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FormSubmit

Kit (ConvertKit) integration

Add form subscribers to Kit (ConvertKit)

Subscribe people who fill your form to Kit, and optionally add them to a Kit form or tag to trigger sequences. FormSubmit uses the Kit v4 API with your own API key.

How to connect Kit (ConvertKit)

  1. 1

    In Kit, go to Settings → Developer and create a v4 API key.

  2. 2

    Optionally note the ID of the Kit form or tag you want to add subscribers to.

  3. 3

    In FormSubmit, open your form → Integrations → Kit and paste the key (and form/tag IDs).

  4. 4

    Send a test to confirm the subscriber appears in Kit.

What FormSubmit sends

  • email_address and first_name
  • Form subscription (optional)
  • Tag (optional)

You'll need

  • Kit v4 API keyencrypted
  • Email field name (optional)
  • Kit form ID (optional) (optional)
  • Kit tag ID (optional) (optional)

Included on every plan, including Free. Failed deliveries are retried automatically with backoff and every attempt is shown in your delivery log.

Frequently asked questions

Can I trigger a Kit sequence?

Yes — add subscribers to a Kit form or tag that starts the sequence.

Related

Kit (ConvertKit)

Subscribe people to Kit and optionally add them to a form or tag.

Newsletter signup forms for any site

Add signup forms that subscribe people to Mailchimp or Kit directly — styled exactly like your site.

Mailchimp integration

Add or update subscribers in a Mailchimp audience.

Connect your forms to Kit (ConvertKit) in a minute

Sign in with Google, create a form, paste the endpoint. Free forever for small sites — no credit card.

Get started free Read the docs