Grow Your List with Klaviyo Forms and Popups

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Growing your subscriber list is an essential part of a strong SMS strategy, and Postscript offers several creative ways to add SMS list growth opportunities throughout your marketing efforts.

In this article, we are going to introduce growing your list using Klaviyo forms and popups.

About Klaviyo

Klaviyo forms and popups are effective ways to engage people who visit your website. You can create Klaviyo popups and forms for both a desktop and mobile experience, allowing you to capture visitors from various devices.

  • Create highly customized or branded popups, forms, and website banners.
  • Collect email and phone numbers in one interaction.
  • Create customer segments from specific forms and send targeted welcome series, automations, and campaigns.

Before you can start collecting SMS subscribers, you'll need to create a form or popup in Klaviyo that contains a phone number field.

After you create the form or popup, you'll need to do two things: ensure Postscript is the platform collecting SMS numbers and copy the form or popup ID.


  1. Phone field. Select the phone field in your form or popup. This opens the Phone Number editing menu on the left side of the page.
  2. SMS Consent. In order for SMS subscribers to flow through to Postscript, you need to make sure you've selected Do not collect SMS consent. Otherwise, Klaviyo will collect these subscribers and you won't be able to send them messages from Postscript.
  3. Form ID. You can locate the form or popup ID in the URL of the form. You'll need this ID to link the form or popup in Postscript. For this example, the form ID is KR3KyF.

Once you have the form ID, you can link your form or popup in Postscript. Select Add New Form on your Klaviyo integration page, and enter the form ID. Learn more about linking Klaviyo forms and popups here.

Examples of Klaviyo Forms and Popups

Form Popup
With forms, you can make subscriber collection static. You can embed a form in your website, like the below example, or create a landing page for a special giveaway or event.

Compliance Language Requirements

When collecting subscribers, the TCPA requires you to include necessary compliance language that informs visitors that they are opting into SMS messaging from your store.

Here's the TCPA-approved compliance language:

*I agree to receive recurring automated marketing text messages (e.g. cart reminders) at the phone number provided. Consent is not a condition to purchase. Msg & data rates may apply. Msg frequency varies. Reply HELP for help and STOP to cancel. View our Terms of Service and Privacy Policy.

You should now be all set to grow your list with Klaviyo forms and popups!

Get Support

Have questions? Please feel free to reach out to our wonderful Support team at or via live chat. You can also submit a support request here!

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