Kajabi Custom Code: What Can and Cannot Be Customised?

Introduction

Kajabi gives you plenty of control without touching code, but there is a point where the standard page builder stops being enough.

That is where Kajabi custom code becomes useful.

You can use custom CSS and JavaScript on individual pages, place code inside Custom Code blocks, add scripts across your website and, on supported plans, work directly with Kajabi theme files. What you cannot do is treat Kajabi like a completely open-source platform where every part of the underlying system is yours to rewrite.

So, how far can you actually customise Kajabi?

What Can You Customise With Kajabi Custom Code?

Kajabi custom code can be used to change the appearance and front-end behaviour of your website, create custom page elements, embed external tools and make deeper changes to supported themes.

Here is the practical difference:

The level of control also depends on where you are trying to make the change.

1. Customise Kajabi Page Design With CSS

Custom CSS is usually the first place to start when the page builder gets close to the design you want but cannot quite finish it.

Kajabi provides page-level custom code settings where CSS can be added without editing an entire theme. Kajabi specifically documents CSS use for areas such as fonts, colours and backgrounds.

CSS can be useful for:

• Applying a custom font
• Changing colours beyond your standard theme settings
• Styling headings, text and buttons
• Creating custom hover states
• Changing borders, shadows and decorative effects
• Refining mobile presentation
• Hiding certain visual elements
• Giving custom sections a more distinctive branded appearance

For example, if a landing page is structurally correct but still looks too close to a standard Kajabi template, carefully written CSS can give it a much more bespoke finish.

Kajabi also supports embedded custom fonts, including fonts brought in through services such as Google Fonts or Adobe Fonts.

When should you use CSS instead of rebuilding the page?

Use CSS when the content and structure already work and the problem is mainly visual.

If you are writing hundreds of lines of CSS simply to force a standard Kajabi section into a completely different layout, a custom section or deeper theme modification may be a cleaner option.

2. Add Custom Functionality With JavaScript

JavaScript goes beyond appearance. It changes how elements on the page behave.

Kajabi lets you add custom JavaScript through page Custom Code settings, Custom Code blocks and site-wide page scripts.

Depending on the requirement, JavaScript may be used for things such as:

• Custom accordions or tabs
• Interactive calculators
• Conditional content
• Custom pop-ups
• Scroll-triggered effects
• Sticky page elements
• Additional form behaviour
• Custom navigation interactions
• Third-party widgets
• Analytics and marketing scripts

The important distinction is that JavaScript is still working within the page Kajabi delivers to the browser.

It can make the front end behave differently, but it does not give unrestricted control over Kajabi's underlying platform.

3. Create Custom Kajabi Sections and Page Elements

You do not always need full Code Editor access to build something custom.

Kajabi's current Page Builder includes Custom Code Sections and blocks, which can be used to insert custom code or embed external content directly into a page. Kajabi gives calendar embeds as one example of how these blocks can be used.

This makes them useful for adding:

• Booking calendars
• Custom pricing displays
• Comparison sections
• Interactive widgets
• Custom HTML layouts
• Video or media embeds
• External forms
• Calculators
• Special CTA sections
• Other embedded applications

This is often the better route when only one section needs to be custom.

There is little reason to modify an entire theme just to add one specialised component to a sales page.

4. Add Third-Party Tools and Tracking Code

Custom code is also useful when another platform gives you a snippet that needs to be installed on your Kajabi website.

Common examples include analytics, tracking and embedded applications.

Kajabi's site settings provide a Header Page Scripts area for site-wide code. Code placed there is loaded across website pages, although Kajabi notes that normal site-wide header scripts do not apply to Offer checkout pages and upsell pages.

Kajabi also supports native or custom tracking integrations, including tools such as Google Analytics and Meta Pixel, while other tracking scripts can be added through page scripts.

This can help when you need to connect Kajabi with:

• Analytics platforms
• Advertising pixels
• Heatmap tools
• Booking software
• Chat tools
• External forms
• Marketing widgets
• Other JavaScript-based services

What about tracking Kajabi checkout pages?

Checkout tracking is handled separately.

Kajabi currently provides dedicated Checkout Tracking Code settings for adding trusted JavaScript tracking code to checkout pages.

That distinction matters because code installed globally on the rest of your website should not automatically be assumed to run throughout the checkout experience.

5. Modify Kajabi Theme Code

For significantly deeper customisation, Kajabi provides a Code Editor for supported Website, Product and Landing Page templates.

Kajabi's theme system uses Liquid, along with theme assets such as CSS, JavaScript, layouts, sections, snippets and templates.

Theme-level development can therefore provide much more control over:

• Website layouts
• Reusable sections
• Product templates
• Navigation structures
• Dynamic Kajabi content
• Blog layouts
• Member-facing layouts
• Theme settings
• Custom reusable components

Kajabi's documentation currently states that Code Editor access is available with the Pro Plan. It also warns that theme code changes may not remain when a template is later updated.

For that reason, theme editing is different from dropping a few lines of CSS onto a landing page. It should be treated as development work that needs testing and maintenance.

What Cannot Be Fully Customised With Kajabi Custom Code?

This is the part that is easy to misunderstand.

Having access to HTML, CSS, JavaScript and Liquid does not mean every part of Kajabi becomes editable.

Kajabi's Core Platform

Custom front-end code does not give you unrestricted access to Kajabi's underlying platform.

Where Kajabi exposes data or functionality through its theme system, API, webhooks or native features, developers can build around it. That is different from directly rewriting Kajabi's internal application. Kajabi now provides a public API for supported integrations and workflows, with webhooks available for other integration use cases.

If a project requires functionality outside what Kajabi exposes, adding another JavaScript snippet to the website is unlikely to solve the problem.

Checkout Source Code

Kajabi's full Code Editor is not available for checkout pages.

That does not mean checkout cannot be customised.

Kajabi's current checkout editor allows changes to areas including page content, colours, typography, layouts, fields and certain purchase-flow settings. Separate checkout tracking-code settings are also available.

But that is different from having unrestricted access to the complete checkout template source.

Every Native Kajabi Feature

Custom code can change what visitors see and how certain front-end elements behave, but it cannot automatically rewrite the logic of every native Kajabi feature.

When the requirement involves products, contacts, purchases, workflows or external applications rather than page presentation, you may need to look at:

• Kajabi's native settings
• Automations
• Webhooks
• Public API
• Third-party integrations

rather than trying to solve everything through page-level custom code.

Where Can Custom Code Be Added in Kajabi?

The best location depends on how widely the change needs to apply.

For one page:
Use the page's Custom Code settings for page-specific CSS or JavaScript.

For one section:
Use a Custom Code block or Custom Code Section.

For the main website:
Use Header Page Scripts when a script needs to load across applicable site pages.

For deeper theme development:
Use the Kajabi Code Editor where your plan and template support it.

For checkout tracking:
Use Kajabi's separate Checkout Tracking Code settings.

Using the narrowest appropriate location usually makes custom code easier to maintain.

When Is Custom Code Worth Using in Kajabi?

Custom code makes sense when it solves a real limitation.

Good reasons include:

• Your brand design cannot be achieved cleanly with native settings
• You need a custom section that Kajabi does not provide
• A trusted third-party service needs to be embedded
• You need additional front-end interaction
• Your Kajabi theme requires deeper development
• A conversion-focused design needs more precise control

It makes less sense to add custom code merely because it is possible.

Every custom script becomes another thing that may need to be checked after theme or platform changes.

Kajabi itself warns that third-party or custom code can introduce security, compatibility and future-update issues, and custom coding falls outside the normal scope of Kajabi Support.

Should You Use Kajabi's Builder or Custom Code?

Start with Kajabi's native tools.

Then introduce code only where those tools cannot produce the result you need.

A sensible order is:

1. Use Kajabi's standard settings.
2. Adjust the section or page builder.
3. Add targeted CSS where required.
4. Add a Custom Code block for specialised elements.
5. Use JavaScript when genuine interaction is needed.
6. Modify theme files only when deeper control justifies the maintenance.

That approach keeps Kajabi manageable while still giving you room to create a site that does not feel restricted by its default templates.

Final Thoughts

Kajabi can be customised considerably, but custom code extends the platform rather than replacing its architecture.

CSS can refine the design. JavaScript can add front-end behaviour. Custom Code blocks can introduce new components and external tools. Theme development can go considerably deeper through Liquid and Kajabi's theme files.

The boundary appears when a requirement depends on changing Kajabi's underlying platform rather than the pages and interfaces Kajabi makes available for customisation.

Knowing that boundary before development starts can save a lot of time—and prevent a simple Kajabi customisation from turning into an unnecessarily fragile build.