How to use the C# Formatter
Format C# code in three steps:
1
Paste or upload your C# code
Paste a C# class, interface, or code snippet into the input panel, or upload a .cs file using the upload button.
2
Choose brace style and indent size
Select Allman style (Microsoft .NET convention — braces on new line) or K&R style. Choose 2 or 4 spaces for indentation.
3
Format, then copy or download
Click 'Format C#' to apply formatting and .NET syntax highlighting. Copy the result or download as a .cs file.
When to use this tool
Use the C# formatter when .NET code needs clean, consistent formatting before sharing:
- →Formatting C# code from Stack Overflow or GitHub issues that was pasted without indentation
- →Standardising brace placement across a team — Microsoft's .NET convention mandates Allman style
- →Reformatting auto-generated scaffolded code from dotnet CLI or Visual Studio templates
- →Preparing C# code snippets for Blazor, ASP.NET Core, or Unity tutorials and documentation
- →Cleaning up code from AI-generated C# before including it in a production codebase
- →Formatting C# interview solutions or coding challenge answers for readable submission
Frequently asked questions
Q:Why does Microsoft recommend Allman brace style for C#?
The .NET Runtime Coding Style and Microsoft C# Coding Conventions both specify Allman style — opening braces on their own line at the same indentation level as the block header. This is considered to improve readability for deeply nested code and aligns with the historical convention from C, C++, and Pascal that C# developers were migrating from when the language was introduced in 2000.
Q:Does the formatter support C# 10, 11, and 12 features?
Yes — modern C# keywords and constructs are supported in the syntax highlighting, including record types (record, record struct), init-only setters (init), required members (required), top-level statements, file-scoped namespaces, and the with expression. The indentation engine handles these constructs at the block level the same as traditional class and method bodies.
Q:Can it format LINQ queries and async/await patterns?
Yes — LINQ query syntax (from, where, select, orderby, group, join) and method-chain LINQ (.Where(), .Select(), .OrderBy()) are indented as regular code. async and await are recognised keywords. Multi-line LINQ chains are indented relative to their surrounding method body.
Q:Does it handle C# attributes like [ApiController] or [JsonProperty]?
Yes — attributes (single-line [Attribute] and multi-line [Attribute(...)]) are detected and kept at the same indentation level as the class or method member they decorate. They are highlighted in orange in the syntax output for easy visual identification.
Q:Is this suitable for Unity C# scripts?
Yes — Unity C# scripts follow standard C# syntax with Unity-specific attributes ([SerializeField], [Header], [Range]) and MonoBehaviour method patterns. All of these are formatted correctly. The tool is not Unity-specific but handles all Unity script patterns as valid C# code.
Q:What is the difference between C# and Java formatting conventions?
The most notable difference is brace placement: C# officially uses Allman style (new-line braces) while Java's Google Style Guide mandates K&R style (same-line braces). Both languages use 4-space indentation in their primary conventions. C# also uses PascalCase for methods (unlike Java's camelCase) and has unique constructs like properties, delegates, and records that have no direct Java equivalent.