Three simple steps
How to use this tool?
This free online converter translates C# source code into Kotlin in three simple steps.
- Step 1
Add your C# code
Type, paste, or upload the C# code you want to translate.
- Step 2
Convert the code
Click Convert to translate the source code into Kotlin.
- Step 3
Review the result
Review, copy, or download the resulting Kotlin code from the output editor.
See it in action
Examples of C# to Kotlin conversion
These examples show C# source code and the corresponding Kotlin translation. Generated results can vary as AI models are updated.
Example 1
Is String Palindrome
Program that checks if a string is a palindrome or not.
C# code
Kotlin code
Example 2
Even or Odd
A well commented function to check if a number if odd or even.
C# code
Kotlin code
Language comparison
Key differences between C# and Kotlin
| Characteristic | C# | Kotlin |
|---|---|---|
| Syntax | C# syntax is similar to C++ and Java, with curly braces and semicolons to denote blocks and statements. It also supports LINQ (Language Integrated Query) for querying data from various sources. | Kotlin syntax is similar to Java, but with some improvements such as null safety, extension functions, and smart casts. It also supports functional programming concepts such as lambdas and higher-order functions. |
| Paradigm | C# supports both object-oriented programming and functional programming paradigms. | Kotlin supports both object-oriented programming and functional programming paradigms, with a focus on functional programming. |
| Typing | C# is a statically typed language, which means that the type of a variable is determined at compile-time. | Kotlin is a statically typed language, which means that the type of a variable is determined at compile-time. It also supports type inference, which allows the compiler to determine the type of a variable based on its usage. |
| Performance | C# is known for its high performance, especially when used with the .NET framework. | Kotlin is a relatively new language and its performance is still being evaluated. However, it is designed to be highly interoperable with Java, which is known for its performance. |
| Libraries and frameworks | C# has a large number of libraries and frameworks available, including the .NET framework, which provides a wide range of functionality for building Windows applications, web applications, and more. | Kotlin has a growing number of libraries and frameworks available, including Spring Boot, Ktor, and Android KTX. |
| Community and support | C# has a large and active community, with many resources available for learning and development. | Kotlin has a growing community, with many resources available for learning and development. It is also supported by Google for Android development. |
| Learning curve | C# has a moderate learning curve, especially for developers with experience in C++ or Java. | Kotlin has a relatively easy learning curve, especially for developers with experience in Java. |
Common questions
Frequently Asked Questions
How do I convert C# to Kotlin?
Paste your C# code into the input box, confirm the languages are set to C# and Kotlin, and click Convert. CodeConvert AI analyzes your C# code and generates equivalent Kotlin code in seconds, preserving the original logic and structure.
What are the main differences between C# and Kotlin?
C# and Kotlin differ in syntax, type system, standard libraries, and common idioms, so copying code line for line usually will not compile. The converter maps each C# construct to its closest Kotlin equivalent. See the comparison table below for the key differences between C# and Kotlin.
Is the converted Kotlin code accurate?
The AI produces high-quality Kotlin code that preserves the behavior of your original C# code and follows Kotlin conventions. It handles common patterns, data structures, and idioms for both C# and Kotlin. For large or performance-critical code, review and test the Kotlin output before using it in production.
Can I convert an entire C# project to Kotlin?
You can convert C# files one at a time by pasting each file's code. For a full migration, convert each file and then review how classes, dependencies, and project structure map from C# to Kotlin. Signing in for free raises the input limit to 25,000 characters per conversion for larger files.
Can I convert Kotlin back to C#?
Yes. CodeConvert AI converts in both directions, so you can convert Kotlin to C# just as easily using our Kotlin to C# converter. Try the Kotlin to C# Converter
Is the C# to Kotlin converter free, and do I need to install anything?
Yes, it is free and runs in your browser with nothing to install and no IDE extension required. You can convert C# to Kotlin without an account for up to 2 conversions per day. Sign in for free for higher limits.
What are the benefits of signing in?
Signing in unlocks CodeConvert AI's Pro converter with more powerful AI models, a built-in chat assistant, code execution, saved conversion history, and personal notes. Every free account includes 5 credits and supports up to 25,000 characters of input per conversion, with no credit card required.
More free tools