C# Formatter
FormattersFormat C# code with clang-format WASM using Microsoft style. Namespace indentation, K&R braces, method separation, 100-column limit. 100% browser-based.
About C# Formatter
The C# Formatter is a clang-format WASM-powered, browser-based tool that instantly formats C# source code using Microsoft style conventions. Using a WebAssembly port of clang-format in a Web Worker, it applies full namespace body indentation, K&R (attached) brace style, automatic blank lines between method and property definitions, a 100-column line limit, and configurable indent width. The output matches the style produced by `dotnet format` and `editorconfig` Microsoft defaults — without any installation. Your code never leaves the browser.
Features
- ✓Powered by clang-format WASM with BasedOnStyle: Microsoft
- ✓Full namespace body indentation (NamespaceIndentation: All)
- ✓K&R / attached brace style (BreakBeforeBraces: Attach)
- ✓Automatic blank lines between method, property, and field definitions
- ✓100-column line limit for consistent line wrapping
- ✓Configurable indent width: 2 spaces, 4 spaces, or tab
- ✓Handles attributes, LINQ expressions, async/await, records, and pattern matching
- ✓Web Worker execution — WASM runs off the main thread, UI stays responsive
- ✓Syntax-highlighted editor for both input and output
- ✓One-click clipboard copy of formatted output
- ✓Real-time byte-savings stats (input vs output size)
- ✓Language picker — instantly switch to Java, Python, Go, or 20+ other formatters
- ✓Mobile-responsive layout with a dedicated Format button
- ✓100% client-side — your code never leaves the browser
Common Use Cases
- Normalising C# class files to consistent Microsoft-style formatting before committing
- Formatting ASP.NET Core controllers, services, and minimal API endpoints
- Cleaning up auto-generated C# from Entity Framework migrations or protobuf tools
- Preparing readable C# snippets for documentation, README files, or code reviews
- Standardising indentation and brace style across a .NET solution
- Formatting C# POCO models, DTOs, and record types for readability
Frequently Asked Questions
QWhich C# style guide does this use?
BasedOnStyle: Microsoft in clang-format, with additional overrides for namespace indentation (All), brace style (Attach / K&R), and blank lines between definitions (SeparateDefinitionBlocks: Always).
QIs this equivalent to running `dotnet format`?
The output closely follows Microsoft's default C# style, but `dotnet format` also applies Roslyn-based diagnostics and code-fix suggestions. This tool focuses on whitespace and formatting only.
QDoes it support modern C# features?
Yes — records, primary constructors, pattern matching, init-only setters, nullable reference types, top-level statements, and C# 12 features are all formatted correctly.
QIs my code sent to a server?
No. The clang-format WASM binary runs entirely inside your browser in a Web Worker. No code is transmitted to any server.