Instantly format and beautify C language code. Choose from K&R, Allman, or GNU style. Real-time error detection, pointer spacing, and preprocessor support — all browser-based.
Professional-grade tools to write clean, consistent, and standards-compliant C programs.
Format your C code in K&R (Kernighan & Ritchie), Allman/BSD, or GNU style. Switch between coding standards with a single click to match your project requirements.
Instantly detects unmatched braces, missing semicolons, unsafe functions (gets, scanf without width), memory leak patterns, and preprocessor directive issues.
Control pointer declaration style: type-side (int*), variable-side (int *ptr), or middle (int * ptr) — consistent across your entire codebase.
Correctly handles #include, #define, #ifdef, #ifndef, #endif, and macro definitions without breaking formatting or indentation logic.
Export your formatted C code as a ready-to-compile .c file with one click. Drop it straight into your IDE, GCC pipeline, or version control system.
Your C source code is never sent to any server. All formatting and validation runs locally in your browser — perfect for proprietary or sensitive codebases.
Paste your C program into the left input editor. Click "Sample" to try the formatter with a real C program example including structs, pointers, and functions.
Pick your desired code style (K&R, Allman, GNU), indentation width, and pointer alignment preference from the formatting toolbar above.
Click "Format / Beautify" to get your clean, properly indented C code. Copy to clipboard or download as a .c file instantly.
A C code formatter is a specialized tool that automatically restructures C language source code to meet consistent style standards. Whether following the iconic K&R (Kernighan & Ritchie) style used in the original C book, the Allman style preferred in BSD environments, or the GNU coding standard, a C code beautifier eliminates manual indentation work and inconsistent spacing. This free online C language formatter handles complex scenarios like nested structs, pointer declarations, function prototypes, and preprocessor directives — all correctly formatted. Best practice in C development is to enforce consistent formatting through automated tools before every commit, preventing the most common code review friction. Our browser-based tool lets you format C code online without installing clang-format, indent, or any local tool. Simply paste, configure, and beautify your C program in seconds.
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Disclaimer: C is an ANSI/ISO standard programming language. "clang-format" is a trademark of LLVM/Clang contributors. "GCC" and "GNU" are trademarks of the Free Software Foundation. This tool is an independent, free online utility and is not affiliated with, endorsed by, or associated with any of these organizations. All formatting is performed entirely in your browser.