diff --git a/src/me/ByteEdit/main/Main.java b/src/me/ByteEdit/main/Main.java
index fd7a7cf..f7c8622 100644
--- a/src/me/ByteEdit/main/Main.java
+++ b/src/me/ByteEdit/main/Main.java
@@ -6,6 +6,7 @@ import java.awt.EventQueue;
 import java.awt.Font;
 import java.awt.GridLayout;
 import java.awt.HeadlessException;
+import java.awt.Toolkit;
 import java.awt.datatransfer.DataFlavor;
 import java.awt.datatransfer.Transferable;
 import java.awt.dnd.DropTarget;
@@ -77,6 +78,7 @@ public class Main extends JFrame {
 
 	public static RSyntaxTextArea textArea;
 	public static SearchBox searchBox;
+	public static OptionBox optionBox;
 
 	public static JTree tree;
 
@@ -145,9 +147,11 @@ public class Main extends JFrame {
 	public Main() {
 		INSTANCE = this;
 		searchBox = new SearchBox();
+		optionBox = new OptionBox();
 		setTitle("ByteEdit");
 		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
-		setBounds(100, 100, 813, 474);
+		setBounds((int) (Toolkit.getDefaultToolkit().getScreenSize().getWidth() / 2 - 407),
+				(int) (Toolkit.getDefaultToolkit().getScreenSize().getHeight() / 2 - 237), 814, 474);
 		try {
 			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
 		} catch (Exception e) {
@@ -225,6 +229,13 @@ public class Main extends JFrame {
 				}
 			}
 		}, ctrlS, JComponent.WHEN_FOCUSED);
+		KeyStroke ctrlO = KeyStroke.getKeyStroke(KeyEvent.VK_O, KeyEvent.CTRL_DOWN_MASK);
+		textArea.registerKeyboardAction(new ActionListener() {
+			@Override
+			public void actionPerformed(ActionEvent e) {
+				optionBox.setVisible(true);
+			}
+		}, ctrlO, JComponent.WHEN_IN_FOCUSED_WINDOW);
 		textArea.setEditable(true);
 		textArea.setSyntaxEditingStyle(SyntaxConstants.SYNTAX_STYLE_JAVA_DISASSEMBLE);
 		textArea.setCodeFoldingEnabled(true);
@@ -417,8 +428,15 @@ public class Main extends JFrame {
 				output.write(entry.getValue());
 				output.closeEntry();
 			}
+			int computeFlags = 0;
+			if (optionBox.chckbxComputeFrames.isSelected()) {
+				computeFlags |= ClassWriter.COMPUTE_FRAMES;
+			}
+			if (optionBox.chckbxComputeMax.isSelected()) {
+				computeFlags |= ClassWriter.COMPUTE_MAXS;
+			}
 			for (ClassNode element : classes) {
-				ClassWriter writer = new ClassWriter(0);
+				ClassWriter writer = new ClassWriter(computeFlags);
 				element.accept(writer);
 				output.putNextEntry(new JarEntry(element.name.replaceAll("\\.", "/") + ".class"));
 				output.write(writer.toByteArray());
diff --git a/src/me/ByteEdit/main/OptionBox.java b/src/me/ByteEdit/main/OptionBox.java
new file mode 100644
index 0000000..c7095dd
--- /dev/null
+++ b/src/me/ByteEdit/main/OptionBox.java
@@ -0,0 +1,63 @@
+package me.ByteEdit.main;
+
+import java.awt.BorderLayout;
+import java.awt.EventQueue;
+import java.awt.Toolkit;
+
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import javax.swing.UIManager;
+import javax.swing.border.EmptyBorder;
+import javax.swing.JLabel;
+import javax.swing.JCheckBox;
+
+public class OptionBox extends JFrame {
+
+	private JPanel contentPane;
+	public JCheckBox chckbxComputeFrames;
+	public JCheckBox chckbxComputeMax;
+
+	/**
+	 * Launch the application.
+	 */
+	public static void main(String[] args) {
+		EventQueue.invokeLater(new Runnable() {
+			public void run() {
+				try {
+					OptionBox frame = new OptionBox();
+					frame.setVisible(true);
+				} catch (Exception e) {
+					e.printStackTrace();
+				}
+			}
+		});
+	}
+
+	/**
+	 * Create the frame.
+	 */
+	public OptionBox() {
+		try {
+			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+		setResizable(false);
+		setTitle("Options");
+		setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
+		setBounds((int) (Toolkit.getDefaultToolkit().getScreenSize().getWidth() / 2 - 150),
+				(int) (Toolkit.getDefaultToolkit().getScreenSize().getHeight() / 2 - 100), 300, 200);
+		contentPane = new JPanel();
+		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
+		setContentPane(contentPane);
+		contentPane.setLayout(null);
+		
+		chckbxComputeFrames = new JCheckBox("Compute Frames");
+		chckbxComputeFrames.setBounds(6, 7, 138, 23);
+		contentPane.add(chckbxComputeFrames);
+		
+		chckbxComputeMax = new JCheckBox("Compute Max");
+		chckbxComputeMax.setBounds(6, 33, 138, 23);
+		contentPane.add(chckbxComputeMax);
+	}
+}
diff --git a/src/me/ByteEdit/main/SearchBox.java b/src/me/ByteEdit/main/SearchBox.java
index ac26920..df5aa29 100644
--- a/src/me/ByteEdit/main/SearchBox.java
+++ b/src/me/ByteEdit/main/SearchBox.java
@@ -1,5 +1,6 @@
 package me.ByteEdit.main;
 
+import java.awt.Toolkit;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.awt.event.KeyEvent;
@@ -35,7 +36,8 @@ public class SearchBox extends JFrame {
 		setResizable(false);
 		setTitle("Find/Replace");
 		setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
-		setBounds(100, 100, 256, 263);
+		setBounds((int) (Toolkit.getDefaultToolkit().getScreenSize().getWidth() / 2 - 128),
+				(int) (Toolkit.getDefaultToolkit().getScreenSize().getHeight() / 2 - 181), 256, 262);
 		contentPane = new JPanel();
 		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
 		setContentPane(contentPane);