diff --git a/modules/globals.py b/modules/globals.py
index 3d88931..f3a1944 100644
--- a/modules/globals.py
+++ b/modules/globals.py
@@ -7,7 +7,7 @@ ROOT_DIR = os.path.dirname(os.path.abspath(__file__))
 WORKFLOW_DIR = os.path.join(ROOT_DIR, "workflow")
 
 file_types = [
-    ("Image", ("*.png", "*.jpg", "*.jpeg", "*.gif", "*.bmp")),
+    ("Image", ("*.png", "*.jpg", "*.jpeg", "*.gif", "*.bmp", "*.webp")),
     ("Video", ("*.mp4", "*.mkv")),
 ]
 
diff --git a/modules/ui.py b/modules/ui.py
index cade5f5..53fecbd 100644
--- a/modules/ui.py
+++ b/modules/ui.py
@@ -733,7 +733,7 @@ class MainWindow(QMainWindow):
         path, _filter = QFileDialog.getOpenFileName(
             self, _("select an source image"),
             _RECENT_SOURCE_DIR or "",
-            "Images (*.png *.jpg *.jpeg *.gif *.bmp)",
+            "Images (*.png *.jpg *.jpeg *.gif *.bmp *.webp)",
         )
         if path and is_image(path):
             modules.globals.source_path = path
@@ -754,7 +754,7 @@ class MainWindow(QMainWindow):
         path, _filter = QFileDialog.getOpenFileName(
             self, _("select an target image or video"),
             _RECENT_TARGET_DIR or "",
-            "Media (*.png *.jpg *.jpeg *.gif *.bmp *.mp4 *.mkv)",
+            "Media (*.png *.jpg *.jpeg *.gif *.bmp *.webp *.mp4 *.mkv)",
         )
         if not path:
             return
@@ -885,7 +885,7 @@ class MainWindow(QMainWindow):
             path, _f = QFileDialog.getSaveFileName(
                 self, _("save image output file"),
                 os.path.join(_RECENT_OUTPUT_DIR or "", "output.png"),
-                "Images (*.png *.jpg *.jpeg *.bmp)",
+                "Images (*.png *.jpg *.jpeg *.gif *.bmp *.webp)",
             )
         elif is_video(modules.globals.target_path):
             path, _f = QFileDialog.getSaveFileName(
@@ -1333,7 +1333,7 @@ class MapperDialog(QDialog):
         path, _f = QFileDialog.getOpenFileName(
             self, _("select an source image"),
             _RECENT_SOURCE_DIR or "",
-            "Images (*.png *.jpg *.jpeg *.gif *.bmp)",
+            "Images (*.png *.jpg *.jpeg *.gif *.bmp *.webp)",
         )
         if not path:
             return
@@ -1438,7 +1438,7 @@ class LiveMapperDialog(QDialog):
         path, _f = QFileDialog.getOpenFileName(
             self, _("select an source image"),
             _RECENT_SOURCE_DIR or "",
-            "Images (*.png *.jpg *.jpeg *.gif *.bmp)",
+            "Images (*.png *.jpg *.jpeg *.gif *.bmp *.webp)",
         )
         if not path:
             return
diff --git a/modules/utilities.py b/modules/utilities.py
index 953ef3c..7ad5df9 100644
--- a/modules/utilities.py
+++ b/modules/utilities.py
@@ -262,11 +262,14 @@ def clean_temp(target_path: str) -> None:
 
 
 def has_image_extension(image_path: str) -> bool:
-    return image_path.lower().endswith(("png", "jpg", "jpeg"))
+    return image_path.lower().endswith(("png", "jpg", "jpeg", "gif", "bmp", "webp"))
 
 
 def is_image(image_path: str) -> bool:
     if image_path and os.path.isfile(image_path):
+        # Extension check first — Windows mimetypes doesn't always register webp
+        if has_image_extension(image_path):
+            return True
         mimetype, _ = mimetypes.guess_type(image_path)
         return bool(mimetype and mimetype.startswith("image/"))
     return False