How to Encode and Decode String With Base64 in C#

Tutorialsrack 13/02/2022 C#

In this article, you will learn how to encode and decode strings with base64 in C#. We will use the Convert.ToBase64String() method to encode the string and Convert.FromBase64String() method to decode the string.

Here are the examples to encode the plain text to Base64 and decode the plain text from Base64 using C#.

Encoding String to Base64

This method is used to Encode plain text to Base64 string.

//Encode Plain Text To Base64 String
public static string ToBase64Encode(string text) 
{
	if (String.IsNullOrEmpty(text)) {
		return text;
	}
 
	byte[] textBytes = System.Text.Encoding.UTF8.GetBytes(text);
	return Convert.ToBase64String(textBytes);
}

Decoding String From Base64

This method is used to decode plain text from a Base64 string.

//Decode Plain Text From Base64 String
public static string ToBase64Decode(string base64EncodedText) 
{
	if (String.IsNullOrEmpty(base64EncodedText)) {
		return base64EncodedText;
	}
 
	byte[] base64EncodedBytes = Convert.FromBase64String(base64EncodedText);
	return System.Text.Encoding.UTF8.GetString(base64EncodedBytes);
}

Example: Base64 Encode and Decode in C#

using System;
 
namespace Program
{
    public class Program
    {
        //Encode Plain Text To Base64 String
        public static string ToBase64Encode(string text)
        {
            if (String.IsNullOrEmpty(text))
            {
                return text;
            }
 
            byte[] textBytes = System.Text.Encoding.UTF8.GetBytes(text);
            return Convert.ToBase64String(textBytes);
        }
 
        //Decode Plain Text From Base64 String
        public static string ToBase64Decode(string base64EncodedText)
        {
            if (String.IsNullOrEmpty(base64EncodedText))
            {
                return base64EncodedText;
            }
 
            byte[] base64EncodedBytes = Convert.FromBase64String(base64EncodedText);
            return System.Text.Encoding.UTF8.GetString(base64EncodedBytes);
        }
 
        public static void Main()
        {
            string str = "Hello, TutorialsRack!";
 
            string encodedText = ToBase64Encode(str);
            Console.WriteLine("Base64 Encoded String: " + encodedText);
 
            string decodedText = ToBase64Decode(encodedText);
            Console.WriteLine("Base64 Decoded String: " + decodedText);
 
            Console.ReadLine();
        }
    }
}

I hope this article will help you to understand how to encode and decode strings with base64 in C#.

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