diff --git a/lib/pinchflat/downloading/download_option_builder.ex b/lib/pinchflat/downloading/download_option_builder.ex
index 0bb25e2..dabf407 100644
--- a/lib/pinchflat/downloading/download_option_builder.ex
+++ b/lib/pinchflat/downloading/download_option_builder.ex
@@ -66,7 +66,7 @@ defmodule Pinchflat.Downloading.DownloadOptionBuilder do
           acc ++ [:write_thumbnail, convert_thumbnail: "jpg"]
 
         {:embed_thumbnail, true} ->
-          acc ++ [:embed_thumbnail]
+          acc ++ [:embed_thumbnail, convert_thumbnail: "jpg"]
 
         _ ->
           acc
diff --git a/test/pinchflat/downloading/download_option_builder_test.exs b/test/pinchflat/downloading/download_option_builder_test.exs
index 8d2cc46..22fba78 100644
--- a/test/pinchflat/downloading/download_option_builder_test.exs
+++ b/test/pinchflat/downloading/download_option_builder_test.exs
@@ -141,6 +141,14 @@ defmodule Pinchflat.Downloading.DownloadOptionBuilderTest do
       assert :embed_thumbnail in res
     end
 
+    test "convertes thumbnail to jpg when embed_thumbnail is true", %{media_item: media_item} do
+      media_item = update_media_profile_attribute(media_item, %{embed_thumbnail: true})
+
+      assert {:ok, res} = DownloadOptionBuilder.build(media_item)
+
+      assert {:convert_thumbnail, "jpg"} in res
+    end
+
     test "doesn't include these options when not specified", %{media_item: media_item} do
       media_item = update_media_profile_attribute(media_item, %{embed_thumbnail: false, download_thumbnail: false})