C code formatter — format C code neatly in your browser
The C code formatter uses clang-format compiled to WebAssembly to turn pasted C source into consistently formatted code. Select a base style such as LLVM, GNU, or Google, then set indentation and a column limit to shape the output. It adjusts code presentation and processes your input in the browser without sending it to a server.
The C code formatter is a browser-based tool for making C source easier to read and review. It uses clang-format compiled to WebAssembly, the same engine used by IDEs. Paste or drop your C input, choose a base style, and get formatted code without needing to run a local formatting command.
The formatter supports base styles including LLVM, GNU, and Google. You can also choose the indentation and set a column limit to influence the layout. These settings control how the code is presented; the purpose of formatting is to make its structure more consistent and readable, not to change what the code is intended to do.
C is a programming language, while formatting conventions describe how its source code is laid out. A formatter is useful when generated or unfamiliar code is difficult to scan, when a document needs to follow a particular style, or when whitespace differences make a code review harder. Consistent formatting can help readers focus on meaningful code changes.
The C Beautifier runs entirely in your browser: your input is processed on your device and is not uploaded, stored, or sent to a server. It works offline after the page has loaded, and the tool is free to use. Developers and DevOps engineers can use it to prepare C code for reviews, reports, handoffs, or everyday reading.
Step 1: Paste or drop your C source into the tool. It accepts C input for formatting.
Step 2: Choose a base style, such as LLVM, GNU, or Google. The selected style guides how clang-format lays out your code.
Step 3: Set the indentation and column limit to suit your formatting needs. These options affect the appearance of the formatted output.
Step 4: Review and copy the formatted C code. If formatting does not succeed, check the input for a parsing problem.
Use case: Make an unreadable, machine-generated C file easier to review before you commit it. A consistent layout helps you focus on the code rather than its formatting.
Use case: Check a C document you did not write against the style you need to follow. Choose a base style and adjust indentation or the column limit.
Use case: Produce consistently indented output so a diff shows code changes instead of avoidable whitespace differences.
Use case: Format a C snippet before pasting it into a bug report or code review. Clear formatting makes the snippet easier for others to read.
Use case: Check whether C input can be formatted, and use any parsing feedback to help locate where the input needs attention.
Use case: Apply a familiar base style to C source when preparing it for a review or handoff. Options include LLVM, GNU, and Google.
Use case: Clean up the layout of a short C example before sharing it with teammates, without installing a formatter on your device.