Base64 Decode Kotlin with Our Free Tool

Below is a list of libraries that support Base64 encoding and decoding in Kotlin along with sample code for each library.

1. Java Standard Library (java.util.Base64)

The Java Standard Library provides the java.util.Base64 class for Base64 encoding and decoding, which can be used in Kotlin.

import java.util.Base64

fun main() {
    val originalString = "test input"
    
    // Encode
    val encodedString = Base64.getEncoder().encodeToString(originalString.toByteArray())
    println("Encoded: $encodedString")
    
    // Decode
    val decodedBytes = Base64.getDecoder().decode(encodedString)
    val decodedString = String(decodedBytes)
    println("Decoded: $decodedString")
}

    

2. Apache Commons Codec

The Apache Commons Codec library provides utilities for Base64 encoding and decoding, which can be used in Kotlin.

import org.apache.commons.codec.binary.Base64

fun main() {
    val originalString = "test input"
    
    // Encode
    val encodedString = Base64.encodeBase64String(originalString.toByteArray())
    println("Encoded: $encodedString")
    
    // Decode
    val decodedBytes = Base64.decodeBase64(encodedString)
    val decodedString = String(decodedBytes)
    println("Decoded: $decodedString")
}

    

Add the dependency to build.gradle (Gradle):

dependencies {
    implementation 'commons-codec:commons-codec:1.15'
}

    

3. Bouncy Castle

Bouncy Castle is a powerful encryption library that supports Base64 encoding and decoding, which can be used in Kotlin.

import org.bouncycastle.util.encoders.Base64

fun main() {
    val originalString = "test input"
    
    // Encode
    val encodedString = String(Base64.encode(originalString.toByteArray()))
    println("Encoded: $encodedString")
    
    // Decode
    val decodedBytes = Base64.decode(encodedString.toByteArray())
    val decodedString = String(decodedBytes)
    println("Decoded: $decodedString")
}

    

Add the dependency to build.gradle (Gradle):

dependencies {
    implementation 'org.bouncycastle:bcprov-jdk15on:1.70'
}

    

4. Kotlinx Serialization

Kotlinx Serialization library also supports Base64 encoding and decoding.

import kotlinx.serialization.encodeToString
import kotlinx.serialization.decodeFromString
import kotlinx.serialization.json.Json
import kotlinx.serialization.Serializable
import kotlinx.serialization.encodeToByteArray
import kotlinx.serialization.decodeFromByteArray

@Serializable
data class Data(val content: String)

fun main() {
    val originalData = Data("test input")
    
    // Encode
    val encodedString = Base64.getEncoder().encodeToString(Json.encodeToByteArray(originalData))
    println("Encoded: $encodedString")
    
    // Decode
    val decodedBytes = Base64.getDecoder().decode(encodedString)
    val decodedData = Json.decodeFromByteArray(decodedBytes)
    println("Decoded: ${decodedData.content}")
}

    

Add the dependency to build.gradle (Gradle):

dependencies {
    implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.3.3"
}

    

5. kotlin-stdlib

The Kotlin Standard Library itself provides basic support for Base64 encoding and decoding using extension functions.

import java.util.Base64

fun ByteArray.toBase64(): String = Base64.getEncoder().encodeToString(this)
fun String.fromBase64(): ByteArray = Base64.getDecoder().decode(this)

fun main() {
    val originalString = "test input"
    
    // Encode
    val encodedString = originalString.toByteArray().toBase64()
    println("Encoded: $encodedString")
    
    // Decode
    val decodedString = String(encodedString.fromBase64())
    println("Decoded: $decodedString")
}

    

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Why Use Base64 Encoding?

Base64 encoding is a method of converting binary data into a text format using 64 characters. This encoding scheme is especially useful when you need to transfer or store data over media designed to handle text, such as email or JSON files. Base64 ensures your data remains intact and unmodified during transport.

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Advanced Options

Character Set Selection

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How to Base64 Decode Kotlin

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1. Enter your data:Paste your text or binary data into the input field.
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Example of Base64 Encoding

Here’s a quick example. Encoding the string "Hello, World!" in Base64 yields:

SGVsbG8sIFdvcmxkIQ==

In this example, the characters "H", "e", "l", "l", "o", ",", " ", "W", "o", "r", "l", "d", "!" are encoded into Base64 format, providing a safe and efficient way to transmit text data.