How to Add a Newsletter Signup Form to Your Website

Every email platform hands you a snippet: Mailchimp under Forms > Other forms > Create embedded form, Kit through the Embed button in its form builder, beehiiv from its Subscribe Forms page. Paste that snippet into an HTML or code block where the form should sit, publish, and send yourself a test signup.

Where each provider keeps its embed code
Provider	Path to the code	Code type
Mailchimp	Forms > Other forms > Create new form > Create embedded form	HTML form
Kit	Open the form > Embed (top right) > JavaScript or HTML tab	Script (recommended) or HTML
beehiiv	Subscribe Forms page > choose a form > embed options	HTML snippet (full or fixed width)

Updated October 28, 2026

The provider you choose decides the form's code, and the platform you build on decides where that code may go. Mailchimp gives you a plain HTML form you can restyle. Kit recommends its script version because edits made in Kit show up on your site automatically. beehiiv's embed is an iframe-style snippet sized full or fixed width.

Add a newsletter signup on We.Inc, WordPress, Wix, Squarespace or plain HTML

We.Inc

Using beehiiv? Open the ... menu, choose Add-ons, fill in the beehiiv embed field, switch it on, then ask the AI chat where to place it.
Using Mailchimp or another list tool with a form the AI built? Open that form's 'Send entries to' settings and connect the Mailchimp card (or Kit, MailerLite, Brevo and others).
Make sure the form has a marketing consent tick box; only people who tick it are sent to your email tool.
On a paid account, the Apps panel also has a Newsletter app if you would rather keep subscribers inside We.Inc.
Publish and submit a test address on the live site, since forms do not capture in preview.

WordPress

Copy the embed code from your provider.
Edit the page and add a Custom HTML block where the form belongs.
Paste the code and click Update.
For Kit or beehiiv, you can instead install their official plugin from Plugins > Add Plugin and use its form block.

WordPress.com removes script tags unless your site is on a paid plan with plugins and hosting features active, so Kit's JavaScript embed will not run on a free site. Mailchimp's plain HTML form is the safer fit there.

Wix

In the Editor, click Add Elements, then Embed Code, then Embed HTML.
Click Enter Code, paste the provider's snippet and click Apply.
Drag the frame to size; Wix shows embeds in an iframe, so allow enough height for the success message.
Publish and test the form on the live site.

Squarespace

For Mailchimp, add a Newsletter block, open its Storage tab and connect Mailchimp.
For Kit or beehiiv, add a Code block and paste their snippet.
Save, then submit a test address from the published site.

Mailchimp storage on the newsletter block, and scripts in code blocks, both need the Core, Plus or Advanced plan.

Plain HTML

Paste the provider's code where the form should appear, usually inside a <section> near the footer.
Override its styles in your stylesheet so it matches your fonts and buttons.
Leave the hidden fields Mailchimp adds (they include a bot trap) exactly as they are.

Sources

Checked October 28, 2026: the newsletter form pages we read.

Mailchimp steps for an embedded signup form: https://mailchimp.com/help/add-a-signup-form-to-your-website/
Kit's guide to the JavaScript and HTML form embeds: https://help.kit.com/en/articles/4009572-form-embedding-basics
beehiiv's article on creating an embedded subscribe form: https://www.beehiiv.com/support/article/12977090590487-creating-an-embedded-subscribe-form
Squarespace newsletter blocks and Mailchimp storage: https://support.squarespace.com/hc/en-us/articles/205815508-Using-Mailchimp-with-Squarespace
WordPress.com rules for script tags in Custom HTML: https://wordpress.com/support/wordpress-editor/blocks/custom-html-block/
Wix Embed HTML element and its iframe behaviour: https://support.wix.com/en/article/wix-editor-embedding-a-site-or-a-widget

Pick the provider for the job

Mailchimp suits shops and local businesses that want automations tied to an online store. Kit is built around creators selling digital products. beehiiv is built for publishers who want a web archive of issues, a referral programme and ad monetisation.

Whichever you choose, write the first welcome email before the form goes live, so new subscribers hear from you while they still remember signing up.

How it works

Create the audience or publication in your email tool.
Build the form there: email field, optional first name, a consent line.
Copy the embed code the tool generates.
Paste it into the page, footer or blog sidebar of your site.
Submit a real address on the live site and confirm the double opt-in email arrives.

Tips

Ask for an email address and at most a first name. Each extra field costs signups.
Say what people will get and how often, right above the button: 'One email a month with new recipes.'
Keep double opt-in on. It blocks typo addresses and bots from polluting your list.
If you connect Mailchimp through Squarespace's newsletter block, make every Mailchimp field except Email optional, or signups will not arrive.

Frequently asked questions

Is the Mailchimp embedded form free?

Mailchimp's help pages list no plan limit on embedded forms and say you can create as many forms as you need per audience. Your overall contact and send limits still depend on your Mailchimp plan.

Kit gives me JavaScript and HTML versions. Which should I use?

Kit recommends JavaScript: changes made in Kit update on your site automatically and it is less prone to theme style conflicts. Use HTML only if your site cannot run scripts, and re-copy it after every edit.

Why does my embedded form work in preview but not on the live site?

Usually the platform stripped the script on publish (common on free plans), or a cookie or ad blocker is hiding it. Test in a private window without extensions and check your plan allows custom code.

Do I need consent to add people to a newsletter?

In the EU, UK and Canada you need clear opt-in consent for marketing email, so do not pre-tick the box and do not add contact-form senders to your list without asking.

Start for free or see all free tools. We.Inc is free to start, with no card needed. AI building is on paid plans from $20 a month.