Clean up and indent HTML markup. Format minified or messy HTML into readable code.
This free online HTML beautifier uses the js-beautify library to reformat minified, compressed, or poorly indented HTML markup into clean, consistently indented code that is easy to read and edit. It is a must-have for front-end developers who receive minified HTML from build tools, CMSs, or web scrapers and need to inspect or modify the structure. All processing happens client-side - your markup never leaves your browser.
The HTML Beautifier uses the js-beautify library - the same engine behind the Beautify extension in VS Code - to parse and reformat HTML markup. It applies 2-space indentation, wraps long lines at 120 characters, and normalizes attribute spacing while preserving inline elements such as <span> and <a>. Because js-beautify runs entirely in your browser, formatting is instant and your markup never leaves your machine.
In almost all cases, no. HTML browsers treat runs of whitespace between block-level elements as insignificant, so adding indentation and line breaks has no visual effect. The one exception is whitespace between inline elements like <span> or <img> inside text flow, where extra spaces can create a small gap - js-beautify is aware of this and preserves inline element context to avoid introducing visible whitespace artifacts.
There is no enforced limit - the tool processes whatever you paste directly in your browser's memory. Full HTML pages exported from CMSs, page builders, or browser "Save as HTML" can typically be formatted without issue. Very large files (over 5 MB) may take a second or two on low-end devices, but no data is ever uploaded, so there are no server-side restrictions.
Yes - copy the minified source from your browser's "View Page Source" or the Network tab in DevTools, paste it into the input panel, and click Beautify HTML to get a readable, indented version. This is useful for inspecting competitor markup, auditing CMS output, or understanding the structure of a page that doesn't have accessible source files. Keep in mind that the resulting code reflects what the server sent, not the original pre-build source.
The HTML Beautifier adds whitespace and indentation to make code human-readable - ideal for development, debugging, and documentation. The HTML Minifier does the opposite: it removes whitespace and comments to reduce file size for production deployment. Use the Beautifier when you need to read or edit HTML, and the Minifier when you are preparing it for delivery to end users where every byte of load time matters.