diff --git a/dangerzone/conversion/doc_to_pixels.py b/dangerzone/conversion/doc_to_pixels.py
index 2151500..ac64be8 100644
--- a/dangerzone/conversion/doc_to_pixels.py
+++ b/dangerzone/conversion/doc_to_pixels.py
@@ -77,6 +77,23 @@ class DocumentToPixels(DangerzoneConverter):
             "application/vnd.oasis.opendocument.text-template": {
                 "type": "libreoffice",
             },
+            # .hwp
+            "application/vnd.hancom.hwp": {
+                "type": "libreoffice",
+            },
+            "application/haansofthwp": {
+                "type": "libreoffice",
+            },
+            "application/x-hwp": {
+                "type": "libreoffice",
+            },
+            # .hwpx
+            "application/vnd.hancom.hwpx": {
+                "type": "libreoffice",
+            },
+            "application/haansofthwpx": {
+                "type": "libreoffice",
+            },
             # At least .odt, .docx, .odg, .odp, .ods, and .pptx
             "application/zip": {
                 "type": "libreoffice",
diff --git a/dangerzone/gui/main_window.py b/dangerzone/gui/main_window.py
index a4b1786..2ea34ff 100644
--- a/dangerzone/gui/main_window.py
+++ b/dangerzone/gui/main_window.py
@@ -358,7 +358,7 @@ class DocSelectionWidget(QtWidgets.QWidget):
         (filenames, _) = QtWidgets.QFileDialog.getOpenFileNames(
             self,
             "Open documents",
-            filter="Documents (*.pdf *.docx *.doc *.docm *.xlsx *.xls *.pptx *.ppt *.odt *.odg *.odp *.ods *.jpg *.jpeg *.gif *.png *.tif *.tiff)",
+            filter="Documents (*.pdf *.docx *.doc *.docm *.xlsx *.xls *.pptx *.ppt *.odt *.odg *.odp *.ods *.hwp *.hwpx *.jpg *.jpeg *.gif *.png *.tif *.tiff)",
         )
         if filenames == []:
             # no files selected
diff --git a/install/pyinstaller/pyinstaller.spec b/install/pyinstaller/pyinstaller.spec
index f8d2380..6234910 100644
--- a/install/pyinstaller/pyinstaller.spec
+++ b/install/pyinstaller/pyinstaller.spec
@@ -143,6 +143,20 @@ if p == "Darwin":
                     "CFBundleTypeName": "ODF Graphics Document",
                     "CFBundleTypeRole": "Viewer",
                 },
+                {
+                    "CFBundleTypeExtensions": ["hwp", "hwpx"],
+                    "CFBundleTypeIconFile": "../macos/document.icns",
+                    "CFBundleTypeMIMETypes": [
+                        "application/vnd.hancom.hwp",
+                        "application/haansofthwp",
+                        "application/x-hwp",
+                        "application/vnd.hancom.hwpx",
+                        "application/haansofthwpx",
+                        "application/vnd.hancom.hwp",
+                    ],
+                    "CFBundleTypeName": "Hancom Office Document",
+                    "CFBundleTypeRole": "Viewer",
+                },
                 {
                     "CFBundleTypeExtensions": ["jpg", "jpeg"],
                     "CFBundleTypeIconFile": "../macos/document.icns",