Adobe Acrobat DC Pro is a powerful tool that can help you create, view, and edit PDFs. Adobe Acrobat is the first choice for you to create drop-down menus in PDF forms. Unfortunately, the free Adobe Acrobat Reader does not support this feature. You need to subscribe to Adobe Acrobat Pro.

Sejda is another online PDF tool that you can use to add a dropdown list to a PDF. What's great about this is it does not require you to open a Properties window. There will be a floating toolbar above the dropdown box containing customization options.

Download and install PDF Xcahnge and open your PDF form. Now find the Form tab above and click on it. Now you will see different buttons to add to your form. Click on the drop-down button and drag your mouse to where you want to add the drop-down list. Right-click on the drop-down list box to add items. The Properties menu will open.

To add a drop-down list to a form in Acrobat, open the form in Acrobat. Then click the “Edit” command in the top bar and click the “Prepare a form” link in the Edit panel to show the “Prepare a form” panel. Click the “Drop-down list” link in the “Prepare a form” panel in Acrobat.