diff --git a/McBitFont/Form1.Designer.cs b/McBitFont/Form1.Designer.cs
index 5498b4a..7cf13db 100644
--- a/McBitFont/Form1.Designer.cs
+++ b/McBitFont/Form1.Designer.cs
@@ -34,6 +34,7 @@
             cbZoom = new System.Windows.Forms.ComboBox();
             label4 = new System.Windows.Forms.Label();
             panel1 = new System.Windows.Forms.Panel();
+            btnFill = new System.Windows.Forms.Button();
             btnClear = new System.Windows.Forms.Button();
             btnMirrorY = new System.Windows.Forms.Button();
             btnMirrorX = new System.Windows.Forms.Button();
@@ -96,8 +97,9 @@
             toolTip1 = new System.Windows.Forms.ToolTip(components);
             chkLeftSide = new System.Windows.Forms.CheckBox();
             chkTopSide = new System.Windows.Forms.CheckBox();
-            label3 = new System.Windows.Forms.Label();
             chkHexCodes = new System.Windows.Forms.CheckBox();
+            label3 = new System.Windows.Forms.Label();
+            FillToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
             ((System.ComponentModel.ISupportInitialize)nudX).BeginInit();
             ((System.ComponentModel.ISupportInitialize)nudY).BeginInit();
             panel1.SuspendLayout();
@@ -209,6 +211,7 @@
             // 
             panel1.Anchor = System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right;
             panel1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
+            panel1.Controls.Add(btnFill);
             panel1.Controls.Add(btnClear);
             panel1.Controls.Add(btnMirrorY);
             panel1.Controls.Add(btnMirrorX);
@@ -223,6 +226,19 @@
             panel1.Size = new System.Drawing.Size(140, 139);
             panel1.TabIndex = 9;
             // 
+            // btnFill
+            // 
+            btnFill.Font = new System.Drawing.Font("Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, 204);
+            btnFill.Location = new System.Drawing.Point(92, 9);
+            btnFill.Margin = new System.Windows.Forms.Padding(4, 3, 4, 3);
+            btnFill.Name = "btnFill";
+            btnFill.Size = new System.Drawing.Size(35, 35);
+            btnFill.TabIndex = 8;
+            btnFill.Text = "⬤";
+            toolTip1.SetToolTip(btnFill, "Paint canvas black");
+            btnFill.UseVisualStyleBackColor = true;
+            btnFill.Click += btnFill_Click;
+            // 
             // btnClear
             // 
             btnClear.Font = new System.Drawing.Font("Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, 204);
@@ -232,7 +248,7 @@
             btnClear.Size = new System.Drawing.Size(35, 35);
             btnClear.TabIndex = 7;
             btnClear.Text = "○";
-            toolTip1.SetToolTip(btnClear, "Clear canvas");
+            toolTip1.SetToolTip(btnClear, "Paint canvas white");
             btnClear.UseVisualStyleBackColor = true;
             btnClear.Click += btnClear_Click;
             // 
@@ -713,14 +729,14 @@
             // 
             // canvasToolStripMenuItem
             // 
-            canvasToolStripMenuItem.DropDownItems.AddRange(new System.Windows.Forms.ToolStripItem[] { ClearToolStripMenuItem, shiftUpToolStripMenuItem, shiftDownToolStripMenuItem, shiftLeftToolStripMenuItem, shiftRightToolStripMenuItem, invertToolStripMenuItem, mirrorXToolStripMenuItem, mirrorYToolStripMenuItem, applyToolStripMenuItem });
+            canvasToolStripMenuItem.DropDownItems.AddRange(new System.Windows.Forms.ToolStripItem[] { ClearToolStripMenuItem, FillToolStripMenuItem, shiftUpToolStripMenuItem, shiftDownToolStripMenuItem, shiftLeftToolStripMenuItem, shiftRightToolStripMenuItem, invertToolStripMenuItem, mirrorXToolStripMenuItem, mirrorYToolStripMenuItem, applyToolStripMenuItem });
             canvasToolStripMenuItem.Name = "canvasToolStripMenuItem";
             canvasToolStripMenuItem.Size = new System.Drawing.Size(57, 20);
             canvasToolStripMenuItem.Text = "Canvas";
             // 
             // ClearToolStripMenuItem
             // 
-            ClearToolStripMenuItem.Image = Properties.Resources.z_shading;
+            ClearToolStripMenuItem.Image = Properties.Resources.Canvas_Clear;
             ClearToolStripMenuItem.Name = "ClearToolStripMenuItem";
             ClearToolStripMenuItem.ShortcutKeyDisplayString = "";
             ClearToolStripMenuItem.ShortcutKeys = System.Windows.Forms.Keys.Control | System.Windows.Forms.Keys.W;
@@ -877,6 +893,18 @@
             toolTip1.SetToolTip(chkTopSide, "Height changes will be made on Top/Bottom side");
             chkTopSide.UseVisualStyleBackColor = true;
             // 
+            // chkHexCodes
+            // 
+            chkHexCodes.AutoSize = true;
+            chkHexCodes.Location = new System.Drawing.Point(618, 155);
+            chkHexCodes.Name = "chkHexCodes";
+            chkHexCodes.Size = new System.Drawing.Size(95, 19);
+            chkHexCodes.TabIndex = 22;
+            chkHexCodes.Text = "Codes in Hex";
+            toolTip1.SetToolTip(chkHexCodes, "Option to show symbol codes in Hexadecimal");
+            chkHexCodes.UseVisualStyleBackColor = true;
+            chkHexCodes.CheckedChanged += chkHexCodes_CheckedChanged;
+            // 
             // label3
             // 
             label3.Anchor = System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right;
@@ -887,16 +915,14 @@
             label3.TabIndex = 21;
             label3.Text = "Cursor:";
             // 
-            // chkHexCodes
+            // FillToolStripMenuItem
             // 
-            chkHexCodes.AutoSize = true;
-            chkHexCodes.Location = new System.Drawing.Point(618, 155);
-            chkHexCodes.Name = "chkHexCodes";
-            chkHexCodes.Size = new System.Drawing.Size(95, 19);
-            chkHexCodes.TabIndex = 22;
-            chkHexCodes.Text = "Codes in Hex";
-            chkHexCodes.UseVisualStyleBackColor = true;
-            chkHexCodes.CheckedChanged += chkHexCodes_CheckedChanged;
+            FillToolStripMenuItem.Image = Properties.Resources.Canvas_Fill;
+            FillToolStripMenuItem.Name = "FillToolStripMenuItem";
+            FillToolStripMenuItem.ShortcutKeys = System.Windows.Forms.Keys.Control | System.Windows.Forms.Keys.B;
+            FillToolStripMenuItem.Size = new System.Drawing.Size(197, 22);
+            FillToolStripMenuItem.Text = "Fill canvas";
+            FillToolStripMenuItem.Click += btnFill_Click;
             // 
             // MainForm
             // 
@@ -1019,6 +1045,8 @@
         private System.Windows.Forms.ToolStripMenuItem importImageToolStripMenuItem;
         private System.Windows.Forms.Label label3;
         private System.Windows.Forms.CheckBox chkHexCodes;
+        private System.Windows.Forms.Button btnFill;
+        private System.Windows.Forms.ToolStripMenuItem FillToolStripMenuItem;
     }
 }
 
diff --git a/McBitFont/Form1.cs b/McBitFont/Form1.cs
index 598af25..b2bfc54 100644
--- a/McBitFont/Form1.cs
+++ b/McBitFont/Form1.cs
@@ -125,7 +125,7 @@ namespace McBitFont {
             return ff;
         }
 
-        public void ListViewItem_SetSpacing(ListView listview, short leftPadding, short topPadding) {
+        public static void ListViewItem_SetSpacing(ListView listview, short leftPadding, short topPadding) {
             const int LVM_FIRST = 0x1000;
             const int LVM_SETICONSPACING = LVM_FIRST + 53;
             SendMessage(listview.Handle, LVM_SETICONSPACING, IntPtr.Zero, (IntPtr)MakeLong(leftPadding, topPadding));
@@ -161,8 +161,8 @@ namespace McBitFont {
             if (monospaced) {
                 Bitmap bmp;
                 for (int i = 0; i < frames.Count; i++) {
-                    frames[i] = frameResize(frames[i], (int)nudX.Value, dotHeight);
-                    bmp = getMiniPictue(frames[i]);
+                    frames[i] = FrameResize(frames[i], (int)nudX.Value, dotHeight);
+                    bmp = GetMiniPictue(frames[i]);
                     string s = frames[i].code.ToString().PadLeft(3, '0');
                     ilMiniatures.Images.RemoveByKey(s);
                     ilMiniatures.Images.Add(s, (Image)bmp);
@@ -174,7 +174,7 @@ namespace McBitFont {
                 prjModified = true;
             }
 
-            dotResize((int)nudX.Value, dotHeight);
+            DotResize((int)nudX.Value, dotHeight);
             Cursor.Current = Cursors.Default;
         }
 
@@ -182,8 +182,8 @@ namespace McBitFont {
             Cursor.Current = Cursors.WaitCursor;
             Bitmap bmp;
             for (int i = 0; i < frames.Count; i++) {
-                frames[i] = frameResize(frames[i], frames[i].width, (int)nudY.Value);
-                bmp = getMiniPictue(frames[i]);
+                frames[i] = FrameResize(frames[i], frames[i].width, (int)nudY.Value);
+                bmp = GetMiniPictue(frames[i]);
                 string s = frames[i].code.ToString().PadLeft(3, '0');
                 ilMiniatures.Images.RemoveByKey(s);
                 ilMiniatures.Images.Add(s, (Image)bmp);
@@ -194,11 +194,11 @@ namespace McBitFont {
                 prjModified = true;
             }
 
-            dotResize(dotWidth, (int)nudY.Value);
+            DotResize(dotWidth, (int)nudY.Value);
             Cursor.Current = Cursors.Default;
         }
 
-        private FrameMiniature frameResize(FrameMiniature ff, int neww, int newh) {
+        private FrameMiniature FrameResize(FrameMiniature ff, int neww, int newh) {
             int oldw = ff.width;
             int oldh = ff.height;
             int di = 0, dj = 0;
@@ -226,8 +226,8 @@ namespace McBitFont {
             return ff;
         }
 
-        private void dotResize(int ww, int hh) {
-            f = frameResize(f, ww, hh);
+        private void DotResize(int ww, int hh) {
+            f = FrameResize(f, ww, hh);
             dotWidth = ww;
             dotHeight = hh;
             w = pixelOffset + dotWidth * (cellSize + gap);
@@ -496,7 +496,7 @@ namespace McBitFont {
             int index = frames.FindIndex(x => x.code == f.code);
             frames[index] = f;
 
-            var sizedBMP = getMiniPictue(f);
+            var sizedBMP = GetMiniPictue(f);
             string s = f.code.ToString().PadLeft(3, '0');
             ilMiniatures.Images.RemoveByKey(s);
             ilMiniatures.Images.Add(s, (Image)sizedBMP);
@@ -505,7 +505,7 @@ namespace McBitFont {
             prjModified = true;
         }
 
-        private Bitmap getMiniPictue(FrameMiniature m) {
+        private static Bitmap GetMiniPictue(FrameMiniature m) {
             int picSize = (m.width > m.height) ? m.width : m.height;
             var bmp = new Bitmap(picSize, picSize);
             int imin = m.width < picSize ? (picSize - m.width) / 2 : 0;
@@ -572,7 +572,7 @@ namespace McBitFont {
             return enc.GetString(new byte[] { (byte)code });
         }
 
-        private FrameMiniature fillFrame(FrameMiniature ff, Font font, int sx, int sy) {
+        private FrameMiniature DrawFrameChar(FrameMiniature ff, Font font, int sx, int sy) {
             string s = decodeSymbol(ff.code);
             Bitmap bmp = new Bitmap(ff.width, ff.height);
             Graphics g = Graphics.FromImage(bmp);
@@ -640,7 +640,7 @@ namespace McBitFont {
 
                     for (i = imin; i <= imax; i++) {
                         newf = new FrameMiniature(i, neww, newh);
-                        if (form.cbFontBased.Checked) newf = fillFrame(newf, form.dlgFont.Font, (int)form.nudShiftX.Value, (int)form.nudShiftY.Value);
+                        if (form.cbFontBased.Checked) newf = DrawFrameChar(newf, form.dlgFont.Font, (int)form.nudShiftX.Value, (int)form.nudShiftY.Value);
                         frames.Add(newf);
                     }
 
@@ -654,7 +654,7 @@ namespace McBitFont {
                 codepage = (form.cbEncoding.SelectedItem as New.EncodingItem).Code;
                 foreach (FrameMiniature ff in frames) {
                     var s = ff.code.ToString().PadLeft(3, '0');
-                    ilMiniatures.Images.Add(s, (Image)getMiniPictue(ff));
+                    ilMiniatures.Images.Add(s, (Image)GetMiniPictue(ff));
                     var sss = decodeSymbol(ff.code);
                     miniList.Items.Add(s, s + ' ' + append + sss, s);
                 }
@@ -764,14 +764,14 @@ namespace McBitFont {
                 var s = ff.code.ToString().PadLeft(3, '0');
                 var sHex = 'x' + Convert.ToString(ff.code, 16).PadLeft(2, '0').ToUpper();
                 var sss = decodeSymbol(ff.code);
-                ilMiniatures.Images.Add(s, (Image)getMiniPictue(ff));
+                ilMiniatures.Images.Add(s, (Image)GetMiniPictue(ff));
                 miniList.Items.Add(s, (chkHexCodes.Checked ? sHex : s) + ' ' + sss, s);
             }
             nudX.ValueChanged -= nudX_ValueChanged;
             nudY.ValueChanged -= nudY_ValueChanged;
             nudX.Value = frames.First().width;
             nudY.Value = frames.First().height;
-            dotResize((int)nudX.Value, (int)nudY.Value);
+            DotResize((int)nudX.Value, (int)nudY.Value);
             nudX.ValueChanged += nudX_ValueChanged;
             nudY.ValueChanged += nudY_ValueChanged;
             f = CopyFrame(frames.First());
@@ -856,7 +856,7 @@ namespace McBitFont {
             }
 
             var s = ff.code.ToString().PadLeft(3, '0');
-            ilMiniatures.Images.Add(s, (Image)getMiniPictue(ff));
+            ilMiniatures.Images.Add(s, (Image)GetMiniPictue(ff));
             var sss = decodeSymbol(ff.code);
             miniList.Items.Add(s, s + ' ' + sss, s);
             CheckForAdd();
@@ -939,15 +939,32 @@ namespace McBitFont {
 
         }
 
-        private void btnClear_Click(object sender, EventArgs e) {
+        private void FillFrame(bool val) {
             history.AddPre(f);
-            Array.Clear(f.data, 0, f.data.Length);
+
+            if (!val) Array.Clear(f.data);
+            else
+                for (int i = 0; i < f.width; i++) {
+                    for (int j = 0; j < f.height; j++) {
+                        f.data[i, j] = val;
+                    }
+                }
+
             history.AddPost(f);
             CheckHistoryButtons();
             modified = true;
+            prjModified = true;
             dotPanel.Refresh();
         }
 
+        private void btnClear_Click(object sender, EventArgs e) {
+            FillFrame(false);
+        }
+
+        private void btnFill_Click(object sender, EventArgs e) {
+            FillFrame(true);
+        }
+
         private void MainForm_FormClosing(object sender, FormClosingEventArgs e) {
             if (prjModified) {
                 if (MessageBox.Show("The project is modified.\nAre you sure you want to quit?", "Are you sure?", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No) {
@@ -1050,7 +1067,7 @@ namespace McBitFont {
 
                     var key = ff.code.ToString().PadLeft(3, '0');
                     var text = decodeSymbol(ff.code);
-                    ilMiniatures.Images.Add(key, (Image)getMiniPictue(ff));
+                    ilMiniatures.Images.Add(key, (Image)GetMiniPictue(ff));
                     miniList.Items.Add(key, key + ' ' + text, key);
                 }
 
@@ -1095,8 +1112,9 @@ namespace McBitFont {
                 } else {
                     item.Text = item.ImageKey + ' ' + symbol;
                 }
-                
+
             }
         }
+
     }
 }
diff --git a/McBitFont/Properties/Resources.Designer.cs b/McBitFont/Properties/Resources.Designer.cs
index 2d26efd..281bcaa 100644
--- a/McBitFont/Properties/Resources.Designer.cs
+++ b/McBitFont/Properties/Resources.Designer.cs
@@ -110,6 +110,26 @@ namespace McBitFont.Properties {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized resource of type System.Drawing.Bitmap.
+        /// </summary>
+        internal static System.Drawing.Bitmap Canvas_Clear {
+            get {
+                object obj = ResourceManager.GetObject("Canvas_Clear", resourceCulture);
+                return ((System.Drawing.Bitmap)(obj));
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized resource of type System.Drawing.Bitmap.
+        /// </summary>
+        internal static System.Drawing.Bitmap Canvas_Fill {
+            get {
+                object obj = ResourceManager.GetObject("Canvas_Fill", resourceCulture);
+                return ((System.Drawing.Bitmap)(obj));
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized resource of type System.Drawing.Bitmap.
         /// </summary>
diff --git a/McBitFont/Properties/Resources.resx b/McBitFont/Properties/Resources.resx
index e7614bc..cabd1c6 100644
--- a/McBitFont/Properties/Resources.resx
+++ b/McBitFont/Properties/Resources.resx
@@ -151,8 +151,8 @@
   <data name="z_right" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Resources\arrow_right.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
-  <data name="Famfamfam-Silk-Door-out.16" type="System.Resources.ResXFileRef, System.Windows.Forms">
-    <value>..\Resources\Famfamfam-Silk-Door-out.16.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
+  <data name="calculator" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\Resources\calculator.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
   <data name="z_asterisk" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Resources\asterisk_orange.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
@@ -160,9 +160,15 @@
   <data name="z_down" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\..\icons\famfamfam\arrow_down.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
+  <data name="Canvas_Clear" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\Resources\Canvas_Clear.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
+  </data>
   <data name="z_uo" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Resources\arrow_up.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
+  <data name="Famfamfam-Silk-Door-out.16" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\Resources\Famfamfam-Silk-Door-out.16.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
+  </data>
   <data name="file" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Resources\file.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
@@ -208,7 +214,7 @@
   <data name="icon_64" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Resources\icon_64.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
-  <data name="calculator" type="System.Resources.ResXFileRef, System.Windows.Forms">
-    <value>..\Resources\calculator.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
+  <data name="Canvas_Fill" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\Resources\Canvas_Fill.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
 </root>
\ No newline at end of file
diff --git a/McBitFont/Resources/Canvas_Clear.png b/McBitFont/Resources/Canvas_Clear.png
new file mode 100644
index 0000000..ead2bd1
Binary files /dev/null and b/McBitFont/Resources/Canvas_Clear.png differ
diff --git a/McBitFont/Resources/Canvas_Fill.png b/McBitFont/Resources/Canvas_Fill.png
new file mode 100644
index 0000000..ddc5cd0
Binary files /dev/null and b/McBitFont/Resources/Canvas_Fill.png differ
diff --git a/TODO.txt b/TODO.txt
index 1e4f44c..6c5cf0e 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -9,6 +9,7 @@ V Option to display codes in Hex numbers
 V Make symbol list wider to display 8 characters instead of 7
 
 Functionality:
+V Fill canvas button
 V Context menu in symbol navigator
 V Delete symbols before/after selected
 V Shift all symbols on code line (change symbol codes)
diff --git a/icons/Canvas_Clear.png b/icons/Canvas_Clear.png
new file mode 100644
index 0000000..ead2bd1
Binary files /dev/null and b/icons/Canvas_Clear.png differ
diff --git a/icons/Canvas_Fill.png b/icons/Canvas_Fill.png
new file mode 100644
index 0000000..ddc5cd0
Binary files /dev/null and b/icons/Canvas_Fill.png differ