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How do I encode and decode a base64 string in C#?


Encode

To encode base64 in C# we will need first to convert the string to Bytes using method System.Text.Encoding.UTF8.GetBytes(), then we will convert the bytes to Base64String using method System.Convert.ToBase64String()

Example

In below example we created a method Base64Encode() that does above steps

using System;
					
public class Program
{
	public static string Base64Encode(string plainText) {
	  var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(plainText);
	  return System.Convert.ToBase64String(plainTextBytes);
	}
	public static void Main()
	{
		Console.WriteLine(Base64Encode("Hello World"));
	}
}

Output

SGVsbG8gV29ybGQ=


Decode

To encode base64 in C# we will need first to convert the string to Bytes using method System.Convert.FromBase64String(), then we will convert the bytes to Base64String using method System.Text.Encoding.UTF8.GetString()

Example

In below example we created a method Base64Decode() that does above steps

using System;
					
public class Program
{
	public static string Base64Decode(string base64EncodedData) {
	  var base64EncodedBytes = System.Convert.FromBase64String(base64EncodedData);
	  return System.Text.Encoding.UTF8.GetString(base64EncodedBytes);
	}
	public static void Main()
	{
		Console.WriteLine(Base64Decode("SGVsbG8gV29ybGQ="));
	}
}

Output

Hello World


Conclusion

In this page (written and validated by ) you learned about How do I encode and decode a base64 string in C#? . What's Next? If you are interested in completing C# tutorial, we encourage you simply to start here: C# Tutorial.



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