diff --git a/AIStudio.Wpf.DiagramDesigner/Helpers/BitmapHelper.cs b/AIStudio.Wpf.DiagramDesigner/Helpers/BitmapHelper.cs
index b33d7ed..5d361b4 100644
--- a/AIStudio.Wpf.DiagramDesigner/Helpers/BitmapHelper.cs
+++ b/AIStudio.Wpf.DiagramDesigner/Helpers/BitmapHelper.cs
@@ -2,6 +2,7 @@
 using System.Drawing;
 using System.Drawing.Imaging;
 using System.IO;
+using System.IO.Pipes;
 using System.Runtime.InteropServices.ComTypes;
 using System.Windows;
 using System.Windows.Media.Imaging;
@@ -268,5 +269,52 @@ namespace AIStudio.Wpf.DiagramDesigner
             return bitmapImage;
 
         }
+
+        public static string ToBase64String(this Stream stream)
+        {
+            byte[] bytearray = new byte[stream.Length];
+            stream.Seek(0, SeekOrigin.Begin);
+            stream.Read(bytearray, 0, bytearray.Length);
+
+            return Convert.ToBase64String(bytearray);
+        }
+
+        public static MemoryStream ToMemoryStream(this string base64String, int width = 0, int height = 0)
+        {
+            if (string.IsNullOrEmpty(base64String))
+                return null;
+
+            try
+            {
+                var byteArray = Convert.FromBase64String(base64String);
+                var stream = new MemoryStream(byteArray);
+                stream.Seek(0, SeekOrigin.Begin);
+
+                return stream;
+            }
+            catch
+            {
+                return null;
+            }
+        }
+
+        public static FileStream ToFileStream(this string base64String, string filename, int width = 0, int height = 0)
+        {
+            if (string.IsNullOrEmpty(base64String))
+                return null;
+
+            try
+            {
+                var byteArray = Convert.FromBase64String(base64String);
+                FileStream fs = new FileStream(filename, FileMode.OpenOrCreate, FileAccess.ReadWrite);
+                fs.Write(byteArray, 0, byteArray.Length);
+                fs.Seek(0, SeekOrigin.Begin);
+                return fs;
+            }
+            catch
+            {
+                return null;
+            }
+        }
     }
 }