diff --git a/src/pyFAI/gui/pilx/MainWindow.py b/src/pyFAI/gui/pilx/MainWindow.py
index 65e66a4e4..7b14a07b0 100644
--- a/src/pyFAI/gui/pilx/MainWindow.py
+++ b/src/pyFAI/gui/pilx/MainWindow.py
@@ -46,8 +46,6 @@
 from silx.gui import qt
 from silx.gui.colors import Colormap
 from silx.image.marchingsquares import find_contours
-from silx.io.url import DataUrl
-from silx.io import get_data
 from silx.gui.plot.items.image import ImageBase
 
 from .models import ImageIndices
@@ -56,6 +54,7 @@
     compute_radial_values,
     get_dataset,
     get_indices_from_values,
+    get_mask_image,
     get_radial_dataset,
 )
 from .widgets.DiffractionImagePlotWidget import DiffractionImagePlotWidget
@@ -63,10 +62,11 @@
 from .widgets.MapPlotWidget import MapPlotWidget
 from .widgets.TitleWidget import TitleWidget
 from ...io.integration_config import WorkerConfig
-from ...utils.mathutil import binning as rebin_fct
-from ...detectors import Detector
+from ...utils.mathutil import binning
+
 logger = logging.getLogger(__name__)
 
+
 class MainWindow(qt.QMainWindow):
     sigFileChanged = qt.Signal(str)
 
@@ -253,28 +253,25 @@ def getMask(self, image, maskfile=None):
         :return: 2D array
         """
         if maskfile:
-            mask_image = get_data(url=DataUrl(maskfile))
-            if mask_image.shape != image.shape:
-                binning = [m//i for i, m in zip(image.shape, mask_image.shape)]
-                if min(binning)<1:
-                    mask_image = None
-                else:
-                    mask_image = rebin_fct(mask_image, binning)
+            mask_image = get_mask_image(maskfile, image.shape)
         else:
             mask_image = None
+
         detector = self.worker_config.poni.detector
-        if detector:
-            detector_mask = detector.mask
-            if detector.shape != image.shape:
-                detector.guess_binning(image)
-                detector_mask = rebin_fct(detector_mask, detector.binning)
-            if mask_image is None:
-                mask_image = detector_mask
-            else:
-                numpy.logical_or(mask_image, detector_mask, out=mask_image)
-            detector.mask = mask_image
-            mask_image = detector.dynamic_mask(image)
-        return mask_image
+        if not detector:
+            return mask_image
+
+        detector_mask = detector.mask
+        if detector.shape != image.shape:
+            detector.guess_binning(image)
+            detector_mask = binning(detector_mask, detector.binning)
+
+        if mask_image is None:
+            detector.mask = detector_mask
+        else:
+            detector.mask = numpy.logical_or(mask_image, detector_mask)
+
+        return detector.dynamic_mask(image)
 
     def displayImageAtIndices(self, indices: ImageIndices):
         if self._file_name is None:
diff --git a/src/pyFAI/gui/pilx/utils.py b/src/pyFAI/gui/pilx/utils.py
index 66a2c1444..1ac22096b 100644
--- a/src/pyFAI/gui/pilx/utils.py
+++ b/src/pyFAI/gui/pilx/utils.py
@@ -28,6 +28,7 @@
 
 """Tool to visualize diffraction maps."""
 from __future__ import annotations
+
 __author__ = "Loïc Huder"
 __contact__ = "loic.huder@ESRF.eu"
 __license__ = "MIT"
@@ -35,16 +36,20 @@
 __date__ = "19/02/2025"
 __status__ = "development"
 
-from typing import Iterable, Optional
 import logging
+from typing import Iterable, Optional, Tuple
+
 logger = logging.getLogger(__name__)
-import json
+import os.path
+
 import h5py
 import numpy
-import os.path
+from silx.io import get_data
+from silx.io.url import DataUrl
+
 from ...integrator.azimuthal import AzimuthalIntegrator
-from ...detectors import Detector
 from ...io.integration_config import WorkerConfig
+from ...utils.mathutil import binning
 
 
 def compute_radial_values(worker_config: WorkerConfig) -> numpy.ndarray:
@@ -115,3 +120,18 @@ def guess_axis_path(existing_axis_path: str, parent: h5py.Group) -> str | None:
             return guessed_axis_path
 
     return None
+
+
+def get_mask_image(maskfile: str, image_shape: Tuple[int, int]) -> numpy.ndarray | None:
+    """Retrieves mask image from the URL. Rebin to match"""
+    mask_image = get_data(url=DataUrl(maskfile))
+    assert isinstance(mask_image, numpy.ndarray)
+    if mask_image.shape == image_shape:
+        return mask_image
+
+    # If mismatched shapes, try to rebin
+    bin_size = [m // i for i, m in zip(image_shape, mask_image.shape)]
+    if bin_size[0] == 0 or bin_size[1] == 0:
+        return None
+
+    return binning(mask_image, bin_size)