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The marketer's guide to creating sign-up forms with Composer

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Build and refine sign-up forms with Composer

Generated by Klaviyo AI

Learn how Composer, Klaviyo’s AI marketing agent, creates and edits web sign-up forms from plain-language requests. The guide covers refining offers and messaging, preparing variations for testing, and reviewing drafts before publishing in Klaviyo.

  • Prompt-based creation: Describe your offer, intended audience, and preferred tone so Composer can create a draft web sign-up form.
  • Existing form updates: Ask Composer to rewrite copy, adjust tone, or change promotional offers without rebuilding an existing form.
  • Messaging experiments: Use Composer to prepare different offers and messages, then evaluate results with Klaviyo’s supported form testing and analytics capabilities.
  • Review before publishing: Verify copy, offers, audience, display behavior, and consent settings in Klaviyo’s form editor, since Composer never publishes automatically.
  • Supported form types: Composer supports web sign-up forms, but not in-app forms, back-in-stock forms, or landing pages.
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Growing your email list starts with giving shoppers a reason to subscribe. Maybe it's 10% off their first order, early access to a product launch, or an invitation to join your VIP list. The idea is simple. Turning it into a sign-up form that looks right, says the right thing, and is ready for customers takes more work.

With Composer, Klaviyo's AI marketing agent, you can create and edit web sign-up forms by describing what you want in plain language. Ask Composer to build a popup for new subscribers, update the offer on an existing form, or rewrite the copy to better reflect your brand.

Instead of starting from scratch in a form editor, you can go from an idea to a draft form in one conversation, then review and publish it in Klaviyo.

Why use Composer to create sign-up forms?

List growth is fundamental to email marketing. More subscribers means more opportunities to build relationships, introduce products, and turn first-time visitors into customers.

But creating a sign-up form traditionally involves several steps: choosing a form type, writing the headline and offer, configuring fields, and adjusting the design. Even a small change to an existing form can mean navigating back into the editor.

Composer makes that process more conversational.

You can describe what you're trying to accomplish, let Composer handle the initial creation, and then ask for changes without starting over.

That means less time spent on repetitive setup and more time experimenting with the messages and offers that encourage shoppers to subscribe.

Create a sign-up form from a single prompt

You don't need to start with a blank form or figure out every detail before you begin.

Tell Composer what you want to create and why. Include the offer, the audience you're trying to reach, and the tone you'd like to use.

Create a popup sign-up formCreate a popup sign-up form offering 10% off a first purchase for new email subscribers. Keep the messaging friendly and focused on the offer.

Composer uses your request to create a draft Klaviyo web sign-up form, giving you a starting point you can review and refine before publishing.

You can also start with a broader goal.

Create an early access sign-up formCreate a sign-up form encouraging shoppers to join our email list for early access to new product launches.

The more context you provide about your goal, the more clearly you can communicate what you want Composer to build.

And because you're working in a conversation, you can keep refining your request rather than starting from scratch every time an idea changes.

Edit an existing form without starting over

Creating a form is only part of growing your list. You also need to keep your messaging fresh as your promotions, products, and priorities change.

Maybe your welcome discount has changed. Maybe your current headline doesn't communicate enough value. Or perhaps you want to reposition your newsletter as a VIP experience.

Composer can now help edit existing Klaviyo web sign-up forms, too.

Update my footer sign-up formUpdate my footer sign-up form headline to say "Join the VIP list" and make the supporting copy feel more exclusive.
Update my sign-up form offerUpdate the offer on my existing sign-up form from 15% off to 10% off and adjust the copy to match.

Instead of rebuilding the form, you can describe the change you want and have Composer help make it.

This makes it easier to keep sign-up forms aligned with your current marketing strategy, whether you're refreshing an evergreen offer or updating messaging for a new promotion.

Experiment with different offers and messaging

The first version of a sign-up form doesn't have to be the last.

A discount might appeal to first-time shoppers, while early product access or exclusive updates might resonate more with loyal customers.

Composer makes it easier to explore different messaging approaches, so you can spend less time rewriting copy and more time thinking about what motivates your audience.

Rewrite my sign-up form headlineRewrite my sign-up form headline to focus on getting early access to new arrivals instead of a discount.
Edit the copy on my sign-up formMake the copy on my existing sign-up form shorter, more direct, and focused on why someone should subscribe.

You can use these changes as the starting point for experiments in Klaviyo, comparing how different messages and offers influence sign-up performance.

The goal isn't just to create forms faster. It's to make improving them a more natural part of your marketing workflow.

Review and publish when you're ready

Composer helps you build and edit sign-up forms, but you stay in control of what goes live.

When Composer creates a form, it saves it as a draft. You can review the form in Klaviyo's form editor, make any final adjustments, and publish it when you're ready.

Nothing is automatically published by Composer.

Before publishing, check a few important details:

  • Check the offer: Confirm that discounts, promotional details, and eligibility conditions are accurate.
  • Review the copy: Make sure the headline and supporting messaging sound like your brand.
  • Verify the form settings: Check the relevant audience, display behavior, and subscription or consent settings.
  • Review the experience: Make sure the form gives shoppers a clear reason to subscribe and sets the right expectations.

Composer handles the initial work so you can focus on the customer experience and decide when it's ready to launch.

How to get started with sign-up forms in Composer

  1. Describe your goal. Open Composer and explain the web sign-up form you want to create or the existing form you'd like to update.
  2. Include the details. Share your offer, intended audience, and preferred messaging.
  3. Review the draft. Check the generated or updated form to make sure it reflects your request.
  4. Refine the messaging. Ask Composer to adjust the copy, change the offer, or make the tone more consistent with your brand.
  5. Publish in Klaviyo. Open the draft in the form editor, verify the settings, make any final changes, and publish when you're ready.

You don't need a perfectly written prompt to get started. Describe what you're trying to accomplish the way you'd explain it to a marketing teammate.

Get started now

Your next list-growth opportunity might be one conversation away.

Whether you're launching a new subscriber offer or refreshing a form that's already on your site, Composer helps you go from an idea to a Klaviyo web sign-up form faster.

Explore Composer and try creating your next sign-up form with a prompt.

Frequently asked questions

Can Composer create Klaviyo sign-up forms?

Yes. Composer, Klaviyo's AI marketing agent, can create web sign-up forms from a natural-language prompt. Describe the form you want, the offer you're promoting, and the messaging you'd like to use, and Composer can build a draft in Klaviyo.

What types of forms can Composer create?

Composer currently supports web sign-up forms. In-app forms, back-in-stock forms, and landing pages aren't supported yet.

Can Composer edit my existing sign-up forms?

Yes. Composer can make changes to existing Klaviyo web sign-up forms, including updates to their copy and promotional offers. You can describe the change you want in plain language instead of rebuilding the form.

Does Composer automatically publish sign-up forms?

No. Composer saves forms as drafts. You review the form, make any final adjustments, and publish it from Klaviyo's form editor. Nothing goes live automatically.

Do I need to know how to build a form in Klaviyo to use Composer?

You don't need to start in the form editor to create a form with Composer. Simply explain what you want to build, such as a popup offering new subscribers 10% off, and Composer can handle the initial creation. You'll use the form editor to review and publish the draft.

Can Composer help me improve my sign-up form copy?

Yes. Ask Composer to rewrite a headline, adjust the tone, or update the messaging on an existing form. For example, you might ask it to make your sign-up copy shorter or focus on an exclusive subscriber benefit.

Can Composer help me test different sign-up offers?

Composer can help you update a form's messaging and offers, making it easier to prepare different approaches for testing. You can then use Klaviyo's supported form testing and analytics capabilities to evaluate results.

Do I still need to review forms created by Composer?

Yes. Review your form's copy, offers, settings, and customer experience before publishing. AI-generated content can contain inaccuracies, so it's important to verify the details.