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HTML / CSS / JavaScript Formatter

Format supported source code with a real parser and keep the original beside the result.

Format supported source code with a real parser and keep the original beside the result.

Options

Up to 500,000 bytes of UTF-8, 100 structural levels and a 5-second Worker budget. Use pinned lazy-loaded Prettier standalone parsers. Reject invalid syntax; do not execute HTML/JS or load imports. Formatting can change whitespace and quoting. No minification, linting, transpilation or runtime behavior guarantee.

How to use

HTML / CSS / JavaScript Formatter

Format supported source code with a real parser and keep the original beside the result.

Step by step

  1. Choose a supported input or load the example, then review the original.
  2. Format supported source code with a real parser and keep the original beside the result. Start with the displayed settings, change only the options needed for your output and compare the result with your source.
  3. Run the task, review the actual result and copy or download a checked copy.

Choosing the settings

OptionWhat changes
OptionsFormat supported source code with a real parser and keep the original beside the result. Start with the displayed settings, change only the options needed for your output and compare the result with your source.
LimitsUp to 500,000 bytes of UTF-8, 100 structural levels and a 5-second Worker budget. Use pinned lazy-loaded Prettier standalone parsers. Reject invalid syntax; do not execute HTML/JS or load imports. Formatting can change whitespace and quoting. No minification, linting, transpilation or runtime behavior guarantee.

Example and expected result

const x={a:1}; formats to const x = { a: 1 }; in JavaScript mode. An incomplete expression gives a parser location instead of a partial download.

If it is not working

  • Syntax error at the shown line/column. Fix it or choose the correct language; the original is kept.

Formats and limits

Up to 500,000 bytes of UTF-8, 100 structural levels and a 5-second Worker budget. Use pinned lazy-loaded Prettier standalone parsers. Reject invalid syntax; do not execute HTML/JS or load imports. Formatting can change whitespace and quoting. No minification, linting, transpilation or runtime behavior guarantee.

FAQ

What does this tool do?

Format supported source code with a real parser and keep the original beside the result.

Which setting should I choose?

Format supported source code with a real parser and keep the original beside the result. Start with the displayed settings, change only the options needed for your output and compare the result with your source.

What are the limits?

Up to 500,000 bytes of UTF-8, 100 structural levels and a 5-second Worker budget. Use pinned lazy-loaded Prettier standalone parsers. Reject invalid syntax; do not execute HTML/JS or load imports. Formatting can change whitespace and quoting. No minification, linting, transpilation or runtime behavior guarantee.

Why did processing fail?

Syntax error at the shown line/column. Fix it or choose the correct language; the original is kept.

Is my input uploaded or saved?

No. Processing runs on your device. Inputs and results stay in this page’s memory until you clear it or leave. They are not uploaded, logged or stored by ToolRobin. Copying places the result on your device’s clipboard.

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