diff --git a/src/Form/FillPdfFormForm.php b/src/Form/FillPdfFormForm.php
index 92b9532..a23344f 100644
--- a/src/Form/FillPdfFormForm.php
+++ b/src/Form/FillPdfFormForm.php
@@ -123,8 +123,9 @@ class FillPdfFormForm extends ContentEntityForm {
       ],
       'upload_pdf' => [
         '#type' => 'file',
-        '#title' => 'Update PDF template',
-        '#description' => $this->t('Update the PDF template used by this form'),
+        '#title' => $this->t('Update PDF template'),
+        '#attributes' => ['accept' => 'application/pdf'],
+        '#description' => $this->t('Update the PDF file used as template by this form.'),
         '#weight' => $pdf_info_weight++,
       ],
       'sample_populate' => [
diff --git a/src/Form/FillPdfOverviewForm.php b/src/Form/FillPdfOverviewForm.php
index 4f60aee..d309f6a 100644
--- a/src/Form/FillPdfOverviewForm.php
+++ b/src/Form/FillPdfOverviewForm.php
@@ -96,8 +96,9 @@ class FillPdfOverviewForm extends FillPdfAdminFormBase {
       if ($config->get('backend') !== 'fillpdf_service' || $this->moduleHandler->moduleExists('xmlrpc')) {
         $form['upload_pdf'] = [
           '#type' => 'file',
-          '#title' => 'Upload',
-          '#description' => $this->t('Upload a PDF template to create a new form'),
+          '#title' => $this->t('Upload PDF template'),
+          '#attributes' => ['accept' => 'application/pdf'],
+          '#description' => $this->t('Upload a fillable PDF file to create a new form.'),
         ];
 
         $form['submit'] = [