As one of the most popular and powerful PDF programs in the world, Adobe Acrobat integrates multiple features pertinent to editing PDF forms, take a closer look at how Adobe edits the font size in text boxes:
Step 1: Open a PDF form with Adobe, then navigate to Tools and choose Prepare Form;
Step 2: Right-click the field that needs modification;
Step 3: Go to Properties and choose Appearance;
Step 4: Adjust the font size or other settings if needed.