diff --git a/app/src/main/kotlin/org/ntlab/leftoverrecipe/util/BitmapUtil.kt b/app/src/main/kotlin/org/ntlab/leftoverrecipe/util/BitmapUtil.kt
new file mode 100644
index 0000000..ebeca5b
--- /dev/null
+++ b/app/src/main/kotlin/org/ntlab/leftoverrecipe/util/BitmapUtil.kt
@@ -0,0 +1,22 @@
+package org.ntlab.leftoverrecipe.util
+
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import java.io.ByteArrayOutputStream
+
+/**
+ * Created by matsumoto_k on 2017/07/09.
+ */
+class BitmapUtil {
+    companion object {
+
+        fun createImageByteArray(bitmap: Bitmap): ByteArray {
+            val baos = ByteArrayOutputStream()
+            bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos)
+            val imageByteArray = baos.toByteArray()
+            return imageByteArray
+        }
+
+        fun createBitmap(imageByteArray: ByteArray) = BitmapFactory.decodeByteArray(imageByteArray, 0, imageByteArray.size)
+    }
+}
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