Free Online Code Beautifier
Format JavaScript, CSS, and HTML code in one click, automatically cleaning up indentation and line breaks. Multiple styles, fully local.
Key Features
Multi-language
Beautify JavaScript, CSS, and HTML in one click.
Adjustable Style
Choose indent width and quote style to match your team's conventions.
Local Processing
Code is formatted only in the browser and is never uploaded.
One-click Copy
Copy the beautified result in one click and paste it back into your editor.
How to Use
Choose Language
Select the code type: JavaScript, CSS, or HTML.
Paste Code
Paste the code you want to beautify into the input box.
Format & Copy
Click Format and copy the beautified code.
Frequently Asked Questions
Which languages are supported?
JavaScript, CSS, and HTML β the three most common frontend languages, covering most formatting needs.
Will my code be uploaded to a server?
No. All formatting happens locally in the browser, and your code never leaves the device.
Can I set the indent width?
Yes. The default is 2-space indentation, and you can adjust it to match your team's conventions.
Does formatting change the code logic?
No. Formatting only adjusts whitespace, indentation, and line breaks; it does not change code semantics or execution results.