Does this use the real Prettier, or a simplified clone?

It imports the actual prettier/standalone package with the matching plugin for each language, so output matches running Prettier locally with default options.

Is my code uploaded anywhere when I format it?

No. Prettier and its plugins run inside your browser tab, so the source you paste and the formatted result never travel over the network.

Why does formatting fail on my JSON or JavaScript?

Prettier needs to parse the input into a syntax tree before it can print it, so a missing bracket, stray comma, or invalid token stops formatting and shows a parse error instead of silently fixing it.

Which languages does the formatter support?

JavaScript, TypeScript, JSON, CSS, SCSS, LESS, HTML, Markdown and YAML, each formatted with Prettier's own parser and plugin for that language.

Can I customize indentation or quote style?

No, this tool formats with Prettier's default options for each language; there's no settings panel for tab width, quote style, or line length.

Code Formatter

Format JavaScript, TypeScript, CSS, SCSS, HTML, JSON, YAML and Markdown with Prettier, locally.

Local, Runs entirely in your browser, your data never leaves your device.

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Prettier formatting for nine languages, no server round trip

This tool runs Prettier standalone in the browser to reformat JavaScript, TypeScript, JSON, CSS, SCSS, LESS, HTML, Markdown and YAML into a consistent, opinionated style. It's useful when you've got a minified snippet, a copy-pasted config, or code from a chat log and want it readable before committing or reviewing it. Each language's Prettier plugin loads on demand, and your source never leaves the tab.

How to use the Code Formatter

Pick a language from the dropdown: JavaScript, TypeScript, JSON, CSS, SCSS, LESS, HTML, Markdown or YAML.
Paste or type the source into the left editor panel.
Read the formatted result in the right panel as it updates automatically.
Check the error message under the input if Prettier can't parse the code.
Copy the formatted output, or send it to another tool with the send-to menu.

Each language uses Prettier's actual parser (babel for JavaScript, the typescript parser for TypeScript, postcss for CSS/SCSS/LESS, and dedicated parsers for HTML, Markdown and YAML), so formatting matches what Prettier would produce from the command line, not an approximation.

Formatting requires valid syntax. A trailing comma error or unclosed brace will surface as a parse error rather than a best-effort reformat, which is Prettier's normal behavior.

Frequently asked questions

Does this use the real Prettier, or a simplified clone?: It imports the actual prettier/standalone package with the matching plugin for each language, so output matches running Prettier locally with default options.
Is my code uploaded anywhere when I format it?: No. Prettier and its plugins run inside your browser tab, so the source you paste and the formatted result never travel over the network.
Why does formatting fail on my JSON or JavaScript?: Prettier needs to parse the input into a syntax tree before it can print it, so a missing bracket, stray comma, or invalid token stops formatting and shows a parse error instead of silently fixing it.
Which languages does the formatter support?: JavaScript, TypeScript, JSON, CSS, SCSS, LESS, HTML, Markdown and YAML, each formatted with Prettier's own parser and plugin for that language.
Can I customize indentation or quote style?: No, this tool formats with Prettier's default options for each language; there's no settings panel for tab width, quote style, or line length.