# Hidden Fields: Track Traffic and Block Bots

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In this section, you will find insights on forms' hidden fields in ActiveCampaign. 
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Hidden fields are useful to track contact sources when they fill out a form and prevent spambot form submissions. 

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* Hidden fields are text-only custom fields not visible to contacts submitting the form that can be used to pass info about contacts into your account when they submit your form
* They can **only** be used with **Inline forms** in ActiveCampaign and cannot be added to the floating box, floating bar, or modal forms.
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How to set them up: 

* Click the "Website" button in the left-hand menu to access the Forms overview page.
* Select the form you want to edit and click the "Edit" button.
* In the right panel, click "Fields," then select “My Fields” and click "Add a custom field."
* Enter the field name, choose the appropriate group from the "Group" dropdown, select "hidden field" as the field type, and click "Add" to save it.
* Locate the hidden field you created in the list and drag it onto the form in the builder.

Check out our tutorial to learn everything in detail. :point\_down:

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If you have any questions, don't hesitate to [email us](mailto:support@wildmail.io) for free assistance, we are happy to help you.&#x20;