Three simple steps
How to use this tool?
This free online converter translates Kotlin source code into Swift in three simple steps.
- Step 1
Add your Kotlin code
Type, paste, or upload the Kotlin code you want to translate.
- Step 2
Convert the code
Click Convert to translate the source code into Swift.
- Step 3
Review the result
Review, copy, or download the resulting Swift code from the output editor.
See it in action
Examples of Kotlin to Swift conversion
These examples show Kotlin source code and the corresponding Swift 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.
Kotlin code
Swift code
Example 2
Even or Odd
A well commented function to check if a number if odd or even.
Kotlin code
Swift code
Language comparison
Key differences between Kotlin and Swift
| Characteristic | Kotlin | Swift |
|---|---|---|
| Syntax | Kotlin has a syntax similar to Java, making it easy for Java developers to transition to Kotlin. | Swift has a syntax that is more concise and expressive compared to Kotlin. |
| Paradigm | Kotlin supports both object-oriented programming and functional programming paradigms. | Swift is primarily an object-oriented programming language but also supports some functional programming concepts. |
| Typing | Kotlin has static typing, which helps catch errors at compile-time. | Swift also has static typing, ensuring type safety and preventing runtime errors. |
| Performance | Kotlin has comparable performance to Java as it runs on the Java Virtual Machine (JVM). | Swift is known for its high performance and is optimized for iOS and macOS platforms. |
| Libraries and frameworks | Kotlin has good interoperability with Java libraries and frameworks. | Swift has a growing ecosystem of libraries and frameworks specifically designed for iOS and macOS development. |
| Community and support | Kotlin has a growing community and is backed by JetBrains, which provides strong support and regular updates. | Swift has a large and active community, with support from Apple and regular updates. |
| Learning curve | Kotlin has a relatively low learning curve, especially for Java developers. | Swift has a moderate learning curve, with a focus on modern programming concepts. |
Common questions
Frequently Asked Questions
How do I convert Kotlin to Swift?
Paste your Kotlin code into the input box, confirm the languages are set to Kotlin and Swift, and click Convert. CodeConvert AI analyzes your Kotlin code and generates equivalent Swift code in seconds, preserving the original logic and structure.
What are the main differences between Kotlin and Swift?
Kotlin and Swift differ in syntax, type system, standard libraries, and common idioms, so copying code line for line usually will not compile. The converter maps each Kotlin construct to its closest Swift equivalent. See the comparison table below for the key differences between Kotlin and Swift.
Is the converted Swift code accurate?
The AI produces high-quality Swift code that preserves the behavior of your original Kotlin code and follows Swift conventions. It handles common patterns, data structures, and idioms for both Kotlin and Swift. For large or performance-critical code, review and test the Swift output before using it in production.
Can I convert an entire Kotlin project to Swift?
You can convert Kotlin 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 Kotlin to Swift. Signing in for free raises the input limit to 25,000 characters per conversion for larger files.
Can I convert Swift back to Kotlin?
Yes. CodeConvert AI converts in both directions, so you can convert Swift to Kotlin just as easily using our Swift to Kotlin converter. Try the Swift to Kotlin Converter
Is the Kotlin to Swift 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 Kotlin to Swift 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.
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