Free TOML to C# Converter — generate C# classes from TOML in your browser

🧬 TOML to C# — Free Online Tool

Convert TOML to C# online, free. TOML is a readable configuration format built around key/value pairs and tables. C# classes model data for .NET with System.Text.Json support. TOML to C# conversion parses your TOML against the TOML v1.0.0 grammar (https://toml.io/en/v1.0.0), builds an in-memory model of its keys, nested objects and arrays, then emits ready-to-use C# types with System.Text.Json attributes following the C# language reference conventions. Processing runs in your browser in JavaScript with no upload or server round-trip — no size limit beyond your device's memory, so multi-megabyte documents convert in milliseconds and sensitive payloads never leave your machine. Typical uses include .NET APIs, desktop apps and Azure functions.

🚀 Why use this TOML to C# tool?

It maps the full structure of your TOML onto idiomatic C# types, following the C# language reference conventions. 100% free, no registration, and complete privacy — everything runs locally in your browser, so your data never touches a server.

Key Features

Instant, in-browser

Paste TOML and generate C# types from C# immediately. Conversion runs client-side, so there is no upload wait and large documents stay fast.

🧩Structure-aware mapping

Nested TOML objects, tables and arrays are mapped faithfully onto C#, including nested types and optional fields.

🔒100% private

Your TOML never leaves your device — everything is processed locally in JavaScript, with nothing logged or stored.

🆓Free, no signup

Unlimited conversions with no account, no quotas, and no watermark. Works on desktop and mobile.

Popular Use Cases

Typed models from samples

  • Turn a sample TOML payload into C# types
  • Skip hand-writing boilerplate models
  • Keep front-end and back-end shapes in sync

.NET APIs

  • .NET APIs
  • desktop apps
  • Azure functions

Onboarding a new API

  • Paste an example TOML response
  • Get typed C# to consume it safely
  • Catch shape mismatches at compile time

What It Handles

Structure

  • Nested objects & tables
  • Arrays / lists
  • Deeply nested documents

Values

  • Inferred types (string, number, boolean)
  • Optional / nullable fields
  • Nested type names

Workflow

  • Copy or download output
  • Load an example to try it
  • Validate & format the input

Example Output

Example: TOML → C#

public class User
{
    public string Name { get; set; }
    public int Age { get; set; }
    public string? Email { get; set; }
}

Sources & References

Frequently Asked Questions

How do I convert TOML to C#?

Converting TOML to C# is simple with our free online tool. Just paste or upload your TOML data, click the "Convert to C#" button, and get instant results. The conversion happens in your browser, ensuring privacy and speed. No registration or installation required.

Is this TOML to C# converter free?

Yes! Our TOML to C# converter is completely free to use with no limitations. You can convert unlimited files, and there are no hidden fees, registration requirements, or usage restrictions. All processing happens locally in your browser for maximum privacy.

Can I convert large TOML files to C#?

Yes, our tool can handle TOML files of various sizes. Since the conversion happens in your browser, the limit depends on your device's memory. Most modern browsers can handle files up to several megabytes without issues. For very large files, ensure you have sufficient RAM available.

Is my data safe when converting TOML to C#?

Absolutely! Your data never leaves your device. All TOML to C# conversion happens locally in your browser using JavaScript. We don't upload, store, or transmit your data to any server. This ensures complete privacy and security for sensitive information.

What is the difference between TOML and C#?

TOML (Tom's Obvious Minimal Language) (TOML) and C# classes (C#) are different serialization formats, each with its own syntax and strengths. Data often needs to move between them when integrating tools, APIs, or configuration systems that expect a specific format. This converter maps the structure of your TOML onto valid C# so you can use it wherever C# is required.

Can I use this TOML to C# converter on mobile?

Yes! Our TOML to C# converter works perfectly on mobile devices (smartphones and tablets) as well as desktop computers. The responsive design ensures a smooth experience on any screen size. Just open https://tools.seagit.com/toml-to-csharp in your mobile browser.

Does the converter validate my TOML before conversion?

Yes, our tool includes built-in TOML validation. If your TOML data contains syntax errors, you'll receive clear error messages indicating what needs to be fixed. This helps ensure your converted C# output is accurate and valid.

🎓 Pro Tips

  • Tip 1: Validate or format your TOML first (the Validate / Format buttons) so the converter works from clean, TOML v1.0.0-conformant input.
  • Tip 2: Give the tool a representative TOML sample — optional fields are only detected from the keys actually present, so include them if they matter.
  • Tip 3: Authoritative reference for the input format: TOML v1.0.0 — https://toml.io/en/v1.0.0.
  • Tip 4: For the output, follow the C# language reference (https://learn.microsoft.com/dotnet/csharp/) conventions in your codebase.