diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9cd179519..172bf1f48 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -207,6 +207,10 @@ if(TARGET_HEADLESS)
     set(MAGNUM_TARGET_HEADLESS 1)
 endif()
 
+if(CORRADE_TARGET_EMSCRIPTEN)
+    include(UseEmscripten)
+endif()
+
 if(BUILD_GL_TESTS)
     if(MAGNUM_TARGET_HEADLESS)
         set(WITH_WINDOWLESSEGLAPPLICATION ON)
diff --git a/src/Magnum/Math/Test/TypeTraitsTest.cpp b/src/Magnum/Math/Test/TypeTraitsTest.cpp
index 7f733e6ed..21b8fa33d 100644
--- a/src/Magnum/Math/Test/TypeTraitsTest.cpp
+++ b/src/Magnum/Math/Test/TypeTraitsTest.cpp
@@ -48,8 +48,10 @@ TypeTraitsTest::TypeTraitsTest() {
               &TypeTraitsTest::equalsIntegral<Short>,
               &TypeTraitsTest::equalsIntegral<UnsignedInt>,
               &TypeTraitsTest::equalsIntegral<Int>,
+              #ifndef CORRADE_TARGET_EMSCRIPTEN
               &TypeTraitsTest::equalsIntegral<UnsignedLong>,
               &TypeTraitsTest::equalsIntegral<Long>,
+              #endif
               &TypeTraitsTest::equalsFloatingPoint0<Float>,
               #ifndef MAGNUM_TARGET_GLES
               &TypeTraitsTest::equalsFloatingPoint0<Double>,
diff --git a/src/Magnum/Test/CMakeLists.txt b/src/Magnum/Test/CMakeLists.txt
index a2bca782f..8675864a1 100644
--- a/src/Magnum/Test/CMakeLists.txt
+++ b/src/Magnum/Test/CMakeLists.txt
@@ -27,7 +27,9 @@ corrade_add_test(AbstractShaderProgramTest AbstractShaderProgramTest.cpp LIBRARI
 corrade_add_test(ArrayTest ArrayTest.cpp LIBRARIES Magnum)
 corrade_add_test(FormatTest FormatTest.cpp LIBRARIES Magnum)
 corrade_add_test(ContextTest ContextTest.cpp LIBRARIES Magnum)
-corrade_add_test(DebugOutputTest DebugOutputTest.cpp LIBRARIES Magnum)
+if(NOT MAGNUM_TARGET_WEBGL)
+    corrade_add_test(DebugOutputTest DebugOutputTest.cpp LIBRARIES Magnum)
+endif()
 corrade_add_test(DefaultFramebufferTest DefaultFramebufferTest.cpp LIBRARIES Magnum)
 corrade_add_test(FramebufferTest FramebufferTest.cpp LIBRARIES Magnum)
 corrade_add_test(ImageTest ImageTest.cpp LIBRARIES Magnum)
diff --git a/src/Magnum/Test/ContextTest.cpp b/src/Magnum/Test/ContextTest.cpp
index 67d9346bf..2a0927ca7 100644
--- a/src/Magnum/Test/ContextTest.cpp
+++ b/src/Magnum/Test/ContextTest.cpp
@@ -41,9 +41,13 @@ ContextTest::ContextTest() {
 }
 
 void ContextTest::debugFlag() {
+    #ifdef MAGNUM_TARGET_WEBGL
+    CORRADE_SKIP("No context flags on Emscripten yet.");
+    #else
     std::ostringstream out;
     Debug(&out) << Context::Flag::Debug;
     CORRADE_COMPARE(out.str(), "Context::Flag::Debug\n");
+    #endif
 }
 
 }}
diff --git a/src/Magnum/Test/DefaultFramebufferTest.cpp b/src/Magnum/Test/DefaultFramebufferTest.cpp
index 254d5b14c..98f64189a 100644
--- a/src/Magnum/Test/DefaultFramebufferTest.cpp
+++ b/src/Magnum/Test/DefaultFramebufferTest.cpp
@@ -43,8 +43,8 @@ DefaultFramebufferTest::DefaultFramebufferTest() {
 void DefaultFramebufferTest::debugStatus() {
     std::ostringstream out;
 
-    Debug(&out) << DefaultFramebuffer::Status::Undefined;
-    CORRADE_COMPARE(out.str(), "DefaultFramebuffer::Status::Undefined\n");
+    Debug(&out) << DefaultFramebuffer::Status::Complete;
+    CORRADE_COMPARE(out.str(), "DefaultFramebuffer::Status::Complete\n");
 }
 
 }}
diff --git a/src/Magnum/Test/ImageTest.cpp b/src/Magnum/Test/ImageTest.cpp
index 224855a2f..5f6e9347c 100644
--- a/src/Magnum/Test/ImageTest.cpp
+++ b/src/Magnum/Test/ImageTest.cpp
@@ -65,12 +65,12 @@ ImageTest::ImageTest() {
 }
 
 void ImageTest::construct() {
-    auto data = new char[3];
+    auto data = new char[3*4];
     Image2D a{PixelStorage{}.setAlignment(1),
-        PixelFormat::Red, PixelType::UnsignedByte, {1, 3}, Containers::Array<char>{data, 3}};
+        PixelFormat::RGBA, PixelType::UnsignedByte, {1, 3}, Containers::Array<char>{data, 3*4}};
 
     CORRADE_COMPARE(a.storage().alignment(), 1);
-    CORRADE_COMPARE(a.format(), PixelFormat::Red);
+    CORRADE_COMPARE(a.format(), PixelFormat::RGBA);
     CORRADE_COMPARE(a.type(), PixelType::UnsignedByte);
     CORRADE_COMPARE(a.size(), Vector2i(1, 3));
     CORRADE_COMPARE(a.data(), data);
@@ -104,16 +104,16 @@ void ImageTest::constructCopyCompressed() {
 }
 
 void ImageTest::constructMove() {
-    auto data = new char[3];
+    auto data = new char[3*3];
     Image2D a{PixelStorage{}.setAlignment(1),
-        PixelFormat::Red, PixelType::UnsignedByte, {1, 3}, Containers::Array<char>{data, 3}};
+        PixelFormat::RGB, PixelType::UnsignedByte, {1, 3}, Containers::Array<char>{data, 3*3}};
     Image2D b(std::move(a));
 
     CORRADE_COMPARE(a.data(), nullptr);
     CORRADE_COMPARE(a.size(), Vector2i());
 
     CORRADE_COMPARE(b.storage().alignment(), 1);
-    CORRADE_COMPARE(b.format(), PixelFormat::Red);
+    CORRADE_COMPARE(b.format(), PixelFormat::RGB);
     CORRADE_COMPARE(b.type(), PixelType::UnsignedByte);
     CORRADE_COMPARE(b.size(), Vector2i(1, 3));
     CORRADE_COMPARE(b.data(), data);
@@ -126,7 +126,7 @@ void ImageTest::constructMove() {
     CORRADE_COMPARE(b.size(), Vector2i(2, 6));
 
     CORRADE_COMPARE(c.storage().alignment(), 1);
-    CORRADE_COMPARE(c.format(), PixelFormat::Red);
+    CORRADE_COMPARE(c.format(), PixelFormat::RGB);
     CORRADE_COMPARE(c.type(), PixelType::UnsignedByte);
     CORRADE_COMPARE(c.size(), Vector2i(1, 3));
     CORRADE_COMPARE(c.data(), data);
@@ -170,9 +170,9 @@ void ImageTest::constructMoveCompressed() {
 }
 
 void ImageTest::setData() {
-    auto data = new char[3];
+    auto data = new char[3*3];
     Image2D a{PixelStorage{}.setAlignment(1),
-        PixelFormat::Red, PixelType::UnsignedByte, {1, 3}, Containers::Array<char>{data, 3}};
+        PixelFormat::RGB, PixelType::UnsignedByte, {1, 3}, Containers::Array<char>{data, 3*3}};
     auto data2 = new char[2*2*4];
     a.setData(PixelFormat::RGBA, PixelType::UnsignedShort, {2, 1}, Containers::Array<char>{data2, 2*2*4});
 
@@ -203,13 +203,13 @@ void ImageTest::setDataCompressed() {
 }
 
 void ImageTest::toView() {
-    auto data = new char[3];
+    auto data = new char[3*3];
     const Image2D a{PixelStorage{}.setAlignment(1),
-        PixelFormat::Red, PixelType::UnsignedByte, {1, 3}, Containers::Array<char>{data, 3}};
+        PixelFormat::RGB, PixelType::UnsignedByte, {1, 3}, Containers::Array<char>{data, 3*3}};
     ImageView2D b = a;
 
     CORRADE_COMPARE(b.storage().alignment(), 1);
-    CORRADE_COMPARE(b.format(), PixelFormat::Red);
+    CORRADE_COMPARE(b.format(), PixelFormat::RGB);
     CORRADE_COMPARE(b.type(), PixelType::UnsignedByte);
     CORRADE_COMPARE(b.size(), Vector2i(1, 3));
     CORRADE_COMPARE(b.data(), data);
@@ -235,7 +235,7 @@ void ImageTest::toViewCompressed() {
 
 void ImageTest::release() {
     char data[] = {'c', 'a', 'f', 'e'};
-    Image2D a(PixelFormat::Red, PixelType::UnsignedByte, {4, 1}, Containers::Array<char>{data, 4});
+    Image2D a(PixelFormat::RGBA, PixelType::UnsignedByte, {1, 1}, Containers::Array<char>{data, 4});
     const char* const pointer = a.release().release();
 
     CORRADE_COMPARE(pointer, data);
diff --git a/src/Magnum/Test/ImageViewTest.cpp b/src/Magnum/Test/ImageViewTest.cpp
index 47074ae7f..45c8cf8df 100644
--- a/src/Magnum/Test/ImageViewTest.cpp
+++ b/src/Magnum/Test/ImageViewTest.cpp
@@ -51,12 +51,12 @@ ImageViewTest::ImageViewTest() {
 }
 
 void ImageViewTest::construct() {
-    const char data[3]{};
+    const char data[3*3]{};
     ImageView2D a{PixelStorage{}.setAlignment(1),
-        PixelFormat::Red, PixelType::UnsignedByte, {1, 3}, data};
+        PixelFormat::RGB, PixelType::UnsignedByte, {1, 3}, data};
 
     CORRADE_COMPARE(a.storage().alignment(), 1);
-    CORRADE_COMPARE(a.format(), PixelFormat::Red);
+    CORRADE_COMPARE(a.format(), PixelFormat::RGB);
     CORRADE_COMPARE(a.type(), PixelType::UnsignedByte);
     CORRADE_COMPARE(a.size(), Vector2i(1, 3));
     CORRADE_COMPARE(a.data(), data);
@@ -86,14 +86,14 @@ void ImageViewTest::constructCompressed() {
 }
 
 void ImageViewTest::setData() {
-    const char data[3]{};
+    const char data[3*3]{};
     ImageView2D a{PixelStorage{}.setAlignment(1),
-        PixelFormat::Red, PixelType::UnsignedByte, {1, 3}, data};
-    const char data2[3]{};
+        PixelFormat::RGB, PixelType::UnsignedByte, {1, 3}, data};
+    const char data2[3*3]{};
     a.setData(data2);
 
     CORRADE_COMPARE(a.storage().alignment(), 1);
-    CORRADE_COMPARE(a.format(), PixelFormat::Red);
+    CORRADE_COMPARE(a.format(), PixelFormat::RGB);
     CORRADE_COMPARE(a.type(), PixelType::UnsignedByte);
     CORRADE_COMPARE(a.size(), Vector2i(1, 3));
     CORRADE_COMPARE(a.data(), data2);
diff --git a/src/Magnum/Test/PixelStorageTest.cpp b/src/Magnum/Test/PixelStorageTest.cpp
index 41f96a356..af298516e 100644
--- a/src/Magnum/Test/PixelStorageTest.cpp
+++ b/src/Magnum/Test/PixelStorageTest.cpp
@@ -38,7 +38,9 @@ struct PixelStorageTest: TestSuite::Tester {
 
     void dataProperties();
     void dataPropertiesAlignment();
+    #if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
     void dataPropertiesRowLength();
+    #endif
     #ifndef MAGNUM_TARGET_GLES2
     void dataPropertiesImageHeight();
     #endif
@@ -61,7 +63,9 @@ PixelStorageTest::PixelStorageTest() {
 
               &PixelStorageTest::dataProperties,
               &PixelStorageTest::dataPropertiesAlignment,
+              #if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
               &PixelStorageTest::dataPropertiesRowLength,
+              #endif
               #ifndef MAGNUM_TARGET_GLES2
               &PixelStorageTest::dataPropertiesImageHeight,
               #endif
@@ -81,7 +85,9 @@ PixelStorageTest::PixelStorageTest() {
 void PixelStorageTest::pixelSize() {
     CORRADE_COMPARE(PixelStorage::pixelSize(PixelFormat::RGBA, PixelType::UnsignedInt), 4*4);
     CORRADE_COMPARE(PixelStorage::pixelSize(PixelFormat::DepthComponent, PixelType::UnsignedShort), 2);
+    #ifndef MAGNUM_TARGET_WEBGL
     CORRADE_COMPARE(PixelStorage::pixelSize(PixelFormat::StencilIndex, PixelType::UnsignedByte), 1);
+    #endif
     CORRADE_COMPARE(PixelStorage::pixelSize(PixelFormat::DepthStencil, PixelType::UnsignedInt248), 4);
 }
 
@@ -93,12 +99,14 @@ void PixelStorageTest::dataProperties() {
         (std::tuple<std::size_t, Vector3st, std::size_t>{0, {0, 0, 0}, 4}));
     CORRADE_COMPARE(storage.dataProperties(PixelFormat::RGBA, PixelType::UnsignedByte, Vector3i{1}),
         (std::tuple<std::size_t, Vector3st, std::size_t>{0, {4, 1, 1}, 4}));
+    #if !defined(MAGNUM_TARGET_WEBGL) && !defined(MAGNUM_TARGET_GLES2)
     CORRADE_COMPARE(storage.dataProperties(PixelFormat::Red, PixelType::UnsignedByte, {8, 2, 1}),
         (std::tuple<std::size_t, Vector3st, std::size_t>{0, {8, 2, 1}, 1}));
     CORRADE_COMPARE(storage.dataProperties(PixelFormat::Red, PixelType::UnsignedByte, {2, 4, 1}),
         (std::tuple<std::size_t, Vector3st, std::size_t>{0, {2, 4, 1}, 1}));
     CORRADE_COMPARE(storage.dataProperties(PixelFormat::Red, PixelType::UnsignedByte, {2, 4, 6}),
         (std::tuple<std::size_t, Vector3st, std::size_t>{0, {2, 4, 6}, 1}));
+    #endif
 }
 
 void PixelStorageTest::dataPropertiesAlignment() {
@@ -110,14 +118,17 @@ void PixelStorageTest::dataPropertiesAlignment() {
         (std::tuple<std::size_t, Vector3st, std::size_t>{3*4, {0, 0, 0}, 4}));
     CORRADE_COMPARE(storage.dataProperties(PixelFormat::RGBA, PixelType::UnsignedByte, Vector3i{1}),
         (std::tuple<std::size_t, Vector3st, std::size_t>{8 + 16 + 3*4, {8, 1, 1}, 4}));
+    #if !defined(MAGNUM_TARGET_WEBGL) && !defined(MAGNUM_TARGET_GLES2)
     CORRADE_COMPARE(storage.dataProperties(PixelFormat::Red, PixelType::UnsignedByte, {8, 2, 1}),
         (std::tuple<std::size_t, Vector3st, std::size_t>{16 + 16 + 3, {8, 2, 1}, 1}));
     CORRADE_COMPARE(storage.dataProperties(PixelFormat::Red, PixelType::UnsignedByte, {2, 4, 1}),
         (std::tuple<std::size_t, Vector3st, std::size_t>{32 + 16 + 3, {8, 4, 1}, 1}));
     CORRADE_COMPARE(storage.dataProperties(PixelFormat::Red, PixelType::UnsignedByte, {2, 4, 6}),
         (std::tuple<std::size_t, Vector3st, std::size_t>{32 + 16 + 3, {8, 4, 6}, 1}));
+    #endif
 }
 
+#if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
 void PixelStorageTest::dataPropertiesRowLength() {
     PixelStorage storage;
     storage.setAlignment(4)
@@ -135,6 +146,7 @@ void PixelStorageTest::dataPropertiesRowLength() {
     CORRADE_COMPARE(storage.dataProperties(PixelFormat::Red, PixelType::UnsignedByte, {2, 4, 6}),
         (std::tuple<std::size_t, Vector3st, std::size_t>{3 + 7*16, {16, 4, 6}, 1}));
 }
+#endif
 
 #ifndef MAGNUM_TARGET_GLES2
 void PixelStorageTest::dataPropertiesImageHeight() {
@@ -159,19 +171,24 @@ void PixelStorageTest::dataPropertiesImageHeight() {
 void PixelStorageTest::dataSize() {
     /* The same parameters as in PixelStorageGLTest 3D case */
     const Image2D image{PixelStorage{}.setAlignment(2)
+        #if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
         .setRowLength(3)
+        #endif
         #ifndef MAGNUM_TARGET_GLES2
         .setImageHeight(5)
         #endif
         .setSkip({2, 3, 1}),
         PixelFormat::RGB, PixelType::UnsignedByte};
 
-    #ifndef MAGNUM_TARGET_GLES2
+    #if defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2)
     CORRADE_COMPARE(Implementation::imageDataSizeFor(image, Vector2i{2, 3}),
-        5*10 + 3*10 + 6 + 3*10);
-    #else
+        3*6 + 3*6 + 6 + 3*6);
+    #elif defined(MAGNUM_TARGET_GLES2)
     CORRADE_COMPARE(Implementation::imageDataSizeFor(image, Vector2i{2, 3}),
         3*10 + 3*10 + 6 + 3*10);
+    #else
+    CORRADE_COMPARE(Implementation::imageDataSizeFor(image, Vector2i{2, 3}),
+        5*10 + 3*10 + 6 + 3*10);
     #endif
 }
 
diff --git a/src/Magnum/Test/RendererTest.cpp b/src/Magnum/Test/RendererTest.cpp
index 5aaa689c5..5564ccb3b 100644
--- a/src/Magnum/Test/RendererTest.cpp
+++ b/src/Magnum/Test/RendererTest.cpp
@@ -34,12 +34,19 @@ struct RendererTest: TestSuite::Tester {
     explicit RendererTest();
 
     void debugError();
+    #ifndef MAGNUM_TARGET_WEBGL
     void debugResetNotificationStrategy();
     void debugGraphicsResetStatus();
+    #endif
 };
 
 RendererTest::RendererTest() {
-    addTests({&RendererTest::debugError});
+    addTests({&RendererTest::debugError,
+              #ifndef MAGNUM_TARGET_WEBGL
+              &RendererTest::debugResetNotificationStrategy,
+              &RendererTest::debugGraphicsResetStatus
+              #endif
+              });
 }
 
 void RendererTest::debugError() {
@@ -49,6 +56,7 @@ void RendererTest::debugError() {
     CORRADE_COMPARE(out.str(), "Renderer::Error::InvalidOperation\n");
 }
 
+#ifndef MAGNUM_TARGET_WEBGL
 void RendererTest::debugResetNotificationStrategy() {
     std::ostringstream out;
 
@@ -62,6 +70,7 @@ void RendererTest::debugGraphicsResetStatus() {
     Debug(&out) << Renderer::GraphicsResetStatus::GuiltyContextReset;
     CORRADE_COMPARE(out.str(), "Renderer::GraphicsResetStatus::GuiltyContextReset\n");
 }
+#endif
 
 }}
 
diff --git a/src/Magnum/Test/SamplerTest.cpp b/src/Magnum/Test/SamplerTest.cpp
index 621edffde..a7e1a87f6 100644
--- a/src/Magnum/Test/SamplerTest.cpp
+++ b/src/Magnum/Test/SamplerTest.cpp
@@ -36,8 +36,10 @@ struct SamplerTest: TestSuite::Tester {
     void debugFilter();
     void debugMipmap();
     void debugWrapping();
+    #if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
     void debugCompareMode();
     void debugCompareFunction();
+    #endif
     #ifndef MAGNUM_TARGET_GLES
     void debugDepthStencilMode();
     #endif
@@ -47,8 +49,10 @@ SamplerTest::SamplerTest() {
     addTests({&SamplerTest::debugFilter,
               &SamplerTest::debugMipmap,
               &SamplerTest::debugWrapping,
+              #if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
               &SamplerTest::debugCompareMode,
               &SamplerTest::debugCompareFunction,
+              #endif
               #ifndef MAGNUM_TARGET_GLES
               &SamplerTest::debugDepthStencilMode
               #endif
@@ -76,6 +80,7 @@ void SamplerTest::debugWrapping() {
     CORRADE_COMPARE(out.str(), "Sampler::Wrapping::ClampToEdge\n");
 }
 
+#if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
 void SamplerTest::debugCompareMode() {
     std::ostringstream out;
 
@@ -89,6 +94,7 @@ void SamplerTest::debugCompareFunction() {
     Debug(&out) << Sampler::CompareFunction::GreaterOrEqual;
     CORRADE_COMPARE(out.str(), "Sampler::CompareFunction::GreaterOrEqual\n");
 }
+#endif
 
 #ifndef MAGNUM_TARGET_GLES
 void SamplerTest::debugDepthStencilMode() {
diff --git a/src/Magnum/Test/VersionTest.cpp b/src/Magnum/Test/VersionTest.cpp
index d439b7b02..3ce871418 100644
--- a/src/Magnum/Test/VersionTest.cpp
+++ b/src/Magnum/Test/VersionTest.cpp
@@ -108,10 +108,12 @@ void VersionTest::debug() {
     Debug(&out) << Version::GLES200;
     #endif
 
-    #ifndef MAGNUM_TARGET_GLES
-    CORRADE_COMPARE(out.str(), "OpenGL 2.1\n");
-    #else
+    #ifdef MAGNUM_TARGET_WEBGL
+    CORRADE_COMPARE(out.str(), "WebGL 1.0\n");
+    #elif defined(MAGNUM_TARGET_GLES)
     CORRADE_COMPARE(out.str(), "OpenGL ES 2.0\n");
+    #else
+    CORRADE_COMPARE(out.str(), "OpenGL 2.1\n");
     #endif
 }
 
diff --git a/src/Magnum/Text/Test/AbstractFontConverterTest.cpp b/src/Magnum/Text/Test/AbstractFontConverterTest.cpp
index 3cca1727e..28773364c 100644
--- a/src/Magnum/Text/Test/AbstractFontConverterTest.cpp
+++ b/src/Magnum/Text/Test/AbstractFontConverterTest.cpp
@@ -62,6 +62,9 @@ AbstractFontConverterTest::AbstractFontConverterTest() {
 
               &AbstractFontConverterTest::importGlyphCacheFromSingleData,
               &AbstractFontConverterTest::importGlyphCacheFromFile});
+
+    /* Create testing dir */
+    Utility::Directory::mkpath(TEXT_TEST_OUTPUT_DIR);
 }
 
 namespace {
diff --git a/src/Magnum/Text/Test/CMakeLists.txt b/src/Magnum/Text/Test/CMakeLists.txt
index 1fe654601..13552d5b9 100644
--- a/src/Magnum/Text/Test/CMakeLists.txt
+++ b/src/Magnum/Text/Test/CMakeLists.txt
@@ -23,6 +23,14 @@
 #   DEALINGS IN THE SOFTWARE.
 #
 
+if(CORRADE_TARGET_EMSCRIPTEN)
+    set(TEXT_TEST_DIR "")
+    set(TEXT_TEST_OUTPUT_DIR "/write")
+else()
+    set(TEXT_TEST_DIR ${CMAKE_CURRENT_SOURCE_DIR})
+    set(TEXT_TEST_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR})
+endif()
+
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/configure.h.cmake
                ${CMAKE_CURRENT_BINARY_DIR}/configure.h)
 
@@ -32,6 +40,11 @@ corrade_add_test(TextAbstractFontConverterTest AbstractFontConverterTest.cpp LIB
 target_include_directories(TextAbstractFontConverterTest PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
 corrade_add_test(TextAbstractLayouterTest AbstractLayouterTest.cpp LIBRARIES Magnum MagnumText)
 
+if(CORRADE_TARGET_EMSCRIPTEN)
+    emscripten_embed_file(TextAbstractFontTest data.bin "/data.bin")
+    emscripten_embed_file(TextAbstractFontConverterTest data.bin "/data.bin")
+endif()
+
 if(BUILD_GL_TESTS)
     corrade_add_test(TextGlyphCacheGLTest GlyphCacheGLTest.cpp LIBRARIES MagnumText ${GL_TEST_LIBRARIES})
     corrade_add_test(TextRendererGLTest RendererGLTest.cpp LIBRARIES MagnumText ${GL_TEST_LIBRARIES})
diff --git a/src/Magnum/Text/Test/configure.h.cmake b/src/Magnum/Text/Test/configure.h.cmake
index 96f3e6a59..e3f4cc05d 100644
--- a/src/Magnum/Text/Test/configure.h.cmake
+++ b/src/Magnum/Text/Test/configure.h.cmake
@@ -23,5 +23,5 @@
     DEALINGS IN THE SOFTWARE.
 */
 
-#define TEXT_TEST_DIR "${CMAKE_CURRENT_SOURCE_DIR}"
-#define TEXT_TEST_OUTPUT_DIR "${CMAKE_CURRENT_BINARY_DIR}"
+#define TEXT_TEST_DIR "${TEXT_TEST_DIR}"
+#define TEXT_TEST_OUTPUT_DIR "${TEXT_TEST_OUTPUT_DIR}"
diff --git a/src/Magnum/Trade/Test/AbstractImageConverterTest.cpp b/src/Magnum/Trade/Test/AbstractImageConverterTest.cpp
index fc2b86f2e..d70edd92c 100644
--- a/src/Magnum/Trade/Test/AbstractImageConverterTest.cpp
+++ b/src/Magnum/Trade/Test/AbstractImageConverterTest.cpp
@@ -45,6 +45,9 @@ class AbstractImageConverterTest: public TestSuite::Tester {
 
 AbstractImageConverterTest::AbstractImageConverterTest() {
     addTests({&AbstractImageConverterTest::exportToFile});
+
+    /* Create testing dir */
+    Utility::Directory::mkpath(TRADE_TEST_OUTPUT_DIR);
 }
 
 void AbstractImageConverterTest::exportToFile() {
diff --git a/src/Magnum/Trade/Test/CMakeLists.txt b/src/Magnum/Trade/Test/CMakeLists.txt
index ffe52e9c9..6cbc59e29 100644
--- a/src/Magnum/Trade/Test/CMakeLists.txt
+++ b/src/Magnum/Trade/Test/CMakeLists.txt
@@ -23,6 +23,14 @@
 #   DEALINGS IN THE SOFTWARE.
 #
 
+if(CORRADE_TARGET_EMSCRIPTEN)
+    set(TRADE_TEST_DIR "")
+    set(TRADE_TEST_OUTPUT_DIR "/write")
+else()
+    set(TRADE_TEST_DIR ${CMAKE_CURRENT_SOURCE_DIR})
+    set(TRADE_TEST_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR})
+endif()
+
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/configure.h.cmake
                ${CMAKE_CURRENT_BINARY_DIR}/configure.h)
 
@@ -35,3 +43,7 @@ corrade_add_test(TradeImageDataTest ImageDataTest.cpp LIBRARIES Magnum)
 corrade_add_test(TradeObjectData2DTest ObjectData2DTest.cpp LIBRARIES Magnum)
 corrade_add_test(TradeObjectData3DTest ObjectData3DTest.cpp LIBRARIES Magnum)
 corrade_add_test(TradeTextureDataTest TextureDataTest.cpp LIBRARIES Magnum)
+
+if(CORRADE_TARGET_EMSCRIPTEN)
+    emscripten_embed_file(TradeAbstractImporterTest file.bin "/file.bin")
+endif()
diff --git a/src/Magnum/Trade/Test/ImageDataTest.cpp b/src/Magnum/Trade/Test/ImageDataTest.cpp
index f56132e60..ed8674b93 100644
--- a/src/Magnum/Trade/Test/ImageDataTest.cpp
+++ b/src/Magnum/Trade/Test/ImageDataTest.cpp
@@ -60,13 +60,13 @@ ImageDataTest::ImageDataTest() {
 }
 
 void ImageDataTest::construct() {
-    auto data = new char[3];
+    auto data = new char[3*3];
     Trade::ImageData2D a{PixelStorage{}.setAlignment(1),
-        PixelFormat::Red, PixelType::UnsignedByte, {1, 3}, Containers::Array<char>{data, 3}};
+        PixelFormat::RGB, PixelType::UnsignedByte, {1, 3}, Containers::Array<char>{data, 3*3}};
 
     CORRADE_VERIFY(!a.isCompressed());
     CORRADE_COMPARE(a.storage().alignment(), 1);
-    CORRADE_COMPARE(a.format(), PixelFormat::Red);
+    CORRADE_COMPARE(a.format(), PixelFormat::RGB);
     CORRADE_COMPARE(a.type(), PixelType::UnsignedByte);
     CORRADE_COMPARE(a.size(), Vector2i(1, 3));
     CORRADE_COMPARE(a.data(), data);
@@ -96,9 +96,9 @@ void ImageDataTest::constructCopy() {
 }
 
 void ImageDataTest::constructMove() {
-    auto data = new char[3];
+    auto data = new char[3*3];
     Trade::ImageData2D a{PixelStorage{}.setAlignment(1),
-        PixelFormat::Red, PixelType::UnsignedByte, {1, 3}, Containers::Array<char>{data, 3}};
+        PixelFormat::RGB, PixelType::UnsignedByte, {1, 3}, Containers::Array<char>{data, 3*3}};
     Trade::ImageData2D b(std::move(a));
 
     CORRADE_COMPARE(a.data(), nullptr);
@@ -106,7 +106,7 @@ void ImageDataTest::constructMove() {
 
     CORRADE_VERIFY(!b.isCompressed());
     CORRADE_COMPARE(b.storage().alignment(), 1);
-    CORRADE_COMPARE(b.format(), PixelFormat::Red);
+    CORRADE_COMPARE(b.format(), PixelFormat::RGB);
     CORRADE_COMPARE(b.type(), PixelType::UnsignedByte);
     CORRADE_COMPARE(b.size(), Vector2i(1, 3));
     CORRADE_COMPARE(b.data(), data);
@@ -120,7 +120,7 @@ void ImageDataTest::constructMove() {
 
     CORRADE_VERIFY(!c.isCompressed());
     CORRADE_COMPARE(c.storage().alignment(), 1);
-    CORRADE_COMPARE(c.format(), PixelFormat::Red);
+    CORRADE_COMPARE(c.format(), PixelFormat::RGB);
     CORRADE_COMPARE(c.type(), PixelType::UnsignedByte);
     CORRADE_COMPARE(c.size(), Vector2i(1, 3));
     CORRADE_COMPARE(c.data(), data);
@@ -166,13 +166,15 @@ void ImageDataTest::constructMoveCompressed() {
 }
 
 void ImageDataTest::toView() {
-    auto data = new char[4];
-    const Trade::ImageData2D a{PixelFormat::Red, PixelType::UnsignedByte, {4, 1}, Containers::Array<char>{data, 4}};
+    auto data = new char[3*3];
+    const Trade::ImageData2D a{PixelStorage{}.setAlignment(1),
+        PixelFormat::RGB, PixelType::UnsignedByte, {1, 3}, Containers::Array<char>{data, 3*3}};
     ImageView2D b = a;
 
-    CORRADE_COMPARE(b.format(), PixelFormat::Red);
+    CORRADE_COMPARE(b.storage().alignment(), 1);
+    CORRADE_COMPARE(b.format(), PixelFormat::RGB);
     CORRADE_COMPARE(b.type(), PixelType::UnsignedByte);
-    CORRADE_COMPARE(b.size(), Vector2i(4, 1));
+    CORRADE_COMPARE(b.size(), Vector2i(1, 3));
     CORRADE_COMPARE(b.data(), data);
 }
 
@@ -189,7 +191,7 @@ void ImageDataTest::toViewCompressed() {
 
 void ImageDataTest::release() {
     char data[] = {'b', 'e', 'e', 'r'};
-    Trade::ImageData2D a{PixelFormat::Red, PixelType::UnsignedByte, {4, 1}, Containers::Array<char>{data, 4}};
+    Trade::ImageData2D a{PixelFormat::RGBA, PixelType::UnsignedByte, {1, 1}, Containers::Array<char>{data, 4}};
     const char* const pointer = a.release().release();
 
     CORRADE_COMPARE(pointer, data);
diff --git a/src/Magnum/Trade/Test/configure.h.cmake b/src/Magnum/Trade/Test/configure.h.cmake
index d39dc3cdf..017811a26 100644
--- a/src/Magnum/Trade/Test/configure.h.cmake
+++ b/src/Magnum/Trade/Test/configure.h.cmake
@@ -23,5 +23,5 @@
     DEALINGS IN THE SOFTWARE.
 */
 
-#define TRADE_TEST_DIR "${CMAKE_CURRENT_SOURCE_DIR}"
-#define TRADE_TEST_OUTPUT_DIR "${CMAKE_CURRENT_BINARY_DIR}"
+#define TRADE_TEST_DIR "${TRADE_TEST_DIR}"
+#define TRADE_TEST_OUTPUT_DIR "${TRADE_TEST_OUTPUT_DIR}"
diff --git a/src/MagnumPlugins/ObjImporter/Test/CMakeLists.txt b/src/MagnumPlugins/ObjImporter/Test/CMakeLists.txt
index 134e83d4d..e51873f87 100644
--- a/src/MagnumPlugins/ObjImporter/Test/CMakeLists.txt
+++ b/src/MagnumPlugins/ObjImporter/Test/CMakeLists.txt
@@ -23,8 +23,18 @@
 #   DEALINGS IN THE SOFTWARE.
 #
 
+if(CORRADE_TARGET_EMSCRIPTEN)
+    set(OBJIMPORTER_TEST_DIR "")
+else()
+    set(OBJIMPORTER_TEST_DIR ${CMAKE_CURRENT_SOURCE_DIR})
+endif()
+
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/configure.h.cmake
                ${CMAKE_CURRENT_BINARY_DIR}/configure.h)
 
 corrade_add_test(ObjImporterTest Test.cpp LIBRARIES MagnumObjImporterTestLib)
 target_include_directories(ObjImporterTest PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
+
+if(CORRADE_TARGET_EMSCRIPTEN)
+    emscripten_embed_file(ObjImporterTest "" "/")
+endif()
diff --git a/src/MagnumPlugins/ObjImporter/Test/configure.h.cmake b/src/MagnumPlugins/ObjImporter/Test/configure.h.cmake
index 459564c9c..04d28dd95 100644
--- a/src/MagnumPlugins/ObjImporter/Test/configure.h.cmake
+++ b/src/MagnumPlugins/ObjImporter/Test/configure.h.cmake
@@ -23,4 +23,4 @@
     DEALINGS IN THE SOFTWARE.
 */
 
-#define OBJIMPORTER_TEST_DIR "${CMAKE_CURRENT_SOURCE_DIR}"
+#define OBJIMPORTER_TEST_DIR "${OBJIMPORTER_TEST_DIR}"
diff --git a/src/MagnumPlugins/TgaImageConverter/Test/TgaImageConverterTest.cpp b/src/MagnumPlugins/TgaImageConverter/Test/TgaImageConverterTest.cpp
index 52b003d27..6b2628058 100644
--- a/src/MagnumPlugins/TgaImageConverter/Test/TgaImageConverterTest.cpp
+++ b/src/MagnumPlugins/TgaImageConverter/Test/TgaImageConverterTest.cpp
@@ -87,18 +87,34 @@ TgaImageConverterTest::TgaImageConverterTest() {
 }
 
 void TgaImageConverterTest::wrongFormat() {
-    ImageView2D image(PixelFormat::RG, PixelType::UnsignedByte, {}, nullptr);
+    ImageView2D image{
+        #if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
+        PixelFormat::RG,
+        #else
+        PixelFormat::LuminanceAlpha,
+        #endif
+        PixelType::UnsignedByte, {}, nullptr};
 
     std::ostringstream out;
     Error redirectError{&out};
 
     const auto data = TgaImageConverter().exportToData(image);
     CORRADE_VERIFY(!data);
+    #if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
     CORRADE_COMPARE(out.str(), "Trade::TgaImageConverter::exportToData(): unsupported color format PixelFormat::RG\n");
+    #else
+    CORRADE_COMPARE(out.str(), "Trade::TgaImageConverter::exportToData(): unsupported color format PixelFormat::LuminanceAlpha\n");
+    #endif
 }
 
 void TgaImageConverterTest::wrongType() {
-    ImageView2D image(PixelFormat::Red, PixelType::Float, {}, nullptr);
+    ImageView2D image{
+        #if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
+        PixelFormat::Red,
+        #else
+        PixelFormat::Luminance,
+        #endif
+        PixelType::Float, {}, nullptr};
 
     std::ostringstream out;
     Error redirectError{&out};
diff --git a/src/MagnumPlugins/TgaImporter/Test/CMakeLists.txt b/src/MagnumPlugins/TgaImporter/Test/CMakeLists.txt
index e3499dd25..d74826eac 100644
--- a/src/MagnumPlugins/TgaImporter/Test/CMakeLists.txt
+++ b/src/MagnumPlugins/TgaImporter/Test/CMakeLists.txt
@@ -23,6 +23,12 @@
 #   DEALINGS IN THE SOFTWARE.
 #
 
+if(CORRADE_TARGET_EMSCRIPTEN)
+    set(TGAIMPORTER_TEST_DIR "")
+else()
+    set(TGAIMPORTER_TEST_DIR ${CMAKE_CURRENT_SOURCE_DIR})
+endif()
+
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/configure.h.cmake
                ${CMAKE_CURRENT_BINARY_DIR}/configure.h)
 
@@ -35,3 +41,7 @@ target_include_directories(TgaImporterTest PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
 if(WIN32)
     target_compile_definitions(TgaImporterTest PRIVATE "MAGNUM_TGAIMPORTER_BUILD_STATIC")
 endif()
+
+if(CORRADE_TARGET_EMSCRIPTEN)
+    emscripten_embed_file(TgaImporterTest file.tga "/file.tga")
+endif()
diff --git a/src/MagnumPlugins/TgaImporter/Test/configure.h.cmake b/src/MagnumPlugins/TgaImporter/Test/configure.h.cmake
index cb625138d..9b4aac529 100644
--- a/src/MagnumPlugins/TgaImporter/Test/configure.h.cmake
+++ b/src/MagnumPlugins/TgaImporter/Test/configure.h.cmake
@@ -23,4 +23,4 @@
     DEALINGS IN THE SOFTWARE.
 */
 
-#define TGAIMPORTER_TEST_DIR "${CMAKE_CURRENT_SOURCE_DIR}"
+#define TGAIMPORTER_TEST_DIR "${TGAIMPORTER_TEST_DIR}"