Code Formatter

Paste or upload code, choose the language, adjust formatting options, and compare the formatted output before copying it back into your editor.

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

Use fallback indentation for other languages, then verify with your normal project tools.

  • Format source code directly in your browser
  • Upload a file and detect the language from its extension
  • Copy or download the formatted code after review

How to use Code Formatter

Choose the language first, format the code, then inspect the output before committing it or sending it to a teammate.

  1. 1

    Paste or upload source code

    Paste code into the input editor or upload a supported source file. Uploaded files are read in the browser and the language selector updates when the file extension matches a supported option.

  2. 2

    Choose language and options

    Select the correct language, then open options for Prettier-supported formats to adjust print width, tab width, tabs, semicolons, quotes, bracket spacing, trailing commas, and arrow parentheses.

  3. 3

    Format, compare, and export

    Run the formatter, compare input with the syntax-highlighted output, then copy or download the formatted code. If the formatter reports a syntax issue, fix the source before treating the output as final.

Prettier-backed formatting

JavaScript, TypeScript, HTML, CSS, JSON, Markdown, and YAML use Prettier in the browser for consistent formatting rules before review.

Side-by-side code review

The input editor and formatted output sit next to each other on wide screens, making it easier to catch accidental changes before copying.

File upload and language detection

Upload a supported file type and the formatter can select the matching language based on the extension, such as .js, .tsx, .json, .css, .md, or .yaml.

Formatting options

Adjust print width, indentation, tabs, semicolons, quotes, trailing commas, bracket spacing, and arrow parentheses for parser-backed languages before export.

Browser-only workflow

Formatting happens in the open browser session during normal use, so quick code cleanup does not require an account or a project setup.

Copy and download output

Copy the original or formatted code to the clipboard, or download the formatted result with an extension that matches the selected language.

Code Formatter privacy and processing

Code Formatter explains how pasted source code, uploaded files, selected language, and formatted output are handled before you copy or download the result.

Processing Browser

Code Formatter runs formatting in the browser, using Prettier for supported languages and a simpler indentation pass for fallback language choices.

Storage None

Normal Code Formatter use does not create a stored server copy of pasted code, uploaded files, selected language, or formatted output.

Code Formatter account access

Code Formatter can be used without sign-in, so quick formatting checks can finish without creating a saved profile.

Before You Use Code Formatter

Review these notes before pasting source code, uploading a file, or replacing code in a real project.

Privacy

Source code can contain API keys, credentials, private endpoints, customer data, and unreleased business logic. Remove anything sensitive before using any online formatter.

Normal Code Formatter use runs in the browser and does not require sign-in, but company or client policy should still decide whether code may be pasted into a web tool.

Accuracy

Formatting changes layout, not intent. Review the output and run your normal tests, type checks, linter, or compiler before committing formatted code.

If Prettier reports a syntax error, fix the source instead of copying the returned fallback output as if it were safely formatted.

Compatibility

Prettier options apply to supported parser languages. Fallback languages use a simpler indentation pass and should not be treated as full language-specific formatters.

Select the language intentionally. A JSON snippet formatted as JavaScript, or a TSX file formatted as plain TypeScript, can produce confusing results.

Output

Compare the formatted output with your original source before replacing files. Pay attention to quotes, trailing commas, semicolons, and line wrapping if your team has a style guide.

Use copy for quick snippets and download for file handoff, then validate the result in the editor, build step, or repository where the code belongs.

Limits

Code Formatter works in the active browser workspace; very large source files may slow parsing, syntax highlighting, formatting, copying, or download.

Code Formatter is not a compiler, minifier, transpiler, security scanner, or full language server. It prepares readable formatting and leaves correctness checks to your project tooling.

Very large files can slow browser formatting or syntax highlighting, especially when Prettier needs to parse the full file before output appears.

Questions about Code Formatter

Which languages use Prettier formatting?

JavaScript, TypeScript, HTML, CSS, JSON, Markdown, and YAML use Prettier-backed formatting in this tool, with options for print width, tabs, quotes, semicolons, trailing commas, and more.

What happens with Python, Java, PHP, SQL, Bash, and other fallback languages?

Those languages use a basic indentation cleanup and syntax highlighting rather than a full language-specific formatter. Use your normal project formatter for final production changes.

Can I upload a code file?

Yes. The upload control reads supported files in the browser and can select the language from common extensions such as .js, .ts, .tsx, .html, .css, .json, .md, .yaml, .py, .java, .php, .sql, and .sh.

Does Code Formatter validate my code?

It can surface parser errors for Prettier-supported formats, but it is not a replacement for a compiler, linter, test suite, type checker, or security review.

Is my source code uploaded to a server?

Normal formatting runs in the browser and does not require an account. Still remove secrets and follow your team policy before pasting proprietary code into any browser-based tool.

4.4 (564 ratings)