ISO C23 / C17 / C11 / C99 / C89 Beautifier, Minifier & Execution Console

C Formatter

Beautify, format, validate, and minify C source code with C23 compliance, K&R / Allman brace styles, preprocessor macro preservation, function pointers, pointer qualifiers, document analytics, and safe sandboxed console execution preview.

Load Preset Template:
Indent Size:
Indent Type:
C Standard:
Brace Style:
Input C Source Code
0 chars
0 chars
C Structure Valid: No syntax or preprocessor errors detected.
Valid C23
Lines:0|Input Chars:0|Output Chars:0|Byte Size:0 B|Includes & Directives:0|Structs, Unions & Enums:0|Typedefs:0|Functions & Pointers:0|Docstrings & Comments:0
ISO C Standard Formatting Standards & Developer Specification Reference
ISO C23 / C11 Features

Full support for _Generic macro dispatch, _Static_assert, _Atomic types, designated initializers (.id = 1), and bit-fields.

Security Safeguards

Treats C code strictly as text data for formatting. NEVER compiles, links, or executes binaries on the host machine, protecting server credentials.

K&R & Allman Styles

Support for K&R (Same Line {) and Allman (New Line \n{) brace styles, function pointer preservation (int (*fn)(int)), and pointer qualifiers.

Preprocessor & Directives

Preprocessor directives (#include, #define, #ifdef) and multiline macros with \ line continuations are preserved verbatim.