diff --git a/QtGameMaker.pro b/QtGameMaker.pro
index 2ee6515..aafece6 100644
--- a/QtGameMaker.pro
+++ b/QtGameMaker.pro
@@ -32,6 +32,7 @@ HEADERS += \
     src/editor/dialogs/actions/movetowardsdialog.h \
     src/editor/dialogs/actions/executecodedialog.h \
     src/editor/dialogs/actions/speedverticaldialog.h \
+    src/editor/dialogs/changeimagesizedialog.h \
     src/editor/dialogs/genericcodeeditordialog.h \
     src/editor/dialogs/includedfilepropertiesdialog.h \
     src/editor/dialogs/transparentbackgroundsettingsdialog.h \
@@ -109,6 +110,7 @@ SOURCES += \
     src/editor/dialogs/actions/movefreedialog.cpp \
     src/editor/dialogs/actions/movetowardsdialog.cpp \
     src/editor/dialogs/actions/speedverticaldialog.cpp \
+    src/editor/dialogs/changeimagesizedialog.cpp \
     src/editor/dialogs/genericcodeeditordialog.cpp \
     src/editor/dialogs/includedfilepropertiesdialog.cpp \
     src/editor/dialogs/transparentbackgroundsettingsdialog.cpp \
@@ -183,6 +185,7 @@ FORMS += \
     src/editor/dialogs/actions/movefreedialog.ui \
     src/editor/dialogs/actions/movetowardsdialog.ui \
     src/editor/dialogs/actions/speedverticaldialog.ui \
+    src/editor/dialogs/changeimagesizedialog.ui \
     src/editor/dialogs/includedfilepropertiesdialog.ui \
     src/editor/dialogs/transparentbackgroundsettingsdialog.ui \
     src/editor/mainwindow.ui \
diff --git a/src/editor/dialogs/changeimagesizedialog.cpp b/src/editor/dialogs/changeimagesizedialog.cpp
new file mode 100644
index 0000000..465d500
--- /dev/null
+++ b/src/editor/dialogs/changeimagesizedialog.cpp
@@ -0,0 +1,20 @@
+#include "changeimagesizedialog.h"
+#include "ui_changeimagesizedialog.h"
+
+#include "editorguiutils.h"
+
+ChangeImageSizeDialog::ChangeImageSizeDialog(QWidget *parent) :
+    QDialog{parent},
+    m_ui{std::make_unique<Ui::ChangeImageSizeDialog>()}
+{
+    m_ui->setupUi(this);
+
+#ifdef Q_OS_LINUX
+    setWindowFlags((windowFlags() & ~Qt::Dialog) | Qt::Window);
+#endif
+    setWindowFlag(Qt::WindowCloseButtonHint);
+
+    improveButtonBox(m_ui->buttonBox);
+}
+
+ChangeImageSizeDialog::~ChangeImageSizeDialog() = default;
diff --git a/src/editor/dialogs/changeimagesizedialog.h b/src/editor/dialogs/changeimagesizedialog.h
new file mode 100644
index 0000000..44728c9
--- /dev/null
+++ b/src/editor/dialogs/changeimagesizedialog.h
@@ -0,0 +1,18 @@
+#pragma once
+
+#include <QDialog>
+#include <memory>
+
+namespace Ui { class ChangeImageSizeDialog; }
+
+class ChangeImageSizeDialog : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit ChangeImageSizeDialog(QWidget *parent = nullptr);
+    ~ChangeImageSizeDialog() override;
+
+private:
+    const std::unique_ptr<Ui::ChangeImageSizeDialog> m_ui;
+};
diff --git a/src/editor/dialogs/changeimagesizedialog.ui b/src/editor/dialogs/changeimagesizedialog.ui
new file mode 100644
index 0000000..34bdff5
--- /dev/null
+++ b/src/editor/dialogs/changeimagesizedialog.ui
@@ -0,0 +1,143 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>ChangeImageSizeDialog</class>
+ <widget class="QDialog" name="ChangeImageSizeDialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>336</width>
+    <height>332</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Dialog</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <item>
+    <widget class="QLabel" name="label">
+     <property name="text">
+      <string>The size of the image(s) is not equal to the current image. What should happen?</string>
+     </property>
+     <property name="wordWrap">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QGroupBox" name="groupBoxSize">
+     <property name="title">
+      <string>Size</string>
+     </property>
+     <layout class="QVBoxLayout" name="verticalLayout_2">
+      <item>
+       <widget class="QRadioButton" name="radioButtonOriginalSize">
+        <property name="text">
+         <string>Keep original size</string>
+        </property>
+        <property name="checked">
+         <bool>true</bool>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QRadioButton" name="radioButtonNewSize">
+        <property name="text">
+         <string>Use new size</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QRadioButton" name="radioButtonMaximalSize">
+        <property name="text">
+         <string>Use maximal size</string>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <widget class="QGroupBox" name="groupBoxPlacement">
+     <property name="title">
+      <string>Placement</string>
+     </property>
+     <layout class="QVBoxLayout" name="verticalLayout_3">
+      <item>
+       <widget class="QRadioButton" name="radioButtonPlaceTopLeft">
+        <property name="text">
+         <string>Place at left-top</string>
+        </property>
+        <property name="checked">
+         <bool>true</bool>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QRadioButton" name="radioButtonPlaceCenter">
+        <property name="text">
+         <string>Place in center</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QRadioButton" name="radioButtonStretch">
+        <property name="text">
+         <string>Stretch</string>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Orientation::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::StandardButton::Cancel|QDialogButtonBox::StandardButton::Ok</set>
+     </property>
+     <property name="centerButtons">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>ChangeImageSizeDialog</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>248</x>
+     <y>254</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>ChangeImageSizeDialog</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>316</x>
+     <y>260</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>
diff --git a/src/editor/dialogs/createspritedialog.cpp b/src/editor/dialogs/createspritedialog.cpp
index 6beb3c6..e4a70e0 100644
--- a/src/editor/dialogs/createspritedialog.cpp
+++ b/src/editor/dialogs/createspritedialog.cpp
@@ -2,7 +2,6 @@
 #include "ui_createspritedialog.h"
 
 #include <QMessageBox>
-#include <QPushButton>
 
 #include "editorguiutils.h"
 
diff --git a/src/editor/dialogs/editspritedialog.cpp b/src/editor/dialogs/editspritedialog.cpp
index 726548e..ee7b54b 100644
--- a/src/editor/dialogs/editspritedialog.cpp
+++ b/src/editor/dialogs/editspritedialog.cpp
@@ -9,6 +9,7 @@
 #include "createspritedialog.h"
 #include "imageeditordialog.h"
 #include "imagehelpers.h"
+#include "changeimagesizedialog.h"
 
 EditSpriteDialog::EditSpriteDialog(const std::vector<QPixmap> &pixmaps, const QString &spriteName,
                                    EditorSettings &settings, QWidget *parent) :
@@ -176,8 +177,11 @@ void EditSpriteDialog::addFromFile()
 
     if (!m_model->empty() && m_model->front().size() != pixmap.size())
     {
-        QMessageBox::warning(this, tr("Not yet implemented"), tr("Not yet implemented"));
-        return;
+        ChangeImageSizeDialog dialog{this};
+        if (dialog.exec() == QDialog::Accepted)
+        {
+            QMessageBox::warning(this, tr("Not yet implemented"), tr("Not yet implemented"));
+        }
     }
     else
     {