HTML Online Editor & Compiler

Write, run & share HTML code online using OneCompiler's HTML Code Editor for free. It's robust and feature-rich, running the latest version of HTML5.

The editor shows sample boilerplate code and supports styles in <style> tags and scripts in <script> tags within the HTML.

About HTML

HTML (Hyper Text Markup Language) is the standard markup language for web pages, created by Tim Berners-Lee in 1991. Almost every website uses HTML.

Syntax Help

Start with <!DOCTYPE html>
HTML begins with <html> and ends with </html>
Use <h1> to <h6> for headings
Wrap text in <p> for paragraphs
Links: <a href="...">
Images: <img src="..." />
Lists: <ul> or <ol> with <li>

Example

<a href="https://compiler.zeroday.fun">HTML Online Compiler</a>

CSS Styling

CSS defines how HTML appears. You can control layout, color, fonts, and responsiveness by including <style> tags within your HTML or linking to external stylesheets (though this editor focuses on inline CSS for simplicity).

<style>
  body {
    padding: 25px;
    font-family: sans-serif;
    background-color: #f4f4f4;
  }
  .title {
    color: #228B22;
    font-family: Candara;
  }
</style>
<h1 class="title">Green Title</h1>
<p>This is a paragraph with some styling.</p>

Tables

<table> - Table container
<tr> - Table row
<th> - Table header
<td> - Table data
<caption> - Table title

Using JavaScript

Use JavaScript for interactivity in HTML by including <script> tags within your HTML or linking to external scripts (though this editor focuses on inline JS for simplicity).

<button onclick="alert('Hello!')">Click Me</button>
<script>
  function greet() {
    alert('Hello from JavaScript!');
  }
</script>

Hosting on Custom Domain

You can host your compiler project at compiler.zeroday.fun using GitHub Pages, Vercel, or Netlify by uploading this content.

CODESTACKS

HTML, CSS & JS Compiler

HTML

CSS

JavaScript

Output