ConvertKit makes it easy to capture more leads and sell more products by easily
embedding email capture forms anywhere. This plugin makes it a little bit easier for those of us using WordPress
blogs, by automatically appending a lead capture form to any post or page.

If you choose a default form on the settings page, that form will be embedded at the bottom of every post or page
(in single view only) across your site. If you wish to turn off form embedding or select a different form for
an individual post or page, you can do so within the ConvertKit meta box on the editing form.

Finally, you can insert the default form into the middle of post or page content by using the [convertkit] shortcode.

Full plugin documentation is located here


  • Insert modal forms into any post
  • Add stunning landing pages


  1. Upload wp-convertkit to the /wp-content/plugins/ directory
  2. Activate the plugin through the ‘Plugins’ menu in WordPress
  3. Visit the settings page by clicking on the link under the plugin’s name
  4. Enter your ConvertKit API key, which you can find here, and save the settings
  5. Select your default form and save the settings
  6. If you wish, choose particular forms for each post or page by visiting the edit screen and choosing the correct form


Does this plugin require a paid service?

Yes, for it to work you must first have an account on


June 10, 2020
Since I'll start paying 30 bucks a month after my trial is over, I'd expect a better piece of software. ConvertKit help documentation is good. The staff is good, they are responsive, and it looks like they take great care of their customers. That being said, I spent about 45 minutes trying to understand why the plugin wasn't showing the dozens of changes I made on CK's website. I had to manually refresh the forms in WordPress, clear the cache (a not-so invasive Plugin, the Siteground official one), and pray. When I did all three, sometimes I would see the changes on my website. If it was a free plugin that would be ok. But for about $350/year service, I'm expecting a plugin that works out of the box.
May 8, 2020
I created an account installed in the plugin. Added inline form shortcode, it didn't work. I'm able to see the form in preview mode but if I use an incognito or a different browser, the form is missing. I checked their knowledge-base. Tried everything. Nothing worked. Update: The team was really responsive and the form wasn't working due to my Cache plugins. They figured it out within 2 hours.
October 5, 2019
I'm actually shocked by how difficult it is to do simple things like customize the Forms with Convertkit. You need to know CSS to do simple things like change the fonts in your form, or even just the font size. There is also no option to assign contacts from certain forms to a subscriber tag. Really confused as to why this is regarded as the top email marketing plugin for bloggers, it's missing some really basic stuff.
September 22, 2016
Is there any reason why I can't change any of the colors in the forms? I tried to add it to our custom css section in wordpress and nothing happen. .ck_form.ck_minimal .ck_subscribe_button { width: 100%; color: #000000; margin: 0px; padding: 11px 0px; font-size: 18px; background: #000000; -moz-border-radius: 3px; -webkit-border-radius: 3px; border-radius: 3px; cursor: pointer; border: none; text-shadow: none; width: 30%; float: left; height: 42px; } ck_form.ck_minimal { background: #000000; font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif; line-height: 1.5em; overflow: hidden; color: #000000; font-size: 16px; border: solid 1px #d1d1d1; -webkit-box-shadow: none; -moz-box-shadow: none; box-shadow: none; clear: both; margin: 20px 0px; text-align: center; }
September 3, 2016
Although I use another plugin for my forms for the ConverKit Service, I do like this plugin for quick installation of forms in other areas of my site. It looks nice on three different themes I use.
Read all 6 reviews

Contributors & Developers

“ConvertKit” is open source software. The following people have contributed to this plugin.


“ConvertKit” has been translated into 2 locales. Thank you to the translators for their contributions.

Translate “ConvertKit” into your language.

Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.


1.9.2 2019-12-20

  • Fix issue that prevented Google fonts from loading on landing pages
  • Fix issue that resulted in multiple failed API calls for non-existent subscribers passed in via query parameter

1.9.1 2019-12-20

  • Fix bug that prevented “refresh forms” button on settings page from working

1.9.0 2019-12-17

  • Allow appending forms to WooCommerce products
  • Fix bug that prevented setting “none” for form on a post from overriding category setting
  • Add account name to settings page

1.8.1 2019-05-30

  • Fix bug that could result in fatal error with certain other plugins active
  • Add additional server debug info for tech support

1.8.0 2019-05-30

  • Displays tags/LPs/forms alphabetically
  • Several edge-case bug fixes
  • Removes confusing utf8 warning on settings page

1.7.5 2019-04-30

  • Fix false positive detection of character set issues related to using emojis in forms & landing pages
  • Don’t show error on tools tab on first visit with logging turned on
  • Fix code conflict with some other plugins that resulted in PHP warnings being displayed

1.7.4 2019-03-27

  • Fixed problem with a library that was only compatible with PHP 7+

1.7.3 2019-03-26

  • Adds checks and notices for outdated character set (utf8 vs. utf8mb4) use
  • Add notice to metabox on blog archive page that our plugin does not do anything on this page
  • Update library to make plugin work with PHP 7.3 (previously, landing pages did not work)
  • Fix issue where global default form would never show for some categories
  • Fix include path for system status box on tools tab

1.7.2 2019-02-18

  • Fix bug that caused fatal error on upgrade

1.7.1 2019-02-18

  • Fix bug that caused fatal error on upgrade

1.7.0 2019-02-18

  • New: Significantly improve performance of plugin by only attempting to tag visitors if needed (not on every page)
  • New: Add option to disable javascript entirely (prevents tagging and custom content features from working)
  • Fix conflict with Yoast SEO plugin
  • Fix bug that prevented plugin from working with PHP 7.3
  • Fix bug that prevented changing a category default form back to None
  • Clarify that both API key and secret are required
  • Fix bug that stripped out URL query parameters unrelated to ConvertKit
  • Better handle refreshing list of forms in the connected ConvertKit account

1.6.4 2019-01-18

  • Added tools tab with debug log and system info boxes
  • Fixed a bug that would show a PHP notice in some cases
  • Fixed two bugs that would sometimes result in the custom content feature failing
  • Fixed a bug that would sometimes cause WishList Member integration settings to not save

1.6.3 2019-01-07

  • Fixes issues with Contact Form 7 integration not saving form settings.
  • Adds button to refresh on settings page, to fetch new forms added to the connected ConvertKit account.

1.6.2 2018-07-12

  • Fix for this message when Landing Page is set to None: PHP Notice: Undefined offset: 0
  • Fix for new form builder being used in shortcode with “form” attribute instead of “id”

1.6.1 2018-07-03

  • Fix for landing pages not showing in the admin area drop down
  • Fix for showing new landing pages on the front end of the site
  • Added jquery to landing pages as new landing page builder does not include it

1.6.0 2018-06-30

  • Add support for new form builder
  • Remove unnecessary API calls
  • Store form/landing page/tag data in WP Options
  • Add update routine for refreshing local convertkit data

1.5.5 2018-06-01

  • Fix for error in javascript added to landing pages.
  • Fix for applying tags based on page views on initial visit. This adds an ajax call
    to each visit which some customers expressed concern about. We will add a way to remove this in an upcoming version.

1.5.4 2018-05-19

  • Fix for adding ck_subscriber_id to cookie

1.5.3 2018-03-08

  • Added a default form setting for post categories
  • Clean up logging
  • Remove admin Ajax calls from each page load
  • Remove API calls from the dashboard list posts page
  • Add dependency to JavaScript enqueue to fix JavaScript error on landing pages

1.5.2 2017-11-30

  • Fixed plugin settings link
  • Added JavaScript subscriber tagging to landing pages

1.5.1 2017-10-31

  • Fixed encoding of JavaScript.
  • Fixed localisation of data.
  • Removing console.log from JS.

1.5.0 2017-10-13

  • Added saving subscriber_id after visitor fills out ConvertKit form
  • Added saving subscriber_id when visitor lands on site from ConvertKit email link
  • Added “Add a tag” to Posts/Page metabox
  • Added convertkit_content shortcode to show content to subscribers who have a tag

1.4.10 2017-10-04

  • Removed transient for API calls.
  • Changed widget to use option setting instead of making API call.
  • Reduced number of API calls while site is being browsed.
  • Updated contributors

1.4.9 2017-07-24

  • Fix _get_meta_defaults() because Posts and Pages set to Default were not showing forms.
  • Updated ConvertKit_API::_get_api_response() to inflate response body if necessary.

1.4.8 2017-07-13

  • Fixed API response not getting unzipped
  • Added check for multibyte string PHP extension
  • Fixed CF7 mapping not showing all forms
  • Changed log file to write locally instead of using WP_Filesystem

1.4.7 2017-06-01

  • Code refactor with WordPress Code Standards
  • Added ability to tag a customer when WishList Member membership lapses
  • Added WishList Member tag a customer
  • Removed curl and replaced with wp_remote_request

1.4.6 2017-03-29

  • Fix for landing pages not appearing.
  • Added code to API to not return status_code 404 content

1.4.5 2017-03-28

  • Uncommented logging around API calls.
  • Do not show 404 page content when shortcode is used with form ID that does not exist
  • If ConvertKit API is unavailable, fail gracefullyl
  • Fix for Contact Form 7 message sending when no ConvertKit forms are mapped
  • Removed archived forms from the list of available forms in settings page


  • Added i18n support
  • Added Contact Form 7 integration. Site admins can now map CF7 name and email fields to CK subscription.
  • Verified functionality with latest version of WishlistMember


  • Add WP widget for form
  • Updates form version to v6
  • Add logger to help troubleshoot issues
  • Add link to CK account if no forms available
  • Add notice if can’t connect to API


  • Fixed issue with WishlistMember integration where members were not being subscribed.


  • Add upgrade routine to change ID to form_id for API version 3.0


  • Update ConvertKit API to version 3.0


  • Fix WishList Member email sent to CK API when shopping basket used.


  • Fix crash when API response is slow


  • Avoid calling API endpoints when no forms need to be shown


  • Fixes issue with illegal offset showing warning message


  • Fix bug showing warning messages for some users


  • Fix bug showing error messages for some users


  • Updated for compatibility with WordPress 4.3


  • Another fix for a pesky bug causing syntax errors


  • Fixes a bug causing syntax error when getting options


  • Added WishList Member integration
  • Updated API methods


  • Fixed a warning that appeared sometimes when no forms were loaded.


  • Updated to use responsive forms


  • Initial release