LanderLab allows you to automatically prefill fields in your quizzes and forms using URL parameters. This feature helps personalize the experience for your visitors and increases conversions by filling in information you already have.
This functionality is enabled by default. All you need to do is make sure the input field’s Name matches the parameter in your URL.
How Prefill Works
Good to know: Matching is not case-sensitive. A parameter like ?zip=12345 will match zip, Zip, ZIP, and similar variations.
When a visitor arrives at your quiz with a parameter in the URL (for example ?zip=12345), LanderLab looks for an input field whose Name matches the parameter. If found, the value is automatically inserted into the field.
Step-by-Step Guide
Follow these steps to set up prefilled fields:
- Identify the parameter you want to pass in your URL.
- Open your quiz in LanderLab and select the input you want to prefill.
- Set the input’s Name to match your URL parameter.
- Publish your page and test using a live URL.
Example
URL: https://yourlandingpage.com/?zip=12345
- Parameter:
zip - Value:
12345 - Input Name Should Be:
zip,Zip,ZIP, etc.
Tip: As long as your input’s Name matches the parameter (case-insensitive), LanderLab will automatically prefill the field when the page loads.
Common Use Cases
- Prefill a zipcode for location-based funnels, e.g.
?zip=90210 - Prefill an email from your newsletter links, e.g.
[email protected] - Pass hidden tracking parameters like affiliate IDs using
?aff_id=123
Important Notes
Warning: Avoid using URL parameters to pass sensitive data such as passwords, SSNs, medical information, or anything that must remain private.
- Make sure your input Name has no trailing spaces.
- URL parameters must be valid and properly encoded.
- Prefill works only on the live page — not inside the builder preview.