Four free, open-source tools cover most C# formatting needs, but they do not work the same way. CSharpier reprints your code in its own opinionated style. dotnet format applies your style preferences and analyzer recommendations to a project or solution. Roslynator is a Roslyn-based analyzer toolkit whose formatting analyzers are one part of a larger suite. CodeMaid is a Visual Studio cleanup extension that relies on Visual Studio’s own formatter. The right choice depends on how much style control your team wants and which environment your developers use.
How the four tools compare
| Tool | What it is | Formatting approach | Typical entry point | Configuration | Environment |
|---|---|---|---|---|---|
| CSharpier | Opinionated formatter for C# and XML | Parses code and reprints it with its own rules; formatting options are deliberately limited | dotnet tool install csharpier -g, then csharpier format . |
Few options by design; a configuration file format is not described in the project’s documentation summary used here | Command line, editors, pre-commit hooks, builds, and programmatic use |
dotnet format |
.NET code formatter | Applies style preferences and static-analysis recommendations to a project or solution | Run against a project or solution with the .NET SDK | .editorconfig when present; built-in defaults otherwise |
.NET projects and solutions |
| Roslynator | Roslyn-based analyzer and refactoring toolkit | Formatting analyzers report diagnostics within a broader analysis suite | NuGet analyzer packages, IDE extensions, or the CLI installed with dotnet tool install -g roslynator.dotnet.cli |
Not stated in the sources reviewed | IDE support differs between Visual Studio and VS Code setups |
| CodeMaid | Open-source Visual Studio cleanup extension | Cleanup calls Visual Studio’s built-in formatting, plus using-statement and member organization | Runs on save or on demand for a file or solution | Not stated in the sources reviewed | Visual Studio extension |
The four tools, one at a time
CSharpier: one fixed style, few decisions
CSharpier calls itself an opinionated formatter for C# and XML. It parses your code and reprints it using its own rules, and the project keeps formatting options limited on purpose. That design removes debates over individual whitespace preferences, but it also means the output will not follow a highly customized house style.
Install it as a global .NET tool with dotnet tool install csharpier -g, then run csharpier format . from the root of your code. The project documents use in editors, pre-commit hooks, build steps, and programmatic workflows. Its own sample shows a long method invocation being reflowed across several lines. At the time of writing, the NuGet package listing showed CSharpier 1.3.0; treat that as a snapshot and check the listing for newer releases.
dotnet format: rules from .editorconfig
Microsoft’s .NET documentation describes the tool this way: “dotnet format is a code formatter that applies style preferences and static analysis recommendations to a project or solution.” It reads preferences from an .editorconfig file when one is present and falls back to defaults when none exists. If your team already expresses style rules in .editorconfig, this tool enforces those rules rather than replacing them with a fixed look.
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The same documentation warns that the tool may restore packages, compile the project, and run analyzers from the target project or solution. Run it only on code you trust, and treat that as a real consideration in CI systems that process external contributions.
Roslynator: formatting diagnostics inside a larger toolkit
Roslynator is a set of C# analysis tools built on Roslyn. Its repository lists formatting analyzers among its NuGet analyzer packages, alongside IDE extensions, a command-line tool, testing support, and client libraries. Choose it when you want formatting diagnostics as part of a wider analyzer and refactoring toolkit, not because you need a single-purpose formatter.
Two details matter during setup. The project states that analyzers are not included in the IDE extensions and that users should take diagnostics from the NuGet packages. Also, the README describes different IDE support and caveats for Visual Studio and VS Code, so confirm your editor’s behavior before relying on it.
CodeMaid: cleanup inside Visual Studio
CodeMaid is an open-source Visual Studio extension. Its cleanup feature can apply Visual Studio’s built-in formatting, remove and sort using statements, and run on save or on demand for a single file or an entire solution. It can also reorder C# members according to StyleCop conventions or your own preferences.
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Choosing among them
- Your team wants no style debates and accepts one fixed output: choose CSharpier.
- Your team already keeps style rules in
.editorconfigand wants them applied to projects: choosedotnet format, after reviewing the restore and analyzer caution above. - You want formatting diagnostics alongside analysis and refactoring tools: choose Roslynator.
- Your developers work in Visual Studio and want cleanup on save: choose CodeMaid.
Running two formatters over the same files can produce competing edits, so name one tool as the formatting authority for each repository and let the others handle only what it does not cover.
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Before you install
- Confirm the environment. The tools above assume the .NET SDK for CLI use. For VS Code, Microsoft’s C# documentation describes formatting through C# Dev Kit and EditorConfig customization.
- Check the current release and compatibility on each project’s repository, NuGet listing, or Visual Studio Marketplace page. Extension support, SDK requirements, and IDE behavior change over time.
- Choose one formatting authority per repository, as described above.
- Run the tool on a branch and review the resulting diff before committing. Formatting-only changes can make history harder to read if they land mixed with feature work.
- For
dotnet format, confirm that the code you are running against is trusted before adding it to automated builds.
What this comparison does and does not establish
This guide is based on official documentation and project pages. It does not include side-by-side formatting tests, speed benchmarks, or adoption figures, so it does not rank the tools by output quality or popularity. The useful comparison is between their designs: a fixed opinionated style, a rules-driven .NET formatter, an analyzer suite, and a Visual Studio cleanup extension.
Also note that Roslynator’s and CodeMaid’s behavior depends on the IDE version you run, so check those details against the current documentation before rolling a tool out to a team.
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