How to Connect Kit (formerly ConvertKit) to a WordPress Form?

Key Takeaways

  • Nexter Blocks includes a Form block that connects to Kit (formerly ConvertKit) for automatic form submission integration.
  • Users must obtain their Kit (formerly ConvertKit) API Key from the Developer settings to connect with Nexter Blocks.
  • Disabling Double-Opt-in in Kit (formerly ConvertKit) allows users to be added automatically without manual approval.
Table of Contents

Want to grow your email list by connecting your WordPress form to Kit (formerly ConvertKit)? With this integration, you can automatically send form submissions to your Kit account, and streamline your marketing efforts.

With the Form block from Nexter Blocks, you can easily connect your Kit (formerly ConvertKit) account to your WordPress form.

To check the complete feature overview documentation of the Nexter Blocks Form block, click here.

Requirement  – This block is a part of the Nexter Blocks, make sure it’s installed & activated to enjoy all its powers.

Learn via Video Tutorial

YouTube video

For this, you must have the Kit (formerly ConvertKit) API Key.

Get Kit (formerly ConvertKit) API Key

Create an account in Kit (formerly ConvertKit) if you don’t already have one. Once you are logged into your account, follow the steps – 

1. Click on the user profile on the top right.

2. Then click on Settings from the dropdown.

3. On the next page, click on the Developer in the left menu.

4. On the screen, you’ll have your API Key.

convertkit api

Create a Form in Kit (formerly ConvertKit)

Now you have to create a form in Kit (formerly ConvertKit). To do this, follow the steps – 

1. From the Kit (formerly ConvertKit) dashboard, go to Grow > Landing Page & Forms.

2. Then, on the next page, click on the Create a Form button.

3. On the next page, select any form type.

4. After that, select a form template. 

5. Then click on the Publish button on the next page.

Note: Make sure to disable Double-Opt-in in your form so users can be added automatically, otherwise, you have to manually approve each user. 

Use the Form Block

Now, add the Form block to the page and select the appropriate form type, then follow the steps –

1. Add the required form fields and customize them as per your requirements.

2. Then select the main form block and go to the Action After Submit tab and select ConvertKit from the Options dropdown.

3. Now you’ll see the ConvertKit tab, open it.

4. Then add your API key in the Custom API Key field.

Now, when a user fills out your form, they will be automatically added to your Kit (formerly ConvertKit) contact list.

About the Author

Photo of Aditya Sharma CMO of NexterWP
CMO at POSIMYTH Innovations · NexterWP · 7 years experience

He has spent years in the WordPress ecosystem building, breaking, and optimizing sites until they actually perform. He works at the intersection of speed, growth, and usability, helping creators ship websites that load fast and convert. An active WordPress community contributor sharing through tools, tutorials, and direct collaboration. Tested practice, not theory.

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Related Frequently Asked Questions

What should I do if my Kit (formerly ConvertKit) API key is not working?

If your Kit API key is not working, double-check that you have copied it correctly from the Developer settings in your Kit account. Ensure you are using the correct API key for your account and that it has not been regenerated or invalidated. If issues persist, consider creating a new API key and updating it in the Form block settings.

What is the best practice for setting up forms in Kit (formerly ConvertKit)?

A best practice when setting up forms in Kit is to disable the Double-Opt-in feature. This allows users to be added automatically to your contact list without needing manual approval, streamlining the process and enhancing user experience. Make sure to communicate this clearly to your users to avoid confusion.

What happens if I forget to add my API key in the Form block?

If you forget to add your API key in the Form block, form submissions will not be sent to your Kit (formerly ConvertKit) account. This means that any leads generated through your WordPress form will not be captured, which can hinder your email marketing efforts. Always ensure the API key is correctly entered in the Custom API Key field.

Is there a limit to the number of submissions I can send to Kit (formerly ConvertKit) from my WordPress form?

The page does not specify any limits on the number of submissions you can send to Kit from your WordPress form. However, it's important to check Kit's own policies regarding submission limits and ensure your account is in good standing to avoid any disruptions in service.

How do I create a form in Kit (formerly ConvertKit) for my WordPress site?

To create a form in Kit, log into your Kit account, navigate to Grow > Landing Page & Forms, and click on the Create a Form button. Choose a form type and template, then publish it. After that, you can integrate it with your WordPress site using the Form block from Nexter Blocks to streamline your email list growth.

Last reviewed: April 14, 2026

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