diff --git a/app/Http/Controllers/ClientPortal/InvoiceController.php b/app/Http/Controllers/ClientPortal/InvoiceController.php
index 9746863da046..ff5a0d493650 100644
--- a/app/Http/Controllers/ClientPortal/InvoiceController.php
+++ b/app/Http/Controllers/ClientPortal/InvoiceController.php
@@ -57,7 +57,7 @@ class InvoiceController extends Controller
         ];
 
         if ($request->query('mode') === 'fullscreen') {
-            return response()->file($invoice->pdf_file_path(null, 'path'));
+            return render('invoices.show-fullscreen', $data);
         }
 
         return $this->render('invoices.show', $data);
diff --git a/resources/views/portal/ninja2020/invoices/show-fullscreen.blade.php b/resources/views/portal/ninja2020/invoices/show-fullscreen.blade.php
new file mode 100644
index 000000000000..8b1bb3b8da23
--- /dev/null
+++ b/resources/views/portal/ninja2020/invoices/show-fullscreen.blade.php
@@ -0,0 +1,2 @@
+<iframe src="{{ $invoice->pdf_file_path() }}"
+        style="position:fixed; top:0; left:0; bottom:0; right:0; width:100%; height:100%; border:none; margin:0; padding:0; overflow:hidden; z-index:999999;"></iframe>