Can I add custom fields to my form?
Yes. SendFox now supports custom contact fields, so you can collect more than just email, first name, and last name — and add those fields to your forms and Smart Pages.
Overview
A contact field stores an extra piece of information on each contact, such as a phone number, company, city, or sign-up date. You create the field once, then reuse it across your forms, Smart Pages, imports, and individual contacts. Custom contact fields are available on every plan — Free, Lifetime, and Pro.
SendFox supports these field types:
- Text — names, companies, free-form notes
- Number — numeric values
- Date — a calendar date
- Phone number — validated phone input
- Country — a country value
- City — a city value
How to create a contact field
- From the top nav, open Audience → Contacts.
- Open the menu on the Contacts page and choose Contact Fields (or go directly to your Contact Fields page).
- Click Create Contact Field.
- Enter a Label (what you’ll see in the app) and pick a field type. SendFox automatically generates the field’s internal name from the label.
- Save. Your new field now appears on your Contact Fields page and is ready to use.


Collect custom fields on a form or Smart Page
Once a contact field exists, you can add it to the sign-up experiences that feed your audience:
- Forms — in the form builder, add your custom field to the form. Use the Manage contacts fields link in the builder to create or edit fields without leaving the page.
- Smart Pages — the Smart Page builder offers the same custom-field options, so visitors who subscribe through a Smart Page can fill them in.
When a visitor submits the form or Smart Page, the values are saved to that contact automatically.
Set or view fields on a contact
Custom field values show on the individual contact’s page, where you can edit them by hand. You can also populate custom fields in bulk when you import contacts from a CSV, or programmatically through the SendFox API.
Troubleshooting
My new field doesn’t appear on my form
- Create the contact field first, then add it in the form (or Smart Page) builder — fields aren’t added to forms automatically.
- Re-publish the form and update the embedded code on your site so the new field is included.
Values aren’t saving
- Confirm the field is actually included on the form/Smart Page the contact used — only fields present at submit time are captured.
- For imports, make sure the CSV column maps to the matching contact field.
Still stuck? Reach the SendFox team through the Help Center.
Frequently asked questions
Do I need a paid plan for custom fields?
No. Custom contact fields are available on Free, Lifetime, and Pro.
How many custom fields can I create?
You can create multiple custom fields and manage them all from your Contact Fields page.
Can I edit or delete a field later?
Yes. Use Edit or Delete next to any field on the Contact Fields page.