diff --git a/apps/transport/client/stylesheets/components/_dataset-details.scss b/apps/transport/client/stylesheets/components/_dataset-details.scss
index c00cd2c8ee..ee8afdc85f 100644
--- a/apps/transport/client/stylesheets/components/_dataset-details.scss
+++ b/apps/transport/client/stylesheets/components/_dataset-details.scss
@@ -635,3 +635,12 @@ hr {
     }
   }
 }
+
+.modal .button__group {
+  a.button:hover {
+    background-color: var(--theme-secondary-darken) !important;
+  }
+  a.button.secondary:hover {
+    background-color: var(--darkest-grey) !important;
+  }
+}
diff --git a/apps/transport/lib/transport_web/templates/dataset/_conversions.html.heex b/apps/transport/lib/transport_web/templates/dataset/_conversions.html.heex
index 44003bf494..8c7613d107 100644
--- a/apps/transport/lib/transport_web/templates/dataset/_conversions.html.heex
+++ b/apps/transport/lib/transport_web/templates/dataset/_conversions.html.heex
@@ -4,11 +4,22 @@
 <div class="resource-actions">
   <div>
     <%= for {_, %{format: human_format, stable_url: stable_url}} <- Enum.sort_by(conversions, fn {_, %{format: format}} -> format end, :asc) do %>
-      <a class="download-button" rel="nofollow" href={stable_url}>
+      <%
+      modal_id = "modal-netex-conversion-#{:erlang.phash2(stable_url)}"
+      href = if human_format == "NeTEx", do: "#" <> modal_id, else: stable_url
+      %>
+
+      <a class="download-button" rel="nofollow" href={href}>
         <button class="button-outline secondary no-border small">
           <i class="icon icon--download" aria-hidden="true"></i><%= dgettext("page-dataset-details", "Download") %> <%= human_format %>
         </button>
       </a>
+      <%= if human_format == "NeTEx" do
+        render(TransportWeb.DatasetView, "_netex_conversion_modal.html",
+          stable_url: stable_url,
+          modal_id: modal_id
+        )
+      end %>
     <% end %>
   </div>
 </div>
diff --git a/apps/transport/lib/transport_web/templates/dataset/_netex_conversion_modal.html.heex b/apps/transport/lib/transport_web/templates/dataset/_netex_conversion_modal.html.heex
new file mode 100644
index 0000000000..0f46b101a0
--- /dev/null
+++ b/apps/transport/lib/transport_web/templates/dataset/_netex_conversion_modal.html.heex
@@ -0,0 +1,29 @@
+<div class="modal__backdrop" id={@modal_id}>
+  <div class="modal">
+    <p>
+      <%= dgettext(
+        "page-dataset-details",
+        "Automatic NeTEx conversion are created from the associated GTFS file and don't contain additional information which can be described in NeTEx."
+      ) %>
+    </p>
+    <p class="notification warning">
+      <%= raw(
+        dgettext(
+          "page-dataset-details",
+          "Automatic NeTEx conversions will not be available <b>after 2025-06-01</b>."
+        )
+      ) %>
+    </p>
+    <div class="form__group button__group">
+      <a class="classic button" rel="nofollow" href={@stable_url}>
+        <i class="icon icon--download" aria-hidden="true"></i><%= dgettext(
+          "page-dataset-details",
+          "Download the automatic NeTEx conversion"
+        ) %>
+      </a>
+      <a href="#" class="classic button secondary">
+        <%= dgettext("page-dataset-details", "Cancel") %>
+      </a>
+    </div>
+  </div>
+</div>
diff --git a/apps/transport/priv/gettext/en/LC_MESSAGES/page-dataset-details.po b/apps/transport/priv/gettext/en/LC_MESSAGES/page-dataset-details.po
index fbe6516336..3b44e9572a 100644
--- a/apps/transport/priv/gettext/en/LC_MESSAGES/page-dataset-details.po
+++ b/apps/transport/priv/gettext/en/LC_MESSAGES/page-dataset-details.po
@@ -721,3 +721,19 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "This unofficial dataset is provided experimentally. Do not use it for travel information purpose."
 msgstr ""
+
+#, elixir-autogen, elixir-format
+msgid "Automatic NeTEx conversion are created from the associated GTFS file and don't contain additional information which can be described in NeTEx."
+msgstr ""
+
+#, elixir-autogen, elixir-format
+msgid "Automatic NeTEx conversions will not be available <b>after 2025-06-01</b>."
+msgstr ""
+
+#, elixir-autogen, elixir-format
+msgid "Cancel"
+msgstr ""
+
+#, elixir-autogen, elixir-format
+msgid "Download the automatic NeTEx conversion"
+msgstr ""
diff --git a/apps/transport/priv/gettext/fr/LC_MESSAGES/page-dataset-details.po b/apps/transport/priv/gettext/fr/LC_MESSAGES/page-dataset-details.po
index b49c24f951..d597eb0025 100644
--- a/apps/transport/priv/gettext/fr/LC_MESSAGES/page-dataset-details.po
+++ b/apps/transport/priv/gettext/fr/LC_MESSAGES/page-dataset-details.po
@@ -721,3 +721,19 @@ msgstr "Données sous la responsabilité de"
 #, elixir-autogen, elixir-format
 msgid "This unofficial dataset is provided experimentally. Do not use it for travel information purpose."
 msgstr "Ce jeu de données non officiel est publié à titre expérimental. Veuillez ne pas le réutiliser à des fins d’information voyageur."
+
+#, elixir-autogen, elixir-format
+msgid "Automatic NeTEx conversion are created from the associated GTFS file and don't contain additional information which can be described in NeTEx."
+msgstr "Les conversions automatiques NeTEx sont générées à partir du fichier GTFS associé et ne contiennent pas d'informations supplémentaires qui peuvent être décrites en NeTEx."
+
+#, elixir-autogen, elixir-format
+msgid "Automatic NeTEx conversions will not be available <b>after 2025-06-01</b>."
+msgstr "Les conversions automatiques NeTEx ne seront plus disponibles <b>après le 01/06/2025</b>."
+
+#, elixir-autogen, elixir-format
+msgid "Cancel"
+msgstr "Annuler"
+
+#, elixir-autogen, elixir-format
+msgid "Download the automatic NeTEx conversion"
+msgstr "Télécharger la conversion automatique NeTEx"
diff --git a/apps/transport/priv/gettext/page-dataset-details.pot b/apps/transport/priv/gettext/page-dataset-details.pot
index 43d6d175dd..d44699ffef 100644
--- a/apps/transport/priv/gettext/page-dataset-details.pot
+++ b/apps/transport/priv/gettext/page-dataset-details.pot
@@ -721,3 +721,19 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "This unofficial dataset is provided experimentally. Do not use it for travel information purpose."
 msgstr ""
+
+#, elixir-autogen, elixir-format
+msgid "Automatic NeTEx conversion are created from the associated GTFS file and don't contain additional information which can be described in NeTEx."
+msgstr ""
+
+#, elixir-autogen, elixir-format
+msgid "Automatic NeTEx conversions will not be available <b>after 2025-06-01</b>."
+msgstr ""
+
+#, elixir-autogen, elixir-format
+msgid "Cancel"
+msgstr ""
+
+#, elixir-autogen, elixir-format
+msgid "Download the automatic NeTEx conversion"
+msgstr ""
diff --git a/apps/transport/test/transport_web/controllers/dataset_controller_test.exs b/apps/transport/test/transport_web/controllers/dataset_controller_test.exs
index c57436d36e..db1a2c9de9 100644
--- a/apps/transport/test/transport_web/controllers/dataset_controller_test.exs
+++ b/apps/transport/test/transport_web/controllers/dataset_controller_test.exs
@@ -61,7 +61,7 @@ defmodule TransportWeb.DatasetControllerTest do
       convert_from: "GTFS",
       convert_to: "NeTEx",
       converter: DB.DataConversion.converter_to_use("NeTEx"),
-      payload: %{"permanent_url" => conversion_url = "https://super-cellar-url.com/netex"}
+      payload: %{"permanent_url" => other_conversion_url = "https://super-cellar-url.com/netex"}
     )
 
     Transport.History.Fetcher.Mock
@@ -77,8 +77,23 @@ defmodule TransportWeb.DatasetControllerTest do
       html_response = conn |> get(dataset_path(conn, :details, dataset.slug)) |> html_response(200)
       assert html_response =~ "Conversions automatiques"
       assert html_response =~ "NeTEx"
-      assert html_response =~ conversion_path(conn, :get, resource.id, :NeTEx)
-      refute html_response =~ conversion_url
+
+      # NeTEx conversion's URL is displayed in a modal with 2 buttons
+      netex_url = conversion_url(TransportWeb.Endpoint, :get, resource.id, :NeTEx)
+
+      assert [
+               {"a", [{"class", "classic button"}, {"rel", "nofollow"}, {"href", ^netex_url}],
+                [
+                  {"i", _, []},
+                  "Télécharger la conversion automatique NeTEx\n      "
+                ]},
+               {"a", [{"href", "#"}, {"class", "classic button secondary"}], ["\nAnnuler\n      "]}
+             ] =
+               html_response
+               |> Floki.parse_document!()
+               |> Floki.find(".modal .button__group .button")
+
+      refute html_response =~ other_conversion_url
       refute html_response =~ "GeoJSON"
     end
   end