Free Code Beautifier – Format CSS JS HTML Online

What a Code Beautifier Does and How It Works

Beautifying is minifying in reverse. It takes CSS, JavaScript or HTML that has been squashed onto one line, or written carelessly, and rebuilds it with real indentation, one statement per line and consistent spacing so you can read the structure. The people who need it most are not always the people who wrote the code: a developer inspecting a vendor bundle to work out why it throws, a support engineer reading a theme file a previous freelancer left behind, a student trying to follow a snippet copied out of a chat window that lost every line break. The behaviour of the code never changes. Only its shape does, and shape is what makes nested logic possible to follow. Each language gets its own rules. In CSS every selector opens a block, each declaration moves to its own line and gets one indent level deeper, and closing braces return to the parent level. In JavaScript the beautifier tracks brace and bracket depth to indent function bodies, conditionals and loops, and puts each statement on its own line while leaving string and template literal contents alone. In HTML child elements are nested one level under their parent so the document tree becomes visible, with void elements kept on a single line. You choose the indent unit: two spaces, four spaces or a tab. Since whitespace is insignificant to all three parsers, the output is guaranteed to run exactly as the input did. Try a minified rule. The input is a single line reading .card{margin:0 auto;padding:16px 24px}.card h2{font-size:20px} with no spaces at all. Beautified with two-space indentation it becomes six lines: the .card selector with an opening brace, then margin and padding each on an indented line with a space after the colon and a trailing semicolon, then a closing brace, a blank separator, and the .card h2 block laid out the same way. Nothing was added or removed semantically, but now you can scan the declarations vertically, spot that padding uses two values, and put your cursor on the exact line you want to change without counting semicolons. Switch the indent to four spaces and the same rule re-lays out again with no risk to the CSS itself. Where it earns its keep in practice. A developer debugging a production error in a minified vendor script beautifies it locally so the stack trace line number actually points at readable code. An agency taking over a WordPress site formats the previous developer functions file, saved as one enormous line, before reviewing it. A QA engineer reads the compressed inline script in a checkout page to confirm which analytics event fires on submit. Someone building a code example for documentation pastes a squashed snippet in, gets a clean version out, and screenshots that instead of the wall of text. In each case the alternative is manually inserting hundreds of line breaks, which nobody has time for. Set expectations correctly on one point, because this disappoints people regularly: beautifying cannot undo what minification destroyed. If a bundler renamed your descriptive variables to a, b and c and deleted every comment, that information is gone for good, and no formatter can invent it. You get clear structure with cryptic names, which is still a large improvement but not the original source. If a source map exists, use that instead for genuine recovery of names. For code you write yourself, wire Prettier into your editor so formatting happens on save and this step becomes unnecessary. One more practical note: beautify, edit, then minify again before shipping, so production still gets the small file. All formatting runs in your browser, so proprietary code is never uploaded anywhere.

Learn More — Beautify CSS / JS / HTML Guide

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