diff --git a/contrast-finder-utils/src/main/java/org/asqatasun/utils/colorconvertor/ColorConverter.java b/contrast-finder-utils/src/main/java/org/asqatasun/utils/colorconvertor/ColorConverter.java
index c3af4b33..ef207b2f 100644
--- a/contrast-finder-utils/src/main/java/org/asqatasun/utils/colorconvertor/ColorConverter.java
+++ b/contrast-finder-utils/src/main/java/org/asqatasun/utils/colorconvertor/ColorConverter.java
@@ -38,7 +38,8 @@ public final class ColorConverter {
     private static final int RGB_SHORT_HEXA_LENGTH = 3;
     private static final int CONVERT_TO_BASE_16 = 16;
     private static final int MAX_ANGLE = 360;
-    private static final String HEXADECIMAL_DICTIONNARY = "[0-9A-Fa-f]+";
+    private static final String HEXADECIMAL_DICTIONNARY    = "[0-9A-Fa-f]+";   //  FFF,  FFFFFF
+    private static final String HEXADECIMAL_DICTIONNARY_V2 = "#?[0-9A-Fa-f]+"; // #FFF, #FFFFFF
 
     /**
      * Private constructor, utility class
@@ -120,10 +121,15 @@ public static Color offsetRgbColor(Color bgColor, int offsetRed, int offsetGreen
      */
     public static String formatColorStr(String colorStr) {
         colorStr = colorStr.replaceAll("\\s", ""); // replace ' ', \t, \n, ...
-        if (colorStr.charAt(0) != '#') {
-            colorStr = "#" + colorStr;
+        if(colorStr.matches(HEXADECIMAL_DICTIONNARY_V2)) {
+            if (colorStr.charAt(0) != '#') {
+                colorStr = "#" + colorStr;
+            }
+            colorStr = colorStr.toUpperCase();
+        }
+        else {
+            colorStr = colorStr.toLowerCase();
         }
-        colorStr  = colorStr.toUpperCase();
         return colorStr;
     }
 
diff --git a/contrast-finder-utils/src/test/java/org/asqatasun/utils/colorconvertor/ColorConverterTest.java b/contrast-finder-utils/src/test/java/org/asqatasun/utils/colorconvertor/ColorConverterTest.java
index 2fa13ae3..79f5e20a 100644
--- a/contrast-finder-utils/src/test/java/org/asqatasun/utils/colorconvertor/ColorConverterTest.java
+++ b/contrast-finder-utils/src/test/java/org/asqatasun/utils/colorconvertor/ColorConverterTest.java
@@ -142,6 +142,23 @@ public void testGetHue() {
 
 // formatColor()
 /////////////////////////////////////////////////////////////////////
+    public void testFormatColorNotValidHex2() {
+        System.out.println("formatColorNotValidHex2 [#ZZZ]");
+        String colorStr  = "#ZZZ"; // # must be added
+        String expResult = "#zzz";
+        String result    = ColorConverter.formatColorStr(colorStr);
+        assertEquals(expResult, result);
+    }
+
+    public void testFormatColorNotValidHex() {
+        System.out.println("formatColorNotValidHex [ZZZ]");
+        String colorStr  = "ZZZ"; // # must be added
+        String expResult = "zzz";
+        String result    = ColorConverter.formatColorStr(colorStr);
+        assertEquals(expResult, result);
+    }
+
+
     public void testFormatColorHexAddHash() {
         System.out.println("formatColorHexAddHash [000000]");
         String colorStr  = "000000"; // # must be added