diff --git a/Base/res/apps/ImageViewer.af b/Base/res/apps/ImageViewer.af
index 2477dbee04..fd99c575d5 100644
--- a/Base/res/apps/ImageViewer.af
+++ b/Base/res/apps/ImageViewer.af
@@ -4,4 +4,4 @@ Executable=/bin/ImageViewer
 Category=Graphics
 
 [Launcher]
-FileTypes=bmp,dds,gif,ico,iff,jpeg,jpg,jxl,pbm,pgm,png,ppm,qoi,tga,tvg
+FileTypes=bmp,dds,gif,ico,iff,jpeg,jpg,jxl,pbm,pgm,png,ppm,qoi,tga,tiff,tif,tvg
diff --git a/Userland/Libraries/LibGUI/FileTypeFilter.h b/Userland/Libraries/LibGUI/FileTypeFilter.h
index c44568e2e2..98bc4e9330 100644
--- a/Userland/Libraries/LibGUI/FileTypeFilter.h
+++ b/Userland/Libraries/LibGUI/FileTypeFilter.h
@@ -25,7 +25,7 @@ struct FileTypeFilter {
 
     static FileTypeFilter image_files()
     {
-        return FileTypeFilter { "Image Files", Vector<DeprecatedString> { "png", "gif", "bmp", "dip", "pbm", "pgm", "ppm", "ico", "iff", "jpeg", "jpg", "jxl", "dds", "qoi", "webp", "tvg" } };
+        return FileTypeFilter { "Image Files", Vector<DeprecatedString> { "png", "gif", "bmp", "dip", "pbm", "pgm", "ppm", "ico", "iff", "jpeg", "jpg", "jxl", "dds", "qoi", "tif", "tiff", "webp", "tvg" } };
     }
 };
 
diff --git a/Userland/Libraries/LibGfx/Bitmap.h b/Userland/Libraries/LibGfx/Bitmap.h
index c6a7a716bf..8b61a7d5fa 100644
--- a/Userland/Libraries/LibGfx/Bitmap.h
+++ b/Userland/Libraries/LibGfx/Bitmap.h
@@ -31,6 +31,8 @@
     __ENUMERATE_IMAGE_FORMAT(ppm, ".ppm")   \
     __ENUMERATE_IMAGE_FORMAT(qoi, ".qoi")   \
     __ENUMERATE_IMAGE_FORMAT(tga, ".tga")   \
+    __ENUMERATE_IMAGE_FORMAT(tiff, ".tif")  \
+    __ENUMERATE_IMAGE_FORMAT(tiff, ".tiff") \
     __ENUMERATE_IMAGE_FORMAT(tvg, ".tvg")   \
     __ENUMERATE_IMAGE_FORMAT(tvg, ".webp")