead of directly editable text.
2. Check whether the document has already been recognized as editable text.
3. If an OCR entry is available, complete text recognition first.
4. After recognition is complete, enter Edit Content mode and underline the text.

What should I do if Ctrl+U does not respond?

1. Make sure the target text is selected first.
2. Check whether you are currently in PDF text editing mode.
3. Try the underline button on the toolbar to confirm that the feature itself is available.
4. If the button works but the shortcut does not, close other programs that may be using the shortcut and try again.

Glossary