Stack · WordPress plugin

MC4WP: Mailchimp for WordPress

version 4.14.0· 1.0M+ active installsView on WordPress.org

About MC4WP: Mailchimp for WordPress

Allowing your visitors to subscribe to your newsletter should be easy. With this plugin, it finally is.

This plugins helps you grow your email list in Mailchimp. You can use it to create good looking and accessible sign-up forms or integrate with any other existing form on your WordPress site, like your contact, comment or checkout form.

Some (but not all) features

Connect with your Mailchimp account in seconds.
Sign-up forms which are good looking, user-friendly and mobile optimized. You have complete control over the form fields and can build your forms using native HTML.
Seamless integration with the following plugins:
- WordPress Comment Form
- WordPress Registration Form
- Contact Form 7
- WooCommerce
- Gravity Forms
- Ninja Forms 3
- WPForms
- BuddyPress
- MemberPress
- Events Manager
- Easy Digital Downloads
- Give
- UltimateMember
- HTML Forms
- AffiliateWP
Is the plugin you want to integrate with not listed above? You can probably still use our custom integration feature. Alternatively, the plugin comes with a PHP API to programmatically add a new subscriber to Mailchimp.
Mailchimp for WordPress Premium: Send your WooCommerce orders to Mailchimp so you can see exactly what each subscriber purchased and how much revenue your email campaigns are generating.
A multitude of available add-on plugins and integrations:
Well documented through our knowledge base.
Developer friendly. For some inspiration, check out our repository of example code snippets.
Ready for PHP 8.5, but backwards-compatible all the way down to PHP 7.4.

What is Mailchimp?

Mailchimp is a newsletter service that allows you to send out email campaigns to a list of email subscribers. It is free for lists with up to 500 email subscribers, which is why it is the newsletter-service of choice for thousands of small businesses across the globe.

If you are not yet using Mailchimp, creating an account is 100% free and only takes you about 30 seconds.

Support

If you need some help in setting up the plugin, you have various options:

Search through our knowledge base.
Open a topic in the WordPress.org plugin support forums
If you’re a premium user, send an email to the email address listed inside the plugin.

Translations

You can help translate this plugin into your language using your WordPress.org account.

Development

This plugin is being developed on GitHub. If you want to collaborate, please look at ibericode/mailchimp-for-wordpress.

Customizing the plugin

The plugin provides various filter and action hooks that allow you to modify or extend the default behavior. We’re also maintaining a collection of sample code snippets.

Quick facts

Latest version4.14.0

AuthorDanny van Kooten

Active installs1.0M+

Rating4.8 / 5 (1,496 reviews)

Requires WordPress5.3+

Requires PHP7.4+

Tested up to7.0.3

Last updated2026-08-04 11:21am GMT

First released2013-06-19

Contributors

ibericode, Danny van Kooten, Harish Chouhan, Lap

How Sourcemap Explorer detects MC4WP: Mailchimp for WordPress

MC4WP: Mailchimp for WordPress sits at v4.14.0 with 1.0M+ active installs, a 4.8/5 rating from 1,496 reviews, tested up to WordPress 7.0.3. Its last wp.org update landed 2026-08-04 11:21am GMT, and it has been on the directory since 2013-06-19. Whatever the install count, every site running it serves the plugin's files from the same predictable location — and that is the signal Sourcemap Explorer reads.

WordPress plugins all load assets from a predictable path: /wp-content/plugins/<slug>/. Sourcemap Explorer enumerates every such URL on the rendered page (script tags and stylesheets) and pulls the version from the ?ver= cache-buster query parameter when WordPress emits one. The slug is then cross-referenced against the wordpress.org plugin directory to attach the human-readable name, author, install count, rating and changelog you see on this page.

1
Find /wp-content/plugins/mailchimp-for-wp/ in the Network tab
Open DevTools → Network → reload the page. Filter by "JS" or "CSS" and look for asset URLs starting with `/wp-content/plugins/mailchimp-for-wp/`. Each match confirms the plugin is loading on the page. Sourcemap Explorer enumerates every plugin path automatically and lists each one in the popup's Stack tab.
2
Read the version from the ?ver= query string
WordPress appends the plugin version as a cache-busting query parameter to its asset URLs (`?ver=4.14.0`). Sourcemap Explorer pulls this version directly. The version on this page (4.14.0) is the latest published on wp.org — the version on a real site may lag.
3
Cross-reference with wp.org for human-readable metadata
Once the plugin slug is identified, fetch `https://api.wordpress.org/plugins/info/1.2/?action=plugin_information&request[slug]=mailchimp-for-wp` to read the human-readable name, author, install count, rating and changelog. This page already does that for you.

Plugin ecosystem context

A WordPress newsletter / email-marketing plugin (MailPoet, Mailchimp for WP, Newsletter, Sendinblue). These ship subscription-form widgets and integrate with vendor APIs. Within that group, MC4WP: Mailchimp for WordPress (1.0M+ active installs) is tagged email, form, mailchimp, newsletter on wp.org.

Screenshots

Installation

Installing the plugin

In your WordPress admin panel, go to Plugins > New Plugin, search for Mailchimp for WordPress and click “Install now“
Alternatively, download the plugin and upload the contents of mailchimp-for-wp.zip to your plugins directory, which usually is /wp-content/plugins/.
Activate the plugin
Set your API key in the plugin settings.

Configuring Sign-Up Form(s)

Go to Mailchimp for WP > Forms
Select at least one list to subscribe people to.
(Optional) Add more fields to your form.
Embed a sign-up form in pages or posts using the [mc4wp_form] shortcode or Gutenberg block.
Show a sign-up form in your widget areas using the “Mailchimp Sign-Up Form” widget.
Show a sign-up form from your theme files by using the mc4wp_show_form() PHP function.

Need help?

Please take a look at the MC4WP knowledge base first.

If you can’t find an answer there, please look through the plugin support forums or start your own topic.

FAQ

Where can I find my Mailchimp API key?

You can find your Mailchimp API key here

How to display a form in posts or pages?

Use the [mc4wp_form] shortcode or the Gutenberg block.

How to display a form in widget areas like the sidebar or footer?

Go to Appearance > Widgets and use the Mailchimp for WP Form widget that comes with the plugin.

How to add a sign-up checkbox to my Contact Form 7 form?

Use the following shortcode in your CF7 form to display a newsletter sign-up checkbox.

[mc4wp_checkbox "Subscribe to our newsletter?"]

Our knowledge base has more information on connecting Contact Form 7 and Mailchimp.

The form shows a success message but subscribers are not added to my list(s)?

If the form shows a success message, there is no doubt that the sign-up request succeeded. Mailchimp could have a slight delay sending the confirmation email though. Please check again in a few minutes (sometimes hours) and don’t forget to check your junk folder too.

When you have double opt-in disabled, new subscribers will be seen as imports by Mailchimp. They will not show up in your daily digest emails or statistics. We always recommend leaving double opt-in enabled.

How can I style the sign-up form?

You can use custom CSS to style the sign-up form if you do not like the themes that come with the plugin. The following selectors can be used to target the various form elements.

.mc4wp-form { ... } /* the form element */
.mc4wp-form p { ... } /* form paragraphs */
.mc4wp-form label { ... } /* labels */
.mc4wp-form input { ... } /* input fields */
.mc4wp-form input[type="checkbox"] { ... } /* checkboxes */
.mc4wp-form input[type="submit"] { ... } /* submit button */
.mc4wp-alert { ... } /* success & error messages */
.mc4wp-success { ... } /* success message */
.mc4wp-error { ... } /* error messages */

You can add your custom CSS to your theme stylesheet or (easier) by using a plugin like Simple Custom CSS

How do I show a sign-up form in a pop-up?

We recommend the Boxzilla pop-up plugin for this. You can use the form shortcode in your pop-up box to show a sign-up form.

How do I subscribe from my WooCommerce checkout form?

You can use our WooCommerce integration for that. How to subscribe to Mailchimp from the WooCommerce checkout form.

How to connect my WooCommerce store with Mailchimp?

You can find instructions for connecting your WooCommerce store with Mailchimp on our website.

I’m getting an “HTTP Error” when trying to connect to Mailchimp.

the “HTTP Error” type is usually because of a firewall configuration issue or outdated software on your web server.

Please contact your webhost and ask them to check the following:

Whether remote HTTP requests to https://api.mailchimp.com are allowed.
Whether cURL and the PHP-cURL extension are installed and updated to a recent version.

Where do I report security bugs found in this plugin?

Please report security bugs found in the source code of the Mailchimp for WordPress plugin through the Patchstack Vulnerability Disclosure Program. The Patchstack team will assist you with verification, CVE assignment, and notify the developers of this plugin.

My question is not listed here.

Please search through our knowledge base.

Changelog

4.14.0

Release date: Aug 4, 2026

Integrations: Show the sign-up checkbox on the admin “Add New User” form. Thanks arnelap!
Misc: Add a code snippet for sending the WordPress username to Mailchimp with User Sync.
Misc: Update WordPress Coding Standards to 3.4 and fix a few incorrect type annotations.

4.13.1

Release date: Jun 22, 2026

Forms: Improve handling of pasted <form> wrapper tags in form content.
Forms: Remove mc4wp_default_form_id option. We now default to first available form.
Forms: Improve the {email} dynamic content tag by detecting common lowercase email field names.
Misc: Adhere to DB, Security, I18n sniffs from WordPress Coding Standards.
Misc: Prevent direct access to plugin configuration files.
Misc: Remove the plugin review request from the footer of plugin admin pages.
Security: Add Patchstack vulnerability disclosure instructions to the plugin FAQ and security policy.

4.13.0

Release date: Jun 1, 2026

Improve performance by preloading core plugin classes and skipping dynamic content tag parsing when no tags are present.
Improve security for admin AJAX requests by adding a nonce check and stricter audience ID handling.
Improve dynamic content tag replacement by removing broken regular expressions.
Improve form preview output by disabling PHP error display during preview rendering.
Update JavaScript dependencies and pass admin script data using wp_add_inline_script().

4.12.6

Release date: May 26, 2026

Fix integrations losing runtime options like double opt-in when sign-up attempts are processed asynchronously. Thanks Jon Parker!
Fix Site Tracking Pixel setting not being saved when disabling it.
Improve accessibility of generated form fields by wrapping inputs in labels and using fieldsets for checkbox and radio fields.
Improve validation and sanitization of submitted form data.
Improve debug log safety by truncating overly long messages and improving email address obfuscation. Thanks Jack Feldcher!

4.12.5

Release date: May 8, 2026

Fix fatal error on plugin activation in some cases when wp_rand() returns a value below 10 for the minute part. Thanks Tim Carr!

View the full changelog on GitHub

Detected by Sourcemap Explorer

We enumerate every /wp-content/plugins/mailchimp-for-wp/ path on the page, and pull the version from the ?ver= query string when WordPress emits one (wp.org currently lists v4.14.0, updated 2026-08-04 11:21am GMT).

Install free on Chrome