Free Code Beautifier Online

Inherited a 600-line one-liner of bundled JavaScript? Pasted CSS that arrived as a single unbroken paragraph? Looking at minified HTML and trying to find a div somewhere inside it? Our free online Code Beautifier turns that compact, machine-friendly soup back into properly indented, line-broken, human-readable code in one click. Drop your code into the editor, pick the language, and the formatter applies the conventional indentation and line-break rules for that language: HTML gets nested elements indented with closing tags aligned, CSS gets one rule per line with selectors separated, JavaScript gets statement-per-line layout with proper brace placement, JSON gets standard 2-space indentation with one key per line, and SQL gets keyword-aligned formatting that makes long queries actually readable. The beautifier handles each language with rules tailored to it rather than a one-size-fits-all reformatter, which matters because what looks "right" in CSS does not look right in JavaScript and vice versa. You can pick your indentation style (2 spaces, 4 spaces, or tab), and for JavaScript you can choose between K&R brace style and Allman style if you have a project preference. Real-world scenarios where this saves time: debugging a production bug by copying minified bundle output from the browser DevTools and beautifying it locally to set breakpoints; reviewing a pull request where someone committed unformatted code; reading a third-party library that ships only the minified build; making sense of someone's pasted JSON response from an API; cleaning up an HTML email template that came out of a CMS as one massive line; or simply standardising a small snippet before pasting it into documentation. Compared to running Prettier or a language-specific formatter locally, the trade-off is convenience versus customisation: a local toolchain gives you total control over rule sets and integrates with your editor, but takes setup time and a Node.js install. This page is one bookmark away in any browser and produces output that matches the most common conventions for each language out of the box. If you need more focused tools, the [HTML Beautifier](/tools/html-beautifier), [CSS Minifier](/tools/css-minifier), [JSON Formatter](/tools/json-formatter), and [XML Formatter](/tools/xml-formatter) each handle their respective formats with deeper, format-specific options. For the opposite operation — squeezing code back down to its smallest possible size for production deployment — the [CSS/JS Minifier](/tools/css-js-minifier) compresses both languages in one place. Everything happens locally in your browser, so even proprietary code is safe to paste here without it leaving your device.