WPS Features
Resources
Free AI Tools
Docs Center

How to Use

Last updated:July 8, 2026

Use WPS PDF underline through 3 indexed topics, all related to PDF text editing, and choose the entry point that matches your workflow.

How-to Index

No.TopicMembership Requirement
11. Add an underline from the ribbonWPS Premium required
22. Add an underline from the floating toolbarWPS Premium required
33. Use a keyboard shortcut to add or remove an underlineWPS Premium required

How-to Guide

1. Add an underline from the ribbon

Entry point: Edit tab → Edit Content → Underline button

  1. Open the PDF file that you want to edit.
  2. Click the Edit tab on the top menu bar.
  3. Click Edit Content to enter text editing mode.
  4. Select the text that you want to underline.
  5. Click the Underline button (the U icon) on the toolbar.

Success Criteria

  • The selected text shows an underline.
  • The text remains editable and can still be reformatted.
  • The page layout of the document stays unchanged.

Tips While Using

  • If the button is unavailable, make sure you have entered Edit Content mode and selected text first.
  • This action depends on PDF text editing permission.
  • Text inside scanned image content usually cannot be underlined directly.

2. Add an underline from the floating toolbar

Entry point: Floating toolbar that appears after selecting text in Edit Content mode → Underline button

  1. Open the PDF and enter Edit Content mode.
  2. Select the text that you want to underline.
  3. In the floating toolbar that appears near the selected text, click the Underline button (the U icon).

Success Criteria

  • The selected text is underlined immediately.
  • You can continue working on nearby text without switching panels.
  • The floating toolbar remains available for other text formatting actions.

Tips While Using

  • If the floating toolbar does not appear, reselect the text or confirm that you are in text editing mode.
  • This method is useful for repeated edits on short text segments.
  • If the document is protected, related editing buttons may be unavailable.

3. Use a keyboard shortcut to add or remove an underline

Entry point: Keyboard shortcut Ctrl+U

  1. Open the PDF and enter text editing mode.
  2. Select the text that you want to format.
  3. Press Ctrl+U to add an underline.
  4. Press Ctrl+U again if you want to remove the underline.

Success Criteria

  • After the first action, the selected text is underlined.
  • After the second action, the underline is removed.
  • You can switch formatting without leaving the keyboard.

Tips While Using

  • The shortcut works only after text is selected.
  • If another program or system setting uses the shortcut, use the toolbar button instead.
  • Keep the target text selected when removing the underline.