Documentation Index
Fetch the complete documentation index at: https://docs.usekinetic.com/llms.txt
Use this file to discover all available pages before exploring further.
Found under Settings → Variables & Hidden Fields in the form builder.
Hidden Fields
Hidden fields capture data invisibly and optionally sync it to Klaviyo profiles. They are not shown to the user but are included in the form submission data.
Source Types
| Source | Description | Example |
|---|
| Klaviyo | Pull from the recipient’s Klaviyo profile | First name, city, custom properties |
| URL parameter | Capture a value from the page URL | ?utm_source=email → captures email |
| Static | A fixed value submitted with every response | Always submits "campaign_2025" |
Presets
Common Klaviyo profile fields are available as one-click presets:
- First Name, Last Name, Email, Phone Number, City, Country, Region
Configuration Options
| Option | Description |
|---|
| Key | The field name used in the submission data |
| Source type | Where the value comes from (Klaviyo, URL parameter, or static) |
| Value | The source value — a Klaviyo Liquid variable, URL param name, or static string |
| Sync to profile | When enabled, pushes the value back to the Klaviyo profile on submission |
| Klaviyo property key | Custom property name when syncing to Klaviyo (e.g. capture as utm_source but store as acquisition_channel) |
| Prefix / Suffix | Prepend or append text to the captured value |
| Fallback | Default value if the source is empty |
{{hidden:key}} in field labels, welcome headlines, or intro text to personalize the form with the captured value.
For example, if you have a hidden field with key first_name sourced from Klaviyo, you can write a welcome headline like:
Hi {{hidden:first_name}}, we have a few questions for you!
The placeholder is replaced at runtime with the actual value. If the value is empty, the fallback is used (or the placeholder is removed).
Hidden fields are useful for tracking attribution (UTM parameters), personalizing the form experience (e.g. greeting users by name), or enriching Klaviyo profiles with data from other sources.
Variables
Variables are numeric values that can be used for scoring and calculations across form pages. They work together with the Logic Builder to create scored quizzes and assessments.
| Option | Description |
|---|
| Name | The variable name (e.g. score) |
| Initial value | The starting value (default: 0) |
