diff --git a/Tests/LibGfx/TestImageDecoder.cpp b/Tests/LibGfx/TestImageDecoder.cpp
index 1deac270b1d..d58797273ff 100644
--- a/Tests/LibGfx/TestImageDecoder.cpp
+++ b/Tests/LibGfx/TestImageDecoder.cpp
@@ -927,6 +927,19 @@ TEST_CASE(test_webp_extended_lossless_animated)
     }
 }
 
+TEST_CASE(test_webp_unpremultiplied_alpha)
+{
+    auto file = TRY_OR_FAIL(Core::MappedFile::map(TEST_INPUT("webp/semi-transparent-pixel.webp"sv)));
+    EXPECT(Gfx::WebPImageDecoderPlugin::sniff(file->bytes()));
+    auto plugin_decoder = TRY_OR_FAIL(Gfx::WebPImageDecoderPlugin::create(file->bytes()));
+
+    auto frame = TRY_OR_FAIL(expect_single_frame_of_size(*plugin_decoder, { 1, 1 }));
+
+    // Webp decodes with unpremultiplied color data, so {R,G,B} can be >A (unlike with premultiplied colors).
+    EXPECT_EQ(frame.image->alpha_type(), Gfx::AlphaType::Unpremultiplied);
+    EXPECT_EQ(frame.image->get_pixel(0, 0), Gfx::Color(255, 255, 255, 128));
+}
+
 TEST_CASE(test_tvg)
 {
     auto file = TRY_OR_FAIL(Core::MappedFile::map(TEST_INPUT("tvg/yak.tvg"sv)));
diff --git a/Tests/LibGfx/test-inputs/webp/semi-transparent-pixel.webp b/Tests/LibGfx/test-inputs/webp/semi-transparent-pixel.webp
new file mode 100644
index 00000000000..e84966543c0
Binary files /dev/null and b/Tests/LibGfx/test-inputs/webp/semi-transparent-pixel.webp differ
diff --git a/Userland/Libraries/LibGfx/ImageFormats/WebPLoader.cpp b/Userland/Libraries/LibGfx/ImageFormats/WebPLoader.cpp
index 9efa648fdec..6630267626a 100644
--- a/Userland/Libraries/LibGfx/ImageFormats/WebPLoader.cpp
+++ b/Userland/Libraries/LibGfx/ImageFormats/WebPLoader.cpp
@@ -139,7 +139,7 @@ static ErrorOr<void> decode_webp_image(WebPLoadingContext& context)
                 return Error::from_string_literal("Failed to decode animated frame");
 
             auto bitmap_format = context.has_alpha ? BitmapFormat::BGRA8888 : BitmapFormat::BGRx8888;
-            auto bitmap = TRY(Bitmap::create(bitmap_format, context.size));
+            auto bitmap = TRY(Bitmap::create(bitmap_format, Gfx::AlphaType::Unpremultiplied, context.size));
 
             memcpy(bitmap->scanline_u8(0), frame_data, context.size.width() * context.size.height() * 4);
 
@@ -150,7 +150,7 @@ static ErrorOr<void> decode_webp_image(WebPLoadingContext& context)
         }
     } else {
         auto bitmap_format = context.has_alpha ? BitmapFormat::BGRA8888 : BitmapFormat::BGRx8888;
-        auto bitmap = TRY(Bitmap::create(bitmap_format, context.size));
+        auto bitmap = TRY(Bitmap::create(bitmap_format, Gfx::AlphaType::Unpremultiplied, context.size));
 
         auto image_data = WebPDecodeBGRAInto(context.data.data(), context.data.size(), bitmap->scanline_u8(0), bitmap->data_size(), bitmap->pitch());
         if (image_data == nullptr)