C++ Beautifier

Paste compact C++ source and expand it into readable, consistently indented code.

Last updated: May 29, 2026

Indent:Preserve blank linesFinal newline

Messy or Minified C++ Code

4 lines, 182 B

Beautified C++ Code

#include <iostream>
#include <vector>
using namespace std;

int main() {
  vector<int> nums={
    3,1,2
  };
  int total=0;
  for(int i=0;i<nums.size();i++) {
    total+=nums[i];
  }
  cout<<total<<endl;
  return 0;
}

15 lines, 217 B

Input: 4 linesOutput: 15 linesSize: 217 B

Client-Side Processing

Input Data Stays on Device

Instant Local Execution

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What is C++ Beautifier?

C++ Beautifier formats C++ snippets so classes, functions, loops, and conditionals are easier to inspect. It is built for quick browser-side cleanup of copied source, small examples, and compact code blocks. The formatter is intentionally lightweight and focuses on indentation and line breaks rather than compiling or rewriting the program, so it never changes what your code does.

How to Use C++ Beautifier

Paste C++ source code.

Choose indentation style.

Click Format.

Review the beautified C++ output.

Copy or download the .cpp file.

Common Use Cases

Cleaning C++ examples before adding them to a tutorial or README.
Reading compact code copied from a forum answer or issue comment.
Making short C++ snippets easier to review in a pull request.
Preparing code samples for screenshots or slides.

Example Input and Output

A compact C++ function is expanded into readable lines.

Compact C++

int square(int n){int result=n*n;return result;}

Beautified C++

int square(int n) {
  int result=n*n;
  return result;
}

Privacy

C++ code is beautified locally in the browser and is not uploaded.

Frequently Asked Questions

Does this compile or validate C++?

No. It formats text for readability only. Use a C++ compiler such as g++ or clang to validate syntax.

Will it change my program behavior?

No. It only adjusts whitespace and line breaks, never the code itself.

Does it handle for loops and templates?

Yes. Semicolons inside for loop parentheses are preserved on the same line, and template arguments are left untouched.

Is my source code uploaded anywhere?

No. Beautification runs entirely in your browser.

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