online cpp formatter

The tool formats C++ source code using configurable style rules. It accepts a C++ source string and returns a formatted version. Users include developers, code reviewers, educators, and teams seeking consistent style across repositories. It supports multiple presets (Google, LLVM, Mozilla, WebKit) and custom profiles; you can set line width, indentation, and brace style. It preserves comments and literals; it does not compile nor analyze runtime behavior. It outputs both the formatted code and a set of diagnostics if issues are encountered.
The formatter tokenizes input and applies style rules to arrange indentation, spacing, line breaks, and brace placement. It may normalize include ordering and apply spacing around operators. It relies on standard C++ language considerations (C++11/14/17/20) and does not rely on project-specific semantics. It can be used to clean up code before PRs, or to enforce an internal style guide across a codebase.
Unique value lies in quick, web-accessible formatting with both profile-based and custom configurations, enabling teams to align on a single code style without local tooling installation. It supports diagnostics to surface potential formatting ambiguities and ensures non-destructive edits when possible.
This tool is ideal for open-source maintainers, training sessions, and CI pipelines that require a formatted baseline as part of a pre-flight check.