You should use alt text in Word if your documents will be read by people who rely on accessibility tools like screen readers. And once you add alt text in Word, you can view or edit it at any time.

Learn how to remove, turn off or disable Alt Text for pictures in Microsoft Word. Uncheck Automatically generate alt text for me check box.

To see alt text in a completed PDF document, you'll need to use a screen reading app, which is an accessibility tool for visually impaired users.