diff --git a/lib/livebook_web/live/session_live/cell_upload_component.ex b/lib/livebook_web/live/session_live/cell_upload_component.ex
index f41d42ed2..320b32a8f 100644
--- a/lib/livebook_web/live/session_live/cell_upload_component.ex
+++ b/lib/livebook_web/live/session_live/cell_upload_component.ex
@@ -82,13 +82,16 @@ defmodule LivebookWeb.SessionLive.CellUploadComponent do
       filename = name <> ext
       destination_file = FileSystem.File.resolve(images_dir, filename)
 
-      with :ok <- FileSystem.File.copy(upload_file, destination_file) do
-        {:ok, filename}
-      end
+      result =
+        with :ok <- FileSystem.File.copy(upload_file, destination_file) do
+          {:ok, filename}
+        end
+
+      {:ok, result}
     end)
     |> case do
       [{:ok, filename}] ->
-        src_path = "images/#{filename}"
+        src_path = "images/#{URI.encode(filename, &URI.char_unreserved?/1)}"
 
         {:noreply,
          socket