diff --git a/Libraries/LibGfx/CMakeLists.txt b/Libraries/LibGfx/CMakeLists.txt
index 894d1d9b69..923356b3e6 100644
--- a/Libraries/LibGfx/CMakeLists.txt
+++ b/Libraries/LibGfx/CMakeLists.txt
@@ -21,6 +21,7 @@ set(SOURCES
     Font/WOFF2/Loader.cpp
     FontCascadeList.cpp
     GradientPainting.cpp
+    Matrix4x4.cpp
     ImageFormats/AVIFLoader.cpp
     ImageFormats/BMPLoader.cpp
     ImageFormats/BMPWriter.cpp
diff --git a/Libraries/LibGfx/Matrix4x4.cpp b/Libraries/LibGfx/Matrix4x4.cpp
new file mode 100644
index 0000000000..828a763f1b
--- /dev/null
+++ b/Libraries/LibGfx/Matrix4x4.cpp
@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2026-present, the Ladybird developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibGfx/Matrix4x4.h>
+#include <LibIPC/Decoder.h>
+#include <LibIPC/Encoder.h>
+
+namespace IPC {
+
+template<>
+ErrorOr<void> encode(Encoder& encoder, Gfx::FloatMatrix4x4 const& matrix)
+{
+    static constexpr size_t element_count = Gfx::FloatMatrix4x4::Size * Gfx::FloatMatrix4x4::Size;
+    TRY(encoder.append(reinterpret_cast<u8 const*>(matrix.elements()), element_count * sizeof(float)));
+    return {};
+}
+
+template<>
+ErrorOr<Gfx::FloatMatrix4x4> decode(Decoder& decoder)
+{
+    static constexpr size_t element_count = Gfx::FloatMatrix4x4::Size * Gfx::FloatMatrix4x4::Size;
+    Gfx::FloatMatrix4x4 matrix;
+    TRY(decoder.decode_into(Bytes { reinterpret_cast<u8*>(matrix.elements()), element_count * sizeof(float) }));
+    return matrix;
+}
+
+}
diff --git a/Libraries/LibGfx/Matrix4x4.h b/Libraries/LibGfx/Matrix4x4.h
index 62c8c1dbea..de15453bd0 100644
--- a/Libraries/LibGfx/Matrix4x4.h
+++ b/Libraries/LibGfx/Matrix4x4.h
@@ -11,6 +11,7 @@
 #include <LibGfx/Matrix.h>
 #include <LibGfx/Vector3.h>
 #include <LibGfx/Vector4.h>
+#include <LibIPC/Forward.h>
 
 namespace Gfx {
 
@@ -96,3 +97,13 @@ typedef Matrix4x4<double> DoubleMatrix4x4;
 using Gfx::DoubleMatrix4x4;
 using Gfx::FloatMatrix4x4;
 using Gfx::Matrix4x4;
+
+namespace IPC {
+
+template<>
+ErrorOr<void> encode(Encoder&, Gfx::FloatMatrix4x4 const&);
+
+template<>
+ErrorOr<Gfx::FloatMatrix4x4> decode(Decoder&);
+
+}