diff --git a/Userland/Libraries/LibGfx/BitmapMixer.cpp b/Userland/Libraries/LibGfx/BitmapMixer.cpp
new file mode 100644
index 0000000000..2e5269a1ae
--- /dev/null
+++ b/Userland/Libraries/LibGfx/BitmapMixer.cpp
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2022, Tobias Christiansen <tobyase@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "BitmapMixer.h"
+
+namespace Gfx {
+
+void BitmapMixer::mix_with(Bitmap& other_bitmap, MixingMethod mixing_method)
+{
+    VERIFY(m_bitmap.size() == other_bitmap.size());
+
+    int height = m_bitmap.height();
+    int width = m_bitmap.width();
+
+    for (int y = 0; y < height; ++y) {
+        for (int x = 0; x < width; ++x) {
+            auto original_color = m_bitmap.get_pixel(x, y);
+            auto other_color = other_bitmap.get_pixel(x, y);
+
+            Color output_color = { 0, 0, 0, original_color.alpha() };
+            switch (mixing_method) {
+            case MixingMethod::Add:
+                output_color.set_red(original_color.red() + other_color.red());
+                output_color.set_green(original_color.green() + other_color.green());
+                output_color.set_blue(original_color.blue() + other_color.blue());
+                break;
+            case MixingMethod::Lightest:
+                auto original_lightness = original_color.red() + original_color.green() + original_color.blue();
+                auto other_lightness = other_color.red() + other_color.green() + other_color.blue();
+                if (original_lightness > other_lightness) {
+                    output_color = original_color;
+                } else {
+                    output_color.set_red(other_color.red());
+                    output_color.set_green(other_color.green());
+                    output_color.set_blue(other_color.blue());
+                }
+                break;
+            }
+            if (original_color != output_color)
+                m_bitmap.set_pixel(x, y, output_color);
+        }
+    }
+}
+
+}
diff --git a/Userland/Libraries/LibGfx/BitmapMixer.h b/Userland/Libraries/LibGfx/BitmapMixer.h
new file mode 100644
index 0000000000..bd895d7ff5
--- /dev/null
+++ b/Userland/Libraries/LibGfx/BitmapMixer.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2022, Tobias Christiansen <tobyase@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include "Bitmap.h"
+
+namespace Gfx {
+
+class BitmapMixer {
+public:
+    enum class MixingMethod {
+        Add,
+        Lightest,
+    };
+
+    BitmapMixer(Bitmap& bitmap)
+        : m_bitmap(bitmap) {};
+
+    void mix_with(Bitmap&, MixingMethod);
+
+private:
+    Bitmap& m_bitmap;
+};
+
+}
diff --git a/Userland/Libraries/LibGfx/CMakeLists.txt b/Userland/Libraries/LibGfx/CMakeLists.txt
index 3086cd75d2..8e1663abcd 100644
--- a/Userland/Libraries/LibGfx/CMakeLists.txt
+++ b/Userland/Libraries/LibGfx/CMakeLists.txt
@@ -2,6 +2,7 @@ set(SOURCES
     AffineTransform.cpp
     AntiAliasingPainter.cpp
     Bitmap.cpp
+    BitmapMixer.cpp
     BitmapFont.cpp
     BMPLoader.cpp
     BMPWriter.cpp