Code Formatter Online

A web-based formatter that standardizes code styling across languages, helping developers and students produce clean, readable, and consistent source code.

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3,344+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

Worked Example & Common Values

Below is a sample worked calculation demonstrating how Code Formatter Online processes input data instantly inside your browser.

Sample Input Minified string: {"id":1,"status":"active","roles":["admin"]}

Computed Result

{
  "id": 1,
  "status": "active",
  "roles": [
    "admin"
  ]
}

Execution Mode Client-Side In-Browser JS

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About This Tool

This tool formats code by language-aware rules to improve readability and enforce team conventions.
It conceptually parses the source when possible to an abstract representation and then re-serializes with normalized indentation, wrap width, and quote styles. When a parser is unavailable, it applies safe, heuristic reformatting while preserving semantics.
Who benefits includes developers preparing PRs, students learning syntax, and teams enforcing style guides. Unique value lies in language coverage, consistent results, preservation of comments and literals, and options for per-language defaults. Core features include language-aware formatting, indentation normalization, line wrapping, and option sets for indent size, tabs vs spaces, and quote style, with support for exporting or copying the formatted code.
Use cases span pre-commit checks, code reviews, and educational exercises to illustrate proper styling without changing code behavior.

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How to Use

Provide inputs: paste or upload code and select language.
Set formatting options: indentation, line width, quote style.
Run formatter: trigger formatting operation or enable auto-format.
Review outputs: inspect formatted code and optional diff notes.
Copy or export: copy to clipboard or download formatted file.

Frequently Asked Questions

Find Quick Answers

Which languages are supported?

Supports major languages (Python, JavaScript, Java, C#, Go, Ruby, and more). The formatter uses language grammars where available and is designed to be extended with additional languages via plug-ins to broaden coverage.

Are comments preserved?

Yes, comments are preserved and formatted according to per-language conventions to maintain intent, readability, and alignment with surrounding code structure.

Does formatting affect code behavior?

No. The formatter changes whitespace, indentation, and symbols only, leaving semantic behavior unchanged and ensuring consistent presentation.

Can I customize style defaults?

Yes. Indent size, tab vs spaces, line length, and quote style can be configured per language or globally, with optional saved profiles.

Need to run multiple calculations?

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