How to Display Required Form Fields with Red Borders in Adobe Acrobat
Question details
The user needs to make required fields in a fillable PDF consistently display a red border for end users viewing the document.

- Product
- Adobe Acrobat
- Device & OS
- not provided
- Scenario
- Creating or distributing a fillable PDF form and ensuring that the required fields are clearly marked and visible for the person filling it out.
- Observed behavior
- Required fields show red borders on the form creator's computer but do not display these red borders when the PDF is opened by another user in Adobe Acrobat Reader.
Before troubleshooting the display settings, ensure that you have actually designated the necessary form fields as 'Required' within the PDF form field properties.
Adjust Form Field Highlighting Settings in Adobe Acrobat
The display of required fields depends heavily on the end user's Acrobat Reader preferences. You can instruct users to enable form highlighting on their own machines.
Acrobat controls the appearance of required fields through local application preferences rather than strictly embedding the red border in the document itself. If a user has form highlighting turned off in their viewer, the red borders will not appear.
Launch Adobe Acrobat or Acrobat Reader. Navigate to 'Edit' from the top menu and select 'Preferences' (on Windows), or click 'Acrobat' > 'Preferences' (on Mac).
In the left-hand pane of the Preferences window, click on the 'Forms' category to view form-related settings.
Under the 'Highlight Color' section, ensure that 'Show border hover color for fields' is checked. Check the 'Required fields highlight color' box and set the color to red.

Manually Format Field Borders to Always Display Red
If you cannot rely on end users changing their Acrobat settings, you can manually set the field's border color to red in the form properties to force it to display.
Create and Fill PDF Forms Smoothly with WPS PDF
WPS PDF provides an intuitive way to create fillable forms, set required fields, and easily highlight them. You can ensure a seamless experience for users filling out your documents without worrying about complex hidden settings.
- 1. Open the PDF in WPS Office: Launch WPS Office, click on 'PDF' on the home screen, and open your document.
- 2. Access Form Tools: Navigate to the 'Form' tab on the top ribbon to view all form creation, filling, and editing tools.
- 3. Highlight Form Fields: Click the 'Highlight Fields' button in the toolbar to instantly make all interactive and required fields easily visible to the user.

Frequently Asked Questions
Why do required PDF fields show up differently on different computers?
Adobe Acrobat and Acrobat Reader use local application preferences (found under Edit > Preferences > Forms) to determine how form fields are highlighted. If the recipient has field highlighting disabled on their computer, the red borders will not appear regardless of how you saved the file.
Can I force Adobe Acrobat Reader to highlight required fields red?
You cannot forcefully override a user's local Acrobat Reader highlighting settings through the PDF file itself. To ensure a red border always appears, you must manually change the field's Appearance properties to have a red border, rather than relying on the software's 'Required' highlight.
How do I mark a text field as required in a PDF?
In your PDF editor's form preparation mode, right-click the text field, select Properties, and check the 'Required' box under the General tab. This marks the field systematically and usually prevents users from submitting digital forms without filling it out.




