Use the free HTML to JSX Converter below: your data never leaves your browser — all work happens on your device, and nothing is uploaded to any server.
Why HTML and JSX Are Not the Same
HTML and JSX look almost identical, which is exactly why converting between them trips people up. JSX is the syntax React uses to describe user interfaces, and it borrows HTML’s tag shapes while changing a handful of rules. The most famous difference is that the class attribute becomes className, because class is a reserved word in JavaScript. The for attribute on labels becomes htmlFor for the same reason. If you paste raw HTML into a React component, the page will either refuse to compile or silently ignore attributes, and the error messages rarely point at the real cause.
The differences go beyond two renamed attributes. In HTML you can leave many tags unclosed, like br, img, and input, but JSX requires every element to close, either with a matching end tag or a self-closing slash. Inline styles change form completely: HTML uses a string like “color: red; font-size: 16px”, while JSX wants an object like { color: ‘red’, fontSize: ’16px’ }, with hyphenated property names converted to camelCase. HTML comments disappear in JSX unless they are wrapped as {/* comment */}, and any curly braces in text must be escaped or React will try to read them as JavaScript expressions.
How to Use the Tool
Paste your HTML into the input box and press Convert to JSX. The tool walks through your markup tag by tag, renames attributes to their JSX forms, converts style strings into style objects, closes void elements, and turns comments into JSX comments. If you tick the component option, the result is wrapped in a small function component with an export statement, so you can drop it straight into a file. The Copy button puts the result on your clipboard.
Start with a small piece of markup rather than a whole page. Convert one card, one form, or one section at a time, and check each result in your editor. That habit catches the few cases any converter cannot decide for you, such as event handlers that reference functions from your old page. The tool wraps inline event code as an arrow function so the output stays valid, but you should replace it with a real handler from your component.
The Attribute Map You Need to Know
Beyond className and htmlFor, the common renames include tabindex to tabIndex, readonly to readOnly, maxlength to maxLength, colspan to colSpan, rowspan to rowSpan, and datetime to dateTime. Attributes with dashes mostly become camelCase: accept-charset becomes acceptCharset, hreflang becomes hrefLang, and http-equiv becomes httpEquiv. Two families stay exactly as they are: data attributes like data-id, and aria attributes like aria-label, because React passes those through unchanged.
Boolean attributes deserve a note. In HTML, writing disabled with no value means true, and leaving it out means false. JSX works the same way, so the converter keeps bare boolean attributes as they are. For attributes that take a value, JSX keeps the same quoted string form as HTML, which is why most of your markup survives conversion untouched. The tool only changes what React actually requires.
Styles, Comments, and Text
Inline styles are the part of conversion most people get wrong by hand. A style string must be split on semicolons, each property name must be camelCased, and each value must become a string inside an object. Pixel values stay as strings or can become numbers, but the converter keeps them as strings to avoid changing your meaning. Vendor prefixes like -webkit-transform become WebkitTransform, following React’s rule that vendor prefixes are capitalized except for ms, which stays lowercase.
Text content mostly passes through, with one exception: curly braces. In JSX, { starts a JavaScript expression, so a literal brace in your text, such as a math example or a template snippet, must be written as {‘{‘} and {‘}’}. The converter handles that for you. HTML entities like & are left alone, because JSX understands the same entities HTML does.
Mistakes to Avoid
Do not convert an entire page at once and assume it works. Large pages usually contain script tags, inline event handlers, and attributes from frameworks that have no JSX equivalent, and those need human decisions. Do not forget that JSX elements must have a single root when returned from a component, so wrap siblings in a div or a fragment. And do not keep the placeholder handler code the converter generates for events: it exists to keep the output valid, not to preserve behavior.
When This Converter Helps Most
The tool shines when you are lifting a design from a static mockup, a template, or an old site into a React project. Designers often hand over HTML, and developers waste the first hour renaming attributes by hand. A converter removes that mechanical step and leaves the interesting decisions, like state and props, to you. It is also handy for learning: paste a snippet, study what changed, and the JSX rules stick far faster than reading a list of them.
One honest limit: the converter maps syntax, not behavior. It cannot know that your onclick code called a global function, or that your form posted to a server endpoint your component should now handle with fetch. Treat the output as a faithful translation of structure, review the handful of lines it flags by wrapping handlers, and you will have a solid starting point for any React component.