Convert String to Base64 and Base64 to String

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System.Text.Encoding class provides methods to convert String to Base64 and vice-versa.

Convert String to Base64

First convert the string to a byte array and then use the Convert.ToBase64String() method to convert the byte array to a Base64 string.

C#

    byte[] byt = System.Text.Encoding.UTF8.GetBytes(strOriginal);

    // convert the byte array to a Base64 string

    strModified = Convert.ToBase64String(byt);

VB.NET

    Dim byt As Byte() = System.Text.Encoding.UTF8.GetBytes(strOriginal)

    ' convert the byte array to a Base64 string

    strModified = Convert.ToBase64String(byt)

Convert Base64 string to String

In order to convert a Base64 string back to the original string, use FromBase64String(). First FromBase64String() converts the string to a byte array and then use the relevant Encoding method to convert the byte array to a string, in our case UTF8.GetString();

C#

    byte[] b = Convert.FromBase64String(strModified);

    strOriginal = System.Text.Encoding.UTF8.GetString(b);

VB.NET

    Dim b As Byte() = Convert.FromBase64String(strModified)

    strOriginal = System.Text.Encoding.UTF8.GetString(b)

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About The Author

Suprotim Agarwal, Developer Technologies MVP (Microsoft Most Valuable Professional) is the founder and contributor for DevCurry, DotNetCurry and SQLServerCurry. He is the Chief Editor of a Developer Magazine called DNC Magazine. He has also authored two Books - 51 Recipes using jQuery with ASP.NET Controls. and The Absolutely Awesome jQuery CookBook.

Follow him on twitter @suprotimagarwal.