C# Formatter Online — Format C# Code

Microsoft's C# language conventions specify Allman braces (opening brace on its own line) and 4-space indentation. The OpenFormatter C# formatter applies these defaults — the same conventions Visual Studio, Roslyn, and the .NET runtime source code use. Formatting is purely cosmetic: outside of strings and verbatim literals, the compiled IL is identical.

How to format C# code — 4 steps

1. Paste your C# code. Copy a class, method, LINQ query, or any C# snippet into the Input panel. Click Load Sample to try a demo class.
2. Click Format. The formatter applies Allman braces and 4-space indentation client-side — no upload.
3. Review the output. The Output panel shows beautified C# ready to drop back into Visual Studio, Rider, or VS Code.
4. Copy the result. Click Copy to paste the formatted code into your editor, pull request, or code review.

Side-by-side: unformatted vs formatted C#

public class Order{public int Id{get;set;}public decimal Calculate(decimal tax){var sub=0m;foreach(var i in Items){sub+=i.Price;}return sub*(1+tax);}}

public class Order
{
    public int Id { get; set; }
    public decimal Calculate(decimal tax)
    {
        var sub = 0m;
        foreach (var i in Items)
        {
            sub += i.Price;
        }
        return sub * (1 + tax);
    }
}

Common use cases

• check_circleFormat auto-generated C# from EF Core migrations or scaffold-dbcontext output
• check_circleReformat C# copied from Stack Overflow or Microsoft Learn to match project style
• check_circleBeautify code emitted by Roslyn source generators before committing
• check_circleNormalise C# indentation after a merge conflict resolution
• check_circleFormat C# inside a pull request review when the diff is unreadable
• check_circleClean up T4 template output before adding it to a release build
• check_circleReformat LINQ method-chain queries onto multiple lines for readability
• check_circleBeautify C# pasted from a chat, gist, or documentation site for sharing

Online formatter vs dotnet format vs Roslyn

An online formatter is the fastest option for one-off snippets — paste, click, copy. dotnet format is the official CLI: it reads your .editorconfig, applies project-wide rules (using-directive ordering, modifier sorting, naming), and is the right tool for CI enforcement. Roslyn analyzers and code-fix providers go further still — they catch semantic issues like unused variables and suggest refactorings. Use this online tool for quick paste-and-format; configure dotnet format in your repo and a pre-commit hook for project-wide enforcement.