diff --git a/GUI/CMakeLists.txt b/GUI/CMakeLists.txt
index 25048a7..26a8076 100644
--- a/GUI/CMakeLists.txt
+++ b/GUI/CMakeLists.txt
@@ -10,6 +10,7 @@ set(gui_SRCS
 	mainwindow.cpp
 	misc.cpp
     extenwindow.cpp
+	setdialog.cpp
 	tests.cpp
 	host/host.cc
 	host/textthread.cc
diff --git a/GUI/host/host.cc b/GUI/host/host.cc
index 27da486..2e20389 100644
--- a/GUI/host/host.cc
+++ b/GUI/host/host.cc
@@ -5,7 +5,6 @@
 #include "host.h"
 #include "const.h"
 #include "defs.h"
-#include "text.h"
 #include "../vnrhook/hijack/texthook.h"
 
 namespace
diff --git a/GUI/host/host.h b/GUI/host/host.h
index 27dd65d..43994e8 100644
--- a/GUI/host/host.h
+++ b/GUI/host/host.h
@@ -6,6 +6,7 @@
 
 #include "common.h"
 #include "textthread.h"
+#include "text.h"
 
 typedef std::function<void(DWORD)> ProcessEventCallback;
 typedef std::function<void(std::shared_ptr<TextThread>)> ThreadEventCallback;
@@ -30,12 +31,19 @@ namespace Host
 	void AddConsoleOutput(std::wstring text);
 }
 
-inline UINT CURRENT_CODEPAGE = SHIFT_JIS;
-inline std::wstring StringToWideString(const std::string& text, UINT encoding = CURRENT_CODEPAGE)
+inline std::wstring StringToWideString(const std::string& text, UINT encoding = CP_UTF8)
 {
 	std::wstring ret(text.size() + 1, 0);
-	ret.resize(MultiByteToWideChar(encoding, 0, text.c_str(), -1, ret.data(), ret.capacity()) - 1);
-	return ret;
+	if (int len = MultiByteToWideChar(encoding, 0, text.c_str(), -1, ret.data(), ret.capacity()))
+	{
+		ret.resize(len - 1);
+		return ret;
+	}
+	else
+	{
+		Host::AddConsoleOutput(INVALID_CODEPAGE);
+		return L"";
+	}
 }
 
 // EOF
diff --git a/GUI/host/textthread.cc b/GUI/host/textthread.cc
index c235134..c095892 100644
--- a/GUI/host/textthread.cc
+++ b/GUI/host/textthread.cc
@@ -37,7 +37,7 @@ void TextThread::Push(const BYTE* data, int len)
 	LOCK(threadMutex);
 	buffer += hp.type & USING_UNICODE
 		? std::wstring((wchar_t*)data, len / 2)
-		: StringToWideString(std::string((char*)data, len), hp.codepage != 0 ? hp.codepage : CURRENT_CODEPAGE);
+		: StringToWideString(std::string((char*)data, len), hp.codepage != 0 ? hp.codepage : defaultCodepage);
 	if (std::all_of(buffer.begin(), buffer.end(), [&](wchar_t c) { return repeatingChars.count(c) > 0; })) buffer.clear();
 	lastPushTime = GetTickCount();
 }
diff --git a/GUI/host/textthread.h b/GUI/host/textthread.h
index 67e18ae..dcfb86d 100644
--- a/GUI/host/textthread.h
+++ b/GUI/host/textthread.h
@@ -16,6 +16,7 @@ public:
 
 	inline static int flushDelay = 400; // flush every 400ms by default
 	inline static int maxBufferSize = 1000;
+	inline static int defaultCodepage = SHIFT_JIS;
 	inline static int threadCounter = 0;
 
 	TextThread(ThreadParam tp, HookParam hp, std::wstring name);
diff --git a/GUI/mainwindow.cpp b/GUI/mainwindow.cpp
index a352158..dcdff4c 100644
--- a/GUI/mainwindow.cpp
+++ b/GUI/mainwindow.cpp
@@ -2,6 +2,7 @@
 #include "ui_mainwindow.h"
 #include "text.h"
 #include "extenwindow.h"
+#include "setdialog.h"
 #include "misc.h"
 #include <QInputDialog>
 
@@ -16,11 +17,10 @@ MainWindow::MainWindow(QWidget *parent) :
 	ttCombo = findChild<QComboBox*>("ttCombo");
 	textOutput = findChild<QPlainTextEdit*>("textOutput");
 
-	if (settings.contains(WINDOW)) this->setGeometry(settings.value(WINDOW).toRect());
-	// TODO: add GUI for changing these
-	if (settings.contains(DEFAULT_CODEPAGE)) CURRENT_CODEPAGE = settings.value(DEFAULT_CODEPAGE).toInt();
+	if (settings.contains(WINDOW)) setGeometry(settings.value(WINDOW).toRect());
 	if (settings.contains(FLUSH_DELAY)) TextThread::flushDelay = settings.value(FLUSH_DELAY).toInt();
 	if (settings.contains(MAX_BUFFER_SIZE)) TextThread::maxBufferSize = settings.value(MAX_BUFFER_SIZE).toInt();
+	if (settings.contains(DEFAULT_CODEPAGE)) TextThread::defaultCodepage = settings.value(DEFAULT_CODEPAGE).toInt();
 
 	qRegisterMetaType<std::shared_ptr<TextThread>>();
 
@@ -42,13 +42,9 @@ MainWindow::MainWindow(QWidget *parent) :
 
 MainWindow::~MainWindow()
 {
-	settings.setValue(WINDOW, this->geometry());
-	settings.setValue(DEFAULT_CODEPAGE, CURRENT_CODEPAGE);
-	settings.setValue(FLUSH_DELAY, TextThread::flushDelay);
-	settings.setValue(MAX_BUFFER_SIZE, TextThread::maxBufferSize);
+	settings.setValue(WINDOW, geometry());
 	settings.sync();
 	delete ui;
-
 	Host::Close();
 }
 
@@ -228,6 +224,11 @@ void MainWindow::on_saveButton_clicked()
 	file.write((hookList + "\r\n").toUtf8());
 }
 
+void MainWindow::on_setButton_clicked()
+{
+	SetDialog(this).exec();
+}
+
 void MainWindow::on_extenButton_clicked()
 {
 	extenWindow->activateWindow();
diff --git a/GUI/mainwindow.h b/GUI/mainwindow.h
index 2b02158..7d60633 100644
--- a/GUI/mainwindow.h
+++ b/GUI/mainwindow.h
@@ -41,6 +41,7 @@ private slots:
 	void on_unhookButton_clicked();
 	void on_hookButton_clicked();
 	void on_saveButton_clicked();
+	void on_setButton_clicked();
 	void on_extenButton_clicked();
 	void on_ttCombo_activated(int index);
 
diff --git a/GUI/mainwindow.ui b/GUI/mainwindow.ui
index 6aee2a2..3fcfbe1 100644
--- a/GUI/mainwindow.ui
+++ b/GUI/mainwindow.ui
@@ -101,6 +101,13 @@
          </property>
         </widget>
        </item>
+       <item>
+        <widget class="QPushButton" name="setButton">
+         <property name="text">
+          <string>Settings</string>
+         </property>
+        </widget>
+       </item>
        <item>
         <widget class="QPushButton" name="extenButton">
          <property name="text">
diff --git a/GUI/qtcommon.h b/GUI/qtcommon.h
index cdc2efe..4aa443b 100644
--- a/GUI/qtcommon.h
+++ b/GUI/qtcommon.h
@@ -5,5 +5,6 @@
 #include <QVector>
 #include <QHash>
 #include <QMainWindow>
+#include <QDialog>
 #include <QFile>
 #include <QRegularExpression>
diff --git a/GUI/setdialog.cpp b/GUI/setdialog.cpp
new file mode 100644
index 0000000..d86ae14
--- /dev/null
+++ b/GUI/setdialog.cpp
@@ -0,0 +1,40 @@
+#include "setdialog.h"
+#include "ui_setdialog.h"
+#include "defs.h"
+#include "host/host.h"
+#include <QSettings>
+
+SetDialog::SetDialog(QWidget* parent) :
+	QDialog(parent, Qt::WindowCloseButtonHint),
+	ui(new Ui::SetDialog)
+{
+	ui->setupUi(this);
+
+	QFormLayout* layout = findChild<QFormLayout*>("layout");
+
+	auto addSpinBox = [&](QString label, int value)
+	{
+		auto spinbox = new QSpinBox(this);
+		spinbox->setMaximum(INT_MAX);
+		spinbox->setValue(value);
+		layout->insertRow(0, label, spinbox);
+		return spinbox;
+	};
+	flushDelay = addSpinBox(FLUSH_DELAY, TextThread::flushDelay);
+	maxBufferSize = addSpinBox(MAX_BUFFER_SIZE, TextThread::maxBufferSize);
+	defaultCodepage = addSpinBox(DEFAULT_CODEPAGE, TextThread::defaultCodepage);
+}
+
+SetDialog::~SetDialog()
+{
+	delete ui;
+}
+
+void SetDialog::on_buttonBox_accepted()
+{
+	QSettings settings(CONFIG_FILE, QSettings::IniFormat);
+	settings.setValue(FLUSH_DELAY, TextThread::flushDelay = flushDelay->value());
+	settings.setValue(MAX_BUFFER_SIZE, TextThread::maxBufferSize = maxBufferSize->value());
+	settings.setValue(DEFAULT_CODEPAGE, TextThread::defaultCodepage = defaultCodepage->value());
+	settings.sync();
+}
\ No newline at end of file
diff --git a/GUI/setdialog.h b/GUI/setdialog.h
new file mode 100644
index 0000000..ae7937c
--- /dev/null
+++ b/GUI/setdialog.h
@@ -0,0 +1,30 @@
+#ifndef SETDIALOG_H
+#define SETDIALOG_H
+
+#include "qtcommon.h"
+#include <QSpinBox>
+
+namespace Ui
+{
+	class SetDialog;
+}
+
+class SetDialog : public QDialog
+{
+	Q_OBJECT
+
+public:
+	explicit SetDialog(QWidget* parent = nullptr);
+	~SetDialog();
+
+private slots:
+	void on_buttonBox_accepted();
+
+private:
+	Ui::SetDialog* ui;
+	QSpinBox* flushDelay;
+	QSpinBox* maxBufferSize;
+	QSpinBox* defaultCodepage;
+};
+
+#endif // SETDIALOG_H
diff --git a/GUI/setdialog.ui b/GUI/setdialog.ui
new file mode 100644
index 0000000..f7cd03f
--- /dev/null
+++ b/GUI/setdialog.ui
@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>SetDialog</class>
+ <widget class="QDialog" name="SetDialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>300</width>
+    <height>120</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Settings</string>
+  </property>
+  <layout class="QFormLayout" name="layout">
+   <item row="0" column="1">
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>SetDialog</receiver>
+   <slot>accept()</slot>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>SetDialog</receiver>
+   <slot>reject()</slot>
+  </connection>
+ </connections>
+</ui>
diff --git a/include/defs.h b/include/defs.h
index 193d9c2..fe34324 100644
--- a/include/defs.h
+++ b/include/defs.h
@@ -27,8 +27,8 @@ constexpr auto EXTEN_SAVE_FILE = u8"Extensions.txt";
 // Settings
 
 constexpr auto WINDOW = u8"Window";
-constexpr auto DEFAULT_CODEPAGE = u8"Default_Codepage";
-constexpr auto FLUSH_DELAY = u8"Flush_Delay";
-constexpr auto MAX_BUFFER_SIZE = u8"Max_Buffer_Size";
+constexpr auto DEFAULT_CODEPAGE = u8"Default Codepage";
+constexpr auto FLUSH_DELAY = u8"Flush Delay";
+constexpr auto MAX_BUFFER_SIZE = u8"Max Buffer Size";
 
 // EOF
diff --git a/include/text.h b/include/text.h
index ef4f00d..ac9afe1 100644
--- a/include/text.h
+++ b/include/text.h
@@ -28,3 +28,4 @@ constexpr auto ARCHITECTURE_MISMATCH = L"Textractor: ERROR: architecture mismatc
 constexpr auto INJECT_FAILED = L"Textractor: ERROR: couldn't inject";
 constexpr auto INVALID_CODE = L"Textractor: invalid code";
 constexpr auto NO_HOOKS = L"Textractor: no hooks detected";
+constexpr auto INVALID_CODEPAGE = L"Textractor: ERROR: couldn't convert text (invalid codepage?)";