Custom Code

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Custom Code

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Definition

Custom Code in Webflow refers to the possibility of adding custom HTML, CSS, or JavaScript code to a Webflow project, beyond the native functionalities of the platform. This makes it possible to extend the capabilities of Webflow, to integrate third-party services, to customize behaviors, or to implement specific functionalities that are not available in the visual interface.

Why use custom code in Webflow

Even though Webflow is a very complete No-Code tool, some advanced features require customization that goes beyond the options offered by default. Custom Code allows you to:

  • Add complex JavaScript effects or interactions
  • Insert external libraries like GSAP, Swiper, Plyr, or Splide
  • Customize technical SEO (dynamic meta tags, hreflang, etc.)
  • Connect Webflow to third-party tools via scripts (analytics, CRM, tracking)
  • Create custom dynamic or interactive elements
  • Override the CSS style to refine responsiveness or accessibility

Where to inject custom code in Webflow

Webflow allows you to add custom code at several levels:

  • In the pages: via the “Custom Code” panel in the settings of each page. Great for scripts or tags that are specific to a single page.
  • At the global level of the site: in the project settings, “Custom Code” tab, to insert code in <head>or before the tag is closed <body>on all pages of the site.
  • In Embed elements: directly on the page, via the HTML Embed component, to insert code into the layout (iframe, script, SVG tag, etc.)

Best practices for use

  • Always comment out the code to make it easier to maintain
  • Test the rendering on different browsers and screen sizes
  • Minimize dependencies: favor lightweight code and avoid heavy libraries if not necessary
  • Do not overload the DOM: an excess of JavaScript or injected elements can slow down the site
  • Use existing Webflow classes when possible to avoid CSS conflicts
  • Check mobile compatibility and SEO for each script addition

Limitations and precautions

  • Webflow does not allow you to execute backend code (PHP, Node, etc.): only client code is supported
  • Custom Code is disabled in preview mode (Designer): you have to publish the site to see the final rendering
  • A poorly written script can break the display or affect the overall performance of the site.
  • Some integrations (like Memberstack, Firebase, Stripe...) require rigorous configuration to work properly in Webflow

Common use cases

  • Integration of custom animations with GSAP or Lenis
  • Marketing tracking scripts: Facebook Pixel, Google Analytics, Hotjar...
  • Customizing a non-native slider or carousel
  • Creating a progress bar in JavaScript
  • Setting up conditional behavior (e.g. displaying a block if the user is connected)

In summary

Custom Code is a powerful tool in Webflow to get out of the framework imposed by the visual interface and create tailor-made web experiences. Well used, it makes it possible to combine the best of No-Code and classical development, while maintaining great flexibility. It is an essential tool for advanced users who want to go further in customizing their Webflow projects.

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