HTML / CSS April 21, 2026 · 5 min read

HTML Code Humanizer — Clean Up AI-Generated HTML and CSS (Guide)

AI-generated markup tends to be over-commented and over-wrapped, with class names that ignore your design system. Here is how to clean it up so it fits your project.

Heads up: the Code Humanizer tool currently supports Python, JavaScript, Java and C/C++. HTML and CSS support is on the roadmap — until then, this guide shows how to do the clean-up by hand.

What gives AI-generated HTML away

A comment above every element —  above a <header>
Wrapper divs that exist only to hold one child
Generic class names like main-container and button-wrapper instead of your design system's classes
Divs where semantic elements belong — <div class="nav"> instead of <nav>

Before and after

AI draft

<div class="main-container">  <header class="header-section"> <h1 class="header-title">Welcome</h1> </header>  <div class="button-wrapper"> <button class="primary-button" type="button">Get started</button> </div> </div>

Cleaned up by hand

<main class="page"> <header> <h1>Welcome</h1> </header> <button class="btn btn-primary" type="button">Get started</button> </main>

An HTML and CSS clean-up checklist

Remove comments that name the element below them
Replace generic divs with semantic elements (main, nav, section, button)
Swap invented class names for your existing utility or component classes
Delete wrappers that have no styles or behaviour attached
Run Prettier so formatting matches the rest of the project

Need the same clean-up for JavaScript?

Code Humanizer automates it for JavaScript, Python, Java and C/C++. 3 free tries, no account needed.

Try Code Humanizer free