C Formatter and Beautifier
Format and beautify C source code with consistent indentation and style.
Keep your C code readable and consistent with the C Formatter & Beautifier. Paste any snippet, pick an indent width, and the tool applies sensible spacing, indentation, and line wrapping based on a set of pragmatic defaults inspired by clang-format and classic K&R style.
Capabilities
- Smart indentation: Choose 2, 4, 6, or 8 spaces to match team preferences.
- Whitespace cleanup: Consolidates stray line breaks, aligns braces, and adds trailing newlines.
- Live preview: The formatter runs after a short debounce so you see changes without hammering the CPU.
- File-ready output: Download the formatted version as
formatted.cor copy it back into your editor. - Error handling: If js-beautify encounters an issue, the tool notifies you and highlights the problem area.
Formatting tips
- Paste or upload your source into the left panel. The tool supports headers, implementation files, and snippets.
- Use the slider beneath the editor to match your indent preference. The preview updates immediately.
- Use “Clear” when you want to reset both editors for a fresh session.
- Download or copy the cleaned result from the right panel and drop it into your IDE or code review.
Ideal scenarios
- Preparing snippets for documentation or technical blog posts.
- Cleaning up code pasted from email, Slack, or PDF manuals.
- Reviewing student submissions or code katas where formatting varies wildly.
Frequently Asked Questions
Does it follow a specific style guide?
The defaults are inspired by classic K&R/Allman hybrids. For strict project rules, run clang-format locally, but this tool is great for quick cleanup.
Can I format other languages?
This page focuses on C. For C++, JavaScript, Python, and more, browse the Formatter category on onlineminitools.com.
How big of a file can I format?
Modern browsers comfortably handle thousands of lines. For multi-megabyte codebases, format individual functions or modules for the best experience.
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