diff --git a/src/MagnumPlugins/AnyAudioImporter/AnyImporter.cpp b/src/MagnumPlugins/AnyAudioImporter/AnyImporter.cpp
index 57a4614f8..91f0e5ca4 100644
--- a/src/MagnumPlugins/AnyAudioImporter/AnyImporter.cpp
+++ b/src/MagnumPlugins/AnyAudioImporter/AnyImporter.cpp
@@ -47,13 +47,15 @@ void AnyImporter::doClose() { _in = nullptr; }
 void AnyImporter::doOpenFile(const std::string& filename) {
     CORRADE_INTERNAL_ASSERT(manager());
 
+    std::string normalized = Utility::String::lowercase(filename);
+
     /* Detect type from extension */
     std::string plugin;
-    if(Utility::String::endsWith(filename, ".ogg"))
+    if(Utility::String::endsWith(normalized, ".ogg"))
         plugin = "VorbisAudioImporter";
-    else if(Utility::String::endsWith(filename, ".wav"))
+    else if(Utility::String::endsWith(normalized, ".wav"))
         plugin = "WavAudioImporter";
-    else if(Utility::String::endsWith(filename, ".flac"))
+    else if(Utility::String::endsWith(normalized, ".flac"))
         plugin = "FlacAudioImporter";
     else {
         Error() << "Audio::AnyImporter::openFile(): cannot determine type of file" << filename;
diff --git a/src/MagnumPlugins/AnyAudioImporter/Test/AnyAudioImporterTest.cpp b/src/MagnumPlugins/AnyAudioImporter/Test/AnyAudioImporterTest.cpp
index 8a9b731c6..20b0c41a7 100644
--- a/src/MagnumPlugins/AnyAudioImporter/Test/AnyAudioImporterTest.cpp
+++ b/src/MagnumPlugins/AnyAudioImporter/Test/AnyAudioImporterTest.cpp
@@ -59,6 +59,7 @@ constexpr struct {
     const char* plugin;
 } DetectData[]{
     {"OGG", "thunder.ogg", "VorbisAudioImporter"},
+    {"OGG uppercase", "YELL.OGG", "VorbisAudioImporter"},
     {"FLAC", "symphony.flac", "FlacAudioImporter"}
 };
 
diff --git a/src/MagnumPlugins/AnyImageConverter/AnyImageConverter.cpp b/src/MagnumPlugins/AnyImageConverter/AnyImageConverter.cpp
index 22c592ac6..d44940884 100644
--- a/src/MagnumPlugins/AnyImageConverter/AnyImageConverter.cpp
+++ b/src/MagnumPlugins/AnyImageConverter/AnyImageConverter.cpp
@@ -46,24 +46,26 @@ auto AnyImageConverter::doFeatures() const -> Features {
 bool AnyImageConverter::doExportToFile(const ImageView2D& image, const std::string& filename) {
     CORRADE_INTERNAL_ASSERT(manager());
 
+    std::string normalized = Utility::String::lowercase(filename);
+
     /* Detect type from extension */
     std::string plugin;
-    if(Utility::String::endsWith(filename, ".bmp"))
+    if(Utility::String::endsWith(normalized, ".bmp"))
         plugin = "BmpImageConverter";
-    else if(Utility::String::endsWith(filename, ".exr"))
+    else if(Utility::String::endsWith(normalized, ".exr"))
         plugin = "OpenExrImageConverter";
-    else if(Utility::String::endsWith(filename, ".hdr"))
+    else if(Utility::String::endsWith(normalized, ".hdr"))
         plugin = "HdrImageConverter";
-    else if(Utility::String::endsWith(filename, ".jpg") ||
-            Utility::String::endsWith(filename, ".jpeg") ||
-            Utility::String::endsWith(filename, ".jpe"))
+    else if(Utility::String::endsWith(normalized, ".jpg") ||
+            Utility::String::endsWith(normalized, ".jpeg") ||
+            Utility::String::endsWith(normalized, ".jpe"))
         plugin = "JpegImageConverter";
-    else if(Utility::String::endsWith(filename, ".png"))
+    else if(Utility::String::endsWith(normalized, ".png"))
         plugin = "PngImageConverter";
-    else if(Utility::String::endsWith(filename, ".tga") ||
-            Utility::String::endsWith(filename, ".vda") ||
-            Utility::String::endsWith(filename, ".icb") ||
-            Utility::String::endsWith(filename, ".vst"))
+    else if(Utility::String::endsWith(normalized, ".tga") ||
+            Utility::String::endsWith(normalized, ".vda") ||
+            Utility::String::endsWith(normalized, ".icb") ||
+            Utility::String::endsWith(normalized, ".vst"))
         plugin = "TgaImageConverter";
     else {
         Error() << "Trade::AnyImageConverter::exportToFile(): cannot determine type of file" << filename;
diff --git a/src/MagnumPlugins/AnyImageConverter/Test/AnyImageConverterTest.cpp b/src/MagnumPlugins/AnyImageConverter/Test/AnyImageConverterTest.cpp
index 31fad7f32..4b5e60843 100644
--- a/src/MagnumPlugins/AnyImageConverter/Test/AnyImageConverterTest.cpp
+++ b/src/MagnumPlugins/AnyImageConverter/Test/AnyImageConverterTest.cpp
@@ -66,6 +66,7 @@ constexpr struct {
     {"HDR", "file.hdr", "HdrImageConverter"},
     {"JPEG", "file.jpg", "JpegImageConverter"},
     {"JPEG weird extension", "file.jpe", "JpegImageConverter"},
+    {"JPEG uppercase", "output.JPG", "JpegImageConverter"},
     {"PNG", "file.png", "PngImageConverter"}
 };
 
diff --git a/src/MagnumPlugins/AnyImageImporter/AnyImageImporter.cpp b/src/MagnumPlugins/AnyImageImporter/AnyImageImporter.cpp
index c23df528c..51a747a9c 100644
--- a/src/MagnumPlugins/AnyImageImporter/AnyImageImporter.cpp
+++ b/src/MagnumPlugins/AnyImageImporter/AnyImageImporter.cpp
@@ -51,54 +51,56 @@ void AnyImageImporter::doClose() {
 void AnyImageImporter::doOpenFile(const std::string& filename) {
     CORRADE_INTERNAL_ASSERT(manager());
 
+    std::string normalized = Utility::String::lowercase(filename);
+
     /* Detect type from extension */
     std::string plugin;
-    if(Utility::String::endsWith(filename, ".bmp"))
+    if(Utility::String::endsWith(normalized, ".bmp"))
         plugin = "BmpImporter";
-    else if(Utility::String::endsWith(filename, ".dds"))
+    else if(Utility::String::endsWith(normalized, ".dds"))
         plugin = "DdsImporter";
-    else if(Utility::String::endsWith(filename, ".exr"))
+    else if(Utility::String::endsWith(normalized, ".exr"))
         plugin = "OpenExrImporter";
-    else if(Utility::String::endsWith(filename, ".gif"))
+    else if(Utility::String::endsWith(normalized, ".gif"))
         plugin = "GifImporter";
-    else if(Utility::String::endsWith(filename, ".hdr"))
+    else if(Utility::String::endsWith(normalized, ".hdr"))
         plugin = "HdrImporter";
-    else if(Utility::String::endsWith(filename, ".jpg") ||
-            Utility::String::endsWith(filename, ".jpeg") ||
-            Utility::String::endsWith(filename, ".jpe") )
+    else if(Utility::String::endsWith(normalized, ".jpg") ||
+            Utility::String::endsWith(normalized, ".jpeg") ||
+            Utility::String::endsWith(normalized, ".jpe"))
         plugin = "JpegImporter";
-    else if(Utility::String::endsWith(filename, ".jp2"))
+    else if(Utility::String::endsWith(normalized, ".jp2"))
         plugin = "Jpeg2000Importer";
-    else if(Utility::String::endsWith(filename, ".mng"))
+    else if(Utility::String::endsWith(normalized, ".mng"))
         plugin = "MngImporter";
-    else if(Utility::String::endsWith(filename, ".pbm"))
+    else if(Utility::String::endsWith(normalized, ".pbm"))
         plugin = "PbmImporter";
-    else if(Utility::String::endsWith(filename, ".pcx"))
+    else if(Utility::String::endsWith(normalized, ".pcx"))
         plugin = "PcxImporter";
-    else if(Utility::String::endsWith(filename, ".pgm"))
+    else if(Utility::String::endsWith(normalized, ".pgm"))
         plugin = "PgmImporter";
-    else if(Utility::String::endsWith(filename, ".pic"))
+    else if(Utility::String::endsWith(normalized, ".pic"))
         plugin = "PicImporter";
-    else if(Utility::String::endsWith(filename, ".pnm"))
+    else if(Utility::String::endsWith(normalized, ".pnm"))
         plugin = "PnmImporter";
-    else if(Utility::String::endsWith(filename, ".png"))
+    else if(Utility::String::endsWith(normalized, ".png"))
         plugin = "PngImporter";
-    else if(Utility::String::endsWith(filename, ".ppm"))
+    else if(Utility::String::endsWith(normalized, ".ppm"))
         plugin = "PpmImporter";
-    else if(Utility::String::endsWith(filename, ".psd"))
+    else if(Utility::String::endsWith(normalized, ".psd"))
         plugin = "PsdImporter";
-    else if(Utility::String::endsWith(filename, ".sgi") ||
-            Utility::String::endsWith(filename, ".bw") ||
-            Utility::String::endsWith(filename, ".rgb") ||
-            Utility::String::endsWith(filename, ".rgba"))
+    else if(Utility::String::endsWith(normalized, ".sgi") ||
+            Utility::String::endsWith(normalized, ".bw") ||
+            Utility::String::endsWith(normalized, ".rgb") ||
+            Utility::String::endsWith(normalized, ".rgba"))
         plugin = "SgiImporter";
-    else if(Utility::String::endsWith(filename, ".tif") ||
-            Utility::String::endsWith(filename, ".tiff"))
+    else if(Utility::String::endsWith(normalized, ".tif") ||
+            Utility::String::endsWith(normalized, ".tiff"))
         plugin = "TiffImporter";
-    else if(Utility::String::endsWith(filename, ".tga") ||
-            Utility::String::endsWith(filename, ".vda") ||
-            Utility::String::endsWith(filename, ".icb") ||
-            Utility::String::endsWith(filename, ".vst"))
+    else if(Utility::String::endsWith(normalized, ".tga") ||
+            Utility::String::endsWith(normalized, ".vda") ||
+            Utility::String::endsWith(normalized, ".icb") ||
+            Utility::String::endsWith(normalized, ".vst"))
         plugin = "TgaImporter";
     else {
         Error() << "Trade::AnyImageImporter::openFile(): cannot determine type of file" << filename;
diff --git a/src/MagnumPlugins/AnyImageImporter/Test/AnyImageImporterTest.cpp b/src/MagnumPlugins/AnyImageImporter/Test/AnyImageImporterTest.cpp
index 92b42fac1..8a3fa9424 100644
--- a/src/MagnumPlugins/AnyImageImporter/Test/AnyImageImporterTest.cpp
+++ b/src/MagnumPlugins/AnyImageImporter/Test/AnyImageImporterTest.cpp
@@ -75,6 +75,7 @@ constexpr struct {
     {"PNG data", "rgb.png", fileCallback, "PngImporter"},
     {"JPEG", "gray.jpg", nullptr, "JpegImporter"},
     {"JPEG data", "gray.jpg", fileCallback, "JpegImporter"},
+    {"JPEG uppercase", "uppercase.JPG", nullptr, "JpegImporter"},
     {"JPEG2000", "image.jp2", nullptr, "Jpeg2000Importer"},
     {"EXR", "image.exr", nullptr, "OpenExrImporter"},
     {"EXR data", "image.exr", fileCallback, "OpenExrImporter"},
diff --git a/src/MagnumPlugins/AnySceneImporter/AnySceneImporter.cpp b/src/MagnumPlugins/AnySceneImporter/AnySceneImporter.cpp
index 8d2b97776..c072f78f6 100644
--- a/src/MagnumPlugins/AnySceneImporter/AnySceneImporter.cpp
+++ b/src/MagnumPlugins/AnySceneImporter/AnySceneImporter.cpp
@@ -61,63 +61,65 @@ void AnySceneImporter::doClose() {
 void AnySceneImporter::doOpenFile(const std::string& filename) {
     CORRADE_INTERNAL_ASSERT(manager());
 
+    std::string normalized = Utility::String::lowercase(filename);
+
     /* Detect type from extension */
     std::string plugin;
-    if(Utility::String::endsWith(filename, ".3ds") ||
-       Utility::String::endsWith(filename, ".ase"))
+    if(Utility::String::endsWith(normalized, ".3ds") ||
+       Utility::String::endsWith(normalized, ".ase"))
         plugin = "3dsImporter";
-    else if(Utility::String::endsWith(filename, ".ac"))
+    else if(Utility::String::endsWith(normalized, ".ac"))
         plugin = "Ac3dImporter";
-    else if(Utility::String::endsWith(filename, ".blend"))
+    else if(Utility::String::endsWith(normalized, ".blend"))
         plugin = "BlenderImporter";
-    else if(Utility::String::endsWith(filename, ".bvh"))
+    else if(Utility::String::endsWith(normalized, ".bvh"))
         plugin = "BvhImporter";
-    else if(Utility::String::endsWith(filename, ".csm"))
+    else if(Utility::String::endsWith(normalized, ".csm"))
         plugin = "CsmImporter";
-    else if(Utility::String::endsWith(filename, ".dae"))
+    else if(Utility::String::endsWith(normalized, ".dae"))
         plugin = "ColladaImporter";
-    else if(Utility::String::endsWith(filename, ".x"))
+    else if(Utility::String::endsWith(normalized, ".x"))
         plugin = "DirectXImporter";
-    else if(Utility::String::endsWith(filename, ".dxf"))
+    else if(Utility::String::endsWith(normalized, ".dxf"))
         plugin = "DxfImporter";
-    else if(Utility::String::endsWith(filename, ".fbx"))
+    else if(Utility::String::endsWith(normalized, ".fbx"))
         plugin = "FbxImporter";
-    else if(Utility::String::endsWith(filename, ".gltf"))
+    else if(Utility::String::endsWith(normalized, ".gltf"))
         plugin = "GltfImporter";
-    else if(Utility::String::endsWith(filename, ".glb"))
+    else if(Utility::String::endsWith(normalized, ".glb"))
         plugin = "GlbImporter";
-    else if(Utility::String::endsWith(filename, ".ifc"))
+    else if(Utility::String::endsWith(normalized, ".ifc"))
         plugin = "IfcImporter";
-    else if(Utility::String::endsWith(filename, ".irrmesh") ||
-            Utility::String::endsWith(filename, ".irr"))
+    else if(Utility::String::endsWith(normalized, ".irrmesh") ||
+            Utility::String::endsWith(normalized, ".irr"))
         plugin = "IrrlichtImporter";
-    else if(Utility::String::endsWith(filename, ".lwo") ||
-            Utility::String::endsWith(filename, ".lws"))
+    else if(Utility::String::endsWith(normalized, ".lwo") ||
+            Utility::String::endsWith(normalized, ".lws"))
         plugin = "LightWaveImporter";
-    else if(Utility::String::endsWith(filename, ".lxo"))
+    else if(Utility::String::endsWith(normalized, ".lxo"))
         plugin = "ModoImporter";
-    else if(Utility::String::endsWith(filename, ".ms3d"))
+    else if(Utility::String::endsWith(normalized, ".ms3d"))
         plugin = "MilkshapeImporter";
-    else if(Utility::String::endsWith(filename, ".obj"))
+    else if(Utility::String::endsWith(normalized, ".obj"))
         plugin = "ObjImporter";
-    else if(Utility::String::endsWith(filename, ".xml"))
+    else if(Utility::String::endsWith(normalized, ".xml"))
         plugin = "OgreImporter";
-    else if(Utility::String::endsWith(filename, ".ogex"))
+    else if(Utility::String::endsWith(normalized, ".ogex"))
         plugin = "OpenGexImporter";
-    else if(Utility::String::endsWith(filename, ".ply"))
+    else if(Utility::String::endsWith(normalized, ".ply"))
         plugin = "StanfordImporter";
-    else if(Utility::String::endsWith(filename, ".stl"))
+    else if(Utility::String::endsWith(normalized, ".stl"))
         plugin = "StlImporter";
-    else if(Utility::String::endsWith(filename, ".cob") ||
-            Utility::String::endsWith(filename, ".scn"))
+    else if(Utility::String::endsWith(normalized, ".cob") ||
+            Utility::String::endsWith(normalized, ".scn"))
         plugin = "TrueSpaceImporter";
-    else if(Utility::String::endsWith(filename, ".3d"))
+    else if(Utility::String::endsWith(normalized, ".3d"))
         plugin = "UnrealImporter";
-    else if(Utility::String::endsWith(filename, ".smd") ||
-            Utility::String::endsWith(filename, ".vta"))
+    else if(Utility::String::endsWith(normalized, ".smd") ||
+            Utility::String::endsWith(normalized, ".vta"))
         plugin = "ValveImporter";
-    else if(Utility::String::endsWith(filename, ".xgl") ||
-            Utility::String::endsWith(filename, ".zgl"))
+    else if(Utility::String::endsWith(normalized, ".xgl") ||
+            Utility::String::endsWith(normalized, ".zgl"))
         plugin = "XglImporter";
     else {
         Error() << "Trade::AnySceneImporter::openFile(): cannot determine type of file" << filename;
diff --git a/src/MagnumPlugins/AnySceneImporter/Test/AnySceneImporterTest.cpp b/src/MagnumPlugins/AnySceneImporter/Test/AnySceneImporterTest.cpp
index bb857e0b4..7568b8dd3 100644
--- a/src/MagnumPlugins/AnySceneImporter/Test/AnySceneImporterTest.cpp
+++ b/src/MagnumPlugins/AnySceneImporter/Test/AnySceneImporterTest.cpp
@@ -68,6 +68,7 @@ constexpr struct {
     {"glTF binary", "khronos.glb", "GlbImporter"},
     {"OpenGEX", "eric.ogex", "OpenGexImporter"},
     {"Stanford PLY", "bunny.ply", "StanfordImporter"},
+    {"Stanford PLY uppercase", "ARMADI~1.PLY", "StanfordImporter"},
     {"STL", "robot.stl", "StlImporter"},
     /* Not testing everything, only the most important ones */
 };