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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThe four free and open-source options for formatting C# code are not interchangeable engines. CSharpier is a dedicated opinionated formatter. dotnet format applies .NET style preferences and analyzer recommendations. Roslynator provides formatting analyzers inside a wider Roslyn toolkit. CodeMaid is a Visual Studio cleanup extension that relies on Visual Studio’s own formatter. Choose by how your team wants formatting enforced, not by which tool sounds most complete.
Quick comparison
| Tool | Category | How it formats | Typical entry point | Best fit |
|---|---|---|---|---|
| CSharpier | Opinionated formatter for C# and XML | Parses code and reprints it with its own rules; formatting options are deliberately few | Global .NET tool: dotnet tool install csharpier -g, then csharpier format . |
Teams that want one consistent style and fewer whitespace debates |
dotnet format |
.NET code formatter | Applies style preferences and static analysis recommendations to a project or solution, reading .editorconfig when present and falling back to defaults otherwise |
Run against a project or solution with the .NET SDK | Teams that want style set in .editorconfig and enforced through standard .NET workflows |
| Roslynator | Roslyn-based analyzer and refactoring toolkit | Formatting analyzers delivered as NuGet analyzer packages, alongside IDE extensions, a command-line tool, testing support and client libraries | CLI: dotnet tool install -g roslynator.dotnet.cli |
Teams that want formatting diagnostics as part of broader code analysis |
| CodeMaid | Visual Studio extension | Cleanup that calls Visual Studio’s built-in formatting, removes and sorts using statements, and reorganizes members |
Runs on save or on demand from a file or solution, within Visual Studio | Visual Studio users who want cleanup applied automatically |
The four tools in detail
1. CSharpier: one fixed style, few knobs
CSharpier describes itself as an opinionated formatter for C# and XML. It parses your code and reprints it using its own rules, and the project keeps the number of formatting options limited on purpose. Its sample shows a long method invocation reflowed across several lines, which illustrates the approach: the formatter decides the layout, and you accept it.
That trade-off is the point. Consistency is easy to achieve, and arguments over individual spacing or line-break preferences largely disappear. The cost is that a repository with a carefully customized formatting convention may not match CSharpier’s output. The project documents editor integration, pre-commit hooks, build integration and programmatic use, so it can slot into most workflows. A NuGet package listing checked in early October 2026 showed version 1.3.0; confirm the current release on the package page before you pin a version.
2. dotnet format: rules from your .editorconfig
Microsoft’s .NET documentation describes dotnet format as “a code formatter that applies style preferences and static analysis recommendations to a project or solution.” Unlike CSharpier, it does not impose a style of its own. It reads preferences from .editorconfig, and if none is present it uses defaults. That makes the .editorconfig file the place where your team’s conventions live, and it is the file to review first.
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The same documentation warns that the command may restore packages, compile the project and run analyzers from the target project or solution. Run it only on code you trust, particularly on checkouts of unfamiliar repositories or in automated pipelines that process external pull requests.
3. Roslynator: formatting diagnostics within a larger toolkit
Roslynator is a set of C# analysis tools built on Roslyn. Its formatting analyzers are distributed as NuGet analyzer packages, and the same project offers IDE extensions, a command-line tool, testing support and client libraries. The project notes that analyzers are not bundled with the IDE extensions, so you add the NuGet packages to get the diagnostics.
Roslynator fits teams that already want static analysis and refactoring support and would like formatting checks to appear in that same stream of diagnostics. Support differs between Visual Studio and VS Code setups, and the project’s README describes caveats for each. Read the current README before deciding on an IDE setup, because those details change between releases.
4. 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 file or a solution. It can also reorder class members according to StyleCop conventions or a custom order you define.
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CodeMaid is not an independent formatter engine. Its formatting comes from Visual Studio, so its output follows whatever Visual Studio’s formatter does with your settings. It is a strong choice for Visual Studio users who want cleanup to happen automatically. It does not apply to other editors. Check the Visual Studio Marketplace listing for current Visual Studio compatibility, since extension support can change between Visual Studio releases.
Choosing between them
- Pick CSharpier if the team would rather accept one formatter’s output than maintain a list of style rules.
- Pick dotnet format if the team already maintains an
.editorconfigfile and wants the standard .NET SDK to enforce it. - Pick Roslynator if formatting checks should sit alongside broader analyzers and refactorings.
- Pick CodeMaid if the team works in Visual Studio and wants cleanup on save, with formatting handled by Visual Studio.
- Avoid running two formatters that rewrite the same files on every save or commit, because they can undo each other’s changes and produce noisy diffs.
Trying a shortlist safely
- Commit or branch your current state so the formatter’s changes appear as a clean, reviewable diff.
- Check for an
.editorconfigfile at the repository root. If you plan to usedotnet formatand none exists, its output will follow defaults rather than your team’s conventions. - Install one tool and run it on a single project, not the whole solution.
- Read the diff. Confirm the changes are whitespace and layout only, and that no logic or analyzer fixes slipped in unexpectedly.
- Only after the diff looks right, add the tool to a pre-commit hook or a CI step.
What this comparison does not establish
- It contains no benchmarks, speed comparisons or side-by-side tests of formatting output. Performance and output differences on your code have to be measured on your code.
- No reliable adoption, popularity or user satisfaction figures were available for these tools, so none are cited.
- Version numbers, SDK requirements and Visual Studio or VS Code compatibility change over time. Check each project’s repository, NuGet page or Marketplace listing on the day you install.
In Visual Studio Code, the official C# documentation describes formatting through C# Dev Kit and EditorConfig customization. That path is separate from all four tools above, with the exception of dotnet format, which runs from the command line regardless of editor.
Quick Recap
Rank #4
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