Custom code is HTML, CSS or JavaScript added alongside what is built visually in Webflow. It is used when a function cannot be solved well enough with Webflow's standard features or when the website needs to connect to an external service.
What does custom code involve in practice?
In practice, custom code can be used for analytics tools, advanced forms, third-party libraries, dynamic functions or special integrations. The code should be documented, loaded in the right place and tested after publishing. Unnecessary or poorly optimised code can cause errors, security challenges and slower loading.
Custom code is relevant when the need is clear and the function adds value that cannot be solved more simply. It should be a controlled part of the solution, not a place for code that nobody owns anymore. See Webflow's documentation on custom code, Integrations and Core Web Vitals.
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