diff --git a/McBitFont/Form1.Designer.cs b/McBitFont/Form1.Designer.cs
index 2ec8806..43838bf 100644
--- a/McBitFont/Form1.Designer.cs
+++ b/McBitFont/Form1.Designer.cs
@@ -76,6 +76,7 @@
             this.dlgOpen = new System.Windows.Forms.OpenFileDialog();
             this.btnBaseline = new System.Windows.Forms.Button();
             this.toolTip1 = new System.Windows.Forms.ToolTip(this.components);
+            this.btnClear = new System.Windows.Forms.Button();
             ((System.ComponentModel.ISupportInitialize)(this.nudX)).BeginInit();
             ((System.ComponentModel.ISupportInitialize)(this.nudY)).BeginInit();
             this.panel1.SuspendLayout();
@@ -213,6 +214,7 @@
             // 
             this.panel1.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
             this.panel1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
+            this.panel1.Controls.Add(this.btnClear);
             this.panel1.Controls.Add(this.btnMirrorY);
             this.panel1.Controls.Add(this.btnMirrorX);
             this.panel1.Controls.Add(this.btnInvert);
@@ -676,6 +678,18 @@
             this.toolTip1.InitialDelay = 500;
             this.toolTip1.ReshowDelay = 100;
             // 
+            // btnClear
+            // 
+            this.btnClear.Font = new System.Drawing.Font("Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(204)));
+            this.btnClear.Location = new System.Drawing.Point(7, 8);
+            this.btnClear.Name = "btnClear";
+            this.btnClear.Size = new System.Drawing.Size(30, 30);
+            this.btnClear.TabIndex = 7;
+            this.btnClear.Text = "○";
+            this.toolTip1.SetToolTip(this.btnClear, "Clear canvas");
+            this.btnClear.UseVisualStyleBackColor = true;
+            this.btnClear.Click += new System.EventHandler(this.btnClear_Click);
+            // 
             // MainForm
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
@@ -769,6 +783,7 @@
         private System.Windows.Forms.Button btnBaseline;
         private System.Windows.Forms.ToolStripMenuItem saveToolStripMenuItem;
         private System.Windows.Forms.ToolTip toolTip1;
+        private System.Windows.Forms.Button btnClear;
     }
 }
 
diff --git a/McBitFont/Form1.cs b/McBitFont/Form1.cs
index f6e3901..3c2b151 100644
--- a/McBitFont/Form1.cs
+++ b/McBitFont/Form1.cs
@@ -816,6 +816,12 @@ namespace McBitFont {
             
         }
 
+        private void btnClear_Click(object sender, EventArgs e) {
+            Array.Clear(f.data, 0, f.data.Length);
+            modified = true;
+            dotPanel.Refresh();
+        }
+
         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) {
diff --git a/TODO.txt b/TODO.txt
index 8c64334..4c0d3db 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -9,8 +9,8 @@ Functionality:
 V "Only numbers" range in the New dialog
 V "Specify range" in the New dialog
 V "Single frame", "only numbers" and "specify range" as radio buttons
-- Ability to make monospaced font variable width one
-- Button to Clear/Fill a block
+- Ability to make monospaced font a variable width one
+V Button to Clear/Fill a block
 - Undo/Redo
 - Image import from a file
 - Import from a text array
@@ -19,7 +19,7 @@ V Copy-paste to a symbol with different size
 - Change height of variable width fonts with ability to choose which side to add pixels to
 V Make it possible to have zero width chars in VarWidth fonts
 - "Packed" fonts export
-- Tooltips on main form
+V Tooltips on main form
 
 Bugs:
 V Every char changes its width to default on VarWidth font height change!