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Home Forums How do I encode and decode a base64 string in C#? – MindStick
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1 Answers

Aryan Kumar
Aryan Kumar 13 Jul 2023
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Sure, here is how to encode and decode a base64 string in C#:

Encoding a string to base64

To encode a string to base64, you can use the Convert.ToBase64String() method. This method takes a byte array as a parameter and returns a base64 encoded string.

For example, the following code encodes the string "Hello, world!" to base64:

C#

string myString = "Hello, world!";

byte[] myBytes = Encoding.UTF8.GetBytes(myString);

string base64String = Convert.ToBase64String(myBytes);

Decoding a base64 string

To decode a base64 string, you can use the Convert.FromBase64String() method. This method takes a base64 encoded string as a parameter and returns a byte array.

For example, the following code decodes the base64 string "SGVsbG8gV29ybGQh" to the string "Hello, world!":

C#

string base64String = "SGVsbG8gV29ybGQh";

byte[] myBytes = Convert.FromBase64String(base64String);

string myString = Encoding.UTF8.GetString(myBytes);

Here is a complete example of how to encode and decode a base64 string in C#:

C#

using System;
using System.Text;

public class Base64EncodeDecode
{
    public static void Main(string[] args)
    {
        // Encode a string to base64.
        string myString = "Hello, world!";
        byte[] myBytes = Encoding.UTF8.GetBytes(myString);
        string base64String = Convert.ToBase64String(myBytes);

        // Decode a base64 string.
        string decodedString = Convert.FromBase64String(base64String);

        // Print the decoded string.
        Console.WriteLine(decodedString);
    }
}
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