How to Create Hidden Fields in Meta Lead Ads Using Tracking Parameters

Sometimes you need to pass additional information with each lead — such as the vehicle model, campaign source, or product interest — without asking the user to fill it in.

In Meta Lead Ads, this can be done using Tracking Parameters. These act like hidden fields that are automatically attached to the lead when the form is submitted.

This guide explains how to add hidden fields like:

These values will be included with every lead generated from the form.

Step 1: Open Lead Ads Forms in Meta Ads Manager

1. Go to Meta Ads Manager

2. Navigate to All Tools

3. Select Instant Forms

Or access it directly from your ad when creating a Lead Generation campaign.

Step 2: Create or Duplicate a Form

1. Click Create Form

You can choose either option:

• Create a new form

• Duplicate an existing form

Duplicating is useful if you want to reuse an existing form structure.

Step 3: Navigate to Form Settings

After selecting the form template, scroll down to the Settings section.

Inside Settings, locate:

Tracking Parameters

This is where hidden values are configured.

Step 4: Add Hidden Tracking Parameters

Click Tracking Parameters and add your key-value pairs.

Example configuration:

This means every lead submitted from this form will automatically include:

model = R18
lead_source = fb

Step 5: Publish the Form

After adding the parameters:

1. Click Publish

2. Use the form in your Lead Generation campaign

All leads generated will now include these hidden fields.

What Happens to the Data?

When a lead submits the form, the tracking parameters are attached to the lead data.

Example lead record:

These fields will appear when:

• Exporting leads from Meta

• Sending leads via API

• Integrating with CRM or marketing automation platforms

Best Practices for Tracking Parameters

Use tracking parameters to capture:

Product Interest

model = R18
model = R1250GS

Campaign Source

lead_source = fb
lead_source = instagram

Campaign Type

campaign_type = test_ride
campaign_type = brochure

This helps marketing teams:

• Segment leads

• Route leads correctly

• Personalize follow-up emails

• Measure campaign performance

Example Use Case

A motorcycle brand runs a test ride campaign for the R18 model.

Instead of asking the user which model they are interested in, the form automatically includes:

model = R18
lead_source = fb

When the lead arrives in the CRM or marketing automation platform, the system can:

• Route the lead to the correct dealer

• Send an R18 brochure email

• Track campaign performance

Summary

Using Tracking Parameters in Meta Lead Ads allows marketers to:

• Add hidden fields

• Capture campaign metadata

• Track lead sources and product interest

• Improve lead routing and reporting

All without adding extra fields to the user form.