diff --git a/maps4fs/generator/background.py b/maps4fs/generator/background.py
index 80deae06..894c810a 100644
--- a/maps4fs/generator/background.py
+++ b/maps4fs/generator/background.py
@@ -58,6 +58,10 @@ def preprocess(self) -> None:
         os.makedirs(self.water_directory, exist_ok=True)
 
         self.output_path = os.path.join(self.background_directory, f"{FULL_NAME}.png")
+        if self.map.custom_background_path:
+            self.check_custom_background(self.map.custom_background_path)
+            shutil.copyfile(self.map.custom_background_path, self.output_path)
+
         self.not_substracted_path = os.path.join(self.background_directory, "not_substracted.png")
         self.not_resized_path = os.path.join(self.background_directory, "not_resized.png")
 
@@ -75,6 +79,28 @@ def preprocess(self) -> None:
         self.dem.set_output_resolution((self.rotated_size, self.rotated_size))
         self.dem.set_dem_path(self.output_path)
 
+    def check_custom_background(self, image_path: str) -> None:
+        """Checks if the custom background image meets the requirements.
+
+        Arguments:
+            image_path (str): The path to the custom background image.
+
+        Raises:
+            ValueError: If the custom background image does not meet the requirements.
+        """
+        image = cv2.imread(image_path, cv2.IMREAD_UNCHANGED)  # pylint: disable=no-member
+        if image.shape[0] != image.shape[1]:
+            raise ValueError("The custom background image must be a square.")
+
+        if image.shape[0] != self.map_size + DEFAULT_DISTANCE * 2:
+            raise ValueError("The custom background image must have the size of the map + 4096.")
+
+        if len(image.shape) != 2:
+            raise ValueError("The custom background image must be a grayscale image.")
+
+        if image.dtype != np.uint16:
+            raise ValueError("The custom background image must be a 16-bit grayscale image.")
+
     def is_preview(self, name: str) -> bool:
         """Checks if the DEM is a preview.
 
@@ -91,7 +117,9 @@ def process(self) -> None:
         as a result the DEM files will be saved, then based on them the obj files will be
         generated."""
         self.create_background_textures()
-        self.dem.process()
+
+        if not self.map.custom_background_path:
+            self.dem.process()
 
         shutil.copyfile(self.dem.dem_path, self.not_substracted_path)
         self.cutout(self.dem.dem_path, save_path=self.not_resized_path)
diff --git a/maps4fs/generator/map.py b/maps4fs/generator/map.py
index 4f5e3b03..b501e2a1 100644
--- a/maps4fs/generator/map.py
+++ b/maps4fs/generator/map.py
@@ -140,6 +140,11 @@ def __init__(  # pylint: disable=R0917, R0915
                 json.dump(self.tree_custom_schema, file, indent=4)
             self.logger.debug("Tree custom schema saved to %s", save_path)
 
+        self.custom_background_path = kwargs.get("custom_background_path", None)
+        if self.custom_background_path:
+            save_path = os.path.join(self.map_directory, "custom_background.png")
+            shutil.copyfile(self.custom_background_path, save_path)
+
         try:
             shutil.unpack_archive(game.template_path, self.map_directory)
             self.logger.debug("Map template unpacked to %s", self.map_directory)
diff --git a/webui/generator.py b/webui/generator.py
index 979edef0..2437689f 100644
--- a/webui/generator.py
+++ b/webui/generator.py
@@ -340,6 +340,7 @@ def add_left_widgets(self) -> None:
             on_change=self.map_preview,
         )
 
+        self.custom_background_path = None
         self.expert_mode = False
         self.raw_config = None
 
@@ -422,6 +423,23 @@ def add_left_widgets(self) -> None:
                             label_visibility="collapsed",
                         )
 
+            self.custom_background = st.checkbox(
+                "Upload custom background", value=False, key="custom_background"
+            )
+
+            if self.custom_background:
+                st.info(Messages.CUSTOM_BACKGROUND_INFO)
+
+                uploaded_file = st.file_uploader("Choose a file", type=["png"])
+                if uploaded_file is not None:
+                    timestamp = datetime.now().strftime("%Y-%m-%d_%H-%M-%S")
+                    self.custom_background_path = os.path.join(
+                        config.INPUT_DIRECTORY, f"custom_background_{timestamp}.png"
+                    )
+                    with open(self.custom_background_path, "wb") as f:
+                        f.write(uploaded_file.read())
+                    st.success(f"Custom background uploaded: {uploaded_file.name}")
+
         # Add an empty container for status messages.
         self.status_container = st.empty()
 
@@ -568,6 +586,7 @@ def generate_map(self) -> None:
             satellite_settings=all_settings["SatelliteSettings"],
             texture_custom_schema=texture_schema,
             tree_custom_schema=tree_schema,
+            custom_background_path=self.custom_background_path,
         )
 
         if self.public:
diff --git a/webui/templates.py b/webui/templates.py
index f4ff6311..a78dcff8 100644
--- a/webui/templates.py
+++ b/webui/templates.py
@@ -61,6 +61,14 @@ class Messages:
         "https://github.com/iwatkot/maps4fs/blob/main/docs/custom_osm.md).  \n"
         "Note, that incorrect file can lead to errors or completely broken map."
     )
+    CUSTOM_BACKGROUND_INFO = (
+        "The uploaded file should be:  \n"
+        "- Single-channel (grayscale) unsigned 16-bit PNG image.  \n"
+        "- The size of the image should be map size + 4096 in each dimension, where the map in "
+        "the center.  \n"
+        "- If rotation needed, the image should be rotated already.  \n  \n"
+        "If any of above conditions are not met, generation will fail."
+    )
     EXPERT_MODE_INFO = (
         "In this mode you can edit confuguration of the generation in a raw format. "
         "Be careful, any incorrect value can lead to errors or completely broken map."