Learn how to verify that sign-up form functionality is enabled on your website. This makes sure that sign-up forms published in Klaviyo display as expected on your site and sync all necessary data to Klaviyo.

Learn about Klaviyo's onsite JavaScript (Klaviyo.js), which is the code snippet that you paste on your site to enable Active on Site tracking, and its impact on site speed. Klaviyo.js needs to be installed in order for you to publish Klaviyo sign-up forms on your website.

Learn troubleshooting tips for when a sign-up form in your Klaviyo account is not working as expected by reviewing common issues and solutions to these issues.

Learn why the number of subscribers in your Klaviyo list doesn't match the number of submissions in your form, as well as how to find each of these numbers.