Beautify minified JavaScript, CSS, HTML, and JSON with a live preview.
Reformat minified or messy JavaScript, CSS, HTML, and JSON into clean, readable code with consistent indentation — using the same engine as beautifier.io (js-beautify). JSON is validated as it’s formatted. Runs entirely in your browser.
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No. Minifiers rename variables to single letters and that mapping is discarded, so beautifying restores structure and indentation but not meaning — you will still see a, b and c rather than the original names. Only a source map can recover the real names, which is why shipping one matters for debugging production.
No. Only whitespace and line breaks change. The one thing worth knowing is that JavaScript relies on automatic semicolon insertion, so badly written code without semicolons can theoretically shift meaning when reformatted — a good argument for semicolons or a linter rather than against formatting.
No, formatting runs entirely in your browser. That is deliberate: pasting proprietary source, internal configuration or anything containing keys into a tool that uploads it is a real risk. Here nothing is transmitted or stored, so you can safely format code you would not paste elsewhere.
Yes, Code Beautifier is completely free. No signup, no account, and no watermark on outputs. A Pro tier is available for 100 AI ops/day and larger file sizes.
Code Beautifier runs entirely in your browser. Your file is never uploaded — it is read, processed and saved locally, so it never reaches our servers or anyone else's. You can disconnect from the internet after the page loads and it still works.
What it does: Reformats minified or badly-indented JavaScript, CSS, HTML, and JSON into clean, readable code with consistent indentation — using the same engine as beautifier.io (js-beautify).
Uses: Making a minified library readable, cleaning up copy-pasted snippets, or standardising formatting before committing. JSON is also validated as it’s formatted.
Privacy: Everything runs in your browser — your code is never uploaded, so it’s safe for proprietary source.