HTML to JSX Converter Online

What Changes from HTML to JSX

JSX looks like HTML but follows JavaScript rules, so several attributes and patterns need to change before your markup will compile in a React component. Understanding these differences saves time and prevents frustrating build errors.

• Attribute renames — HTML's class becomes className, for becomes htmlFor, and event handlers switch from lowercase (onclick) to camelCase (onClick). Data attributes like data-id and ARIA attributes like aria-label stay unchanged.
• Self-closing tags — void elements such as <br>, <img>, <input>, and <hr> must use the self-closing slash in JSX (<br />). HTML is lenient about this; JSX is not.
• Style objects — inline styles change from a CSS string (style="color: red") to a JavaScript object (style={{ color: 'red' }}). Property names use camelCase, so font-size becomes fontSize.
• Comments — HTML comments (<!-- ... -->) are replaced with JavaScript block comments wrapped in curly braces ({/* ... */}).

Common HTML-to-JSX Pitfalls

Even experienced React developers trip over these when converting HTML snippets by hand. Automated conversion eliminates these mistakes, but it helps to know what to watch for when reading the output.

• Forgetting className — leaving class in your JSX will not throw a build error, but React will emit a console warning and the attribute may not behave as expected in all environments. It is one of the most common mistakes when pasting HTML into a component.
• Style string vs. object — passing a CSS string to style will cause a runtime error in React. The value must be a JavaScript object with camelCased keys and string or number values. Numeric pixel values can omit the unit ({{ fontSize: 14 }} equals 14px).
• Boolean attributes — in HTML you write disabled or checked as standalone attributes. JSX treats them the same way, but if you write disabled="false" it will still be truthy because the string "false" is truthy in JavaScript. Use disabled={false} instead.
• Unclosed tags — HTML is forgiving with unclosed <li> or <p> elements. JSX requires every opening tag to have a corresponding closing tag, or the parser will throw a syntax error.

When You Need an HTML to JSX Converter

Converting HTML to JSX by hand is tedious and error-prone, especially with large blocks of markup. An automated converter handles the mechanical transformations so you can focus on the logic and state management that actually matter in your React component.

• Migrating server-rendered templates — when moving from a traditional stack (PHP, Rails ERB, Django templates, or plain HTML) to React, you often have hundreds of lines of production HTML that need to become JSX. Doing it manually risks introducing subtle bugs.
• Stack Overflow and documentation snippets — code examples on the web are almost always plain HTML. Pasting them directly into a React component will fail. A quick conversion step lets you try solutions without hand-editing every attribute.
• Email templates to React Email — if you are migrating HTML email templates to a React-based email framework like React Email or MJML-React, the markup needs JSX syntax. The converter handles the attribute and style transformations in bulk.
• Design tool exports — tools like Figma or Webflow export clean HTML, but it still needs conversion before you can drop it into a React project. Running it through a converter is faster than fixing each attribute by hand.

All processing happens entirely in your browser. Your markup is never sent to a server, so you can safely convert internal or proprietary HTML without any privacy concerns.

Related Tools

If you are working with HTML and React, these tools may also be useful. The HTML Beautifier reformats messy markup with proper indentation before you convert it, making the resulting JSX easier to read. The HTML Viewer lets you preview rendered output side by side with the source. And if you are converting JSON API responses into TypeScript interfaces for your components, the JSON to TypeScript converter generates type definitions from sample data.