PDF Editing Issues

How to Create a Comb Field for Phone Numbers in Adobe Acrobat

Tauseeq MagsiTauseeq Magsi Oct 28, 2026 868 views

Question details

The user needs to format a PDF form text field as a comb field to separate entered phone number characters into individual, fixed-length boxes.

How to Create a Comb Field for Phone Numbers in Adobe Acrobat
Product
Adobe Acrobat
Device & OS
not provided
Scenario
Creating or modifying a fillable PDF form where fixed-length inputs like phone numbers require individual cell formatting.
Observed behavior
The user needs to configure text fields so that digits are divided into separate cells, noting that standard character limits conflict with the comb option.
Before you start

Ensure your PDF document is open in form editing mode and that you know the exact digit groupings required for your phone number format, such as a 3-digit area code followed by a 3-digit and 4-digit segment.

Solution 1Recommended

Configure Comb Options in Text Field Properties

Use the Options tab within the text field properties to enable the comb feature and specify the exact number of cells for the phone number segments.

A comb field automatically separates entered characters into individual boxes, which is perfect for fixed-length data like phone numbers or identification codes.

In Adobe Acrobat, the 'Comb' option and the standard 'Limit of characters' option are mutually exclusive because both attempt to restrict the character count. You must disable the standard character limit before applying the comb layout.

1
Access Field Properties

Right-click the designated text field for your phone number and select 'Properties' from the context menu.

2
Navigate to the Options Tab

In the Text Field Properties dialog box, click on the 'Options' tab at the top.

3
Disable Character Limits

Ensure that the 'Limit of [ ] characters' checkbox is unchecked. If it is checked, the Comb option will be grayed out or unavailable.

4
Enable the Comb Field

Check the box next to 'Comb of [ ] characters'. Enter the specific number of cells needed for this segment (for example, type '3' for an area code).

5
Repeat for Other Segments

Click 'Close' to save the settings. Repeat this entire process for the remaining parts of the phone number, creating separate comb fields for the 3-digit prefix and 4-digit line number.

Configure Comb Options in Text Field Properties
Pro Tip: Aligning the text to 'Center' in the Options tab can help the digits appear perfectly balanced inside each individual comb box.
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Frequently Asked Questions

Why is the Comb option grayed out in Acrobat?

The Comb option is only available when the 'Scroll long text' option is unchecked and standard character limits are disabled. It also requires the field to use standard fonts without Rich Text formatting enabled.

Can I use the Comb feature for dates or Social Security Numbers?

Yes, comb fields are ideal for any fixed-length data entries such as Social Security Numbers, dates, or ID numbers, as they force the user to enter exactly one character per designated box.

How do I align the text inside a comb field properly?

In the Text Field Properties menu, under the Options tab, look for the 'Alignment' dropdown. Setting it to 'Center' usually ensures that the characters sit perfectly within their respective boxes.