Java to Kotlin Converter

Convert Java code to Kotlin instantly with our online tool. Perfect for Android developers transitioning to Kotlin.

Java Code
Kotlin Code

Code Style

Class Conversion

Advanced

Key Features

Modern Java Conversion

Converts Java 8+ syntax to idiomatic Kotlin, including lambdas, streams, and optionals.

Android Support

Special handling for Android-specific Java code and common patterns.

Smart Analysis

Identifies patterns that can be converted to more concise Kotlin constructs.

How to Convert Java to Kotlin

  1. Paste your Java code in the left panel or upload a .java file
  2. Click "Convert to Kotlin" to transform your code
  3. Copy or download the resulting Kotlin code from the right panel
  4. Use the options panel to customize the conversion style

Supported Java Features

  • Classes, interfaces, and enums
  • Methods and properties
  • Loops and conditionals
  • Collections and streams
  • Annotations and generics