diff -u b/src/DiffEntityComparison.php b/src/DiffEntityComparison.php
--- b/src/DiffEntityComparison.php
+++ b/src/DiffEntityComparison.php
@@ -151,8 +151,8 @@
     for ($delta = 0; $delta < $max; $delta++) {
       if (isset($left_values[$delta])) {
         $value = $left_values[$delta];
-        if (isset($value['thumbnail'])) {
-          $result['#left_thumbnail'] = $value['thumbnail'];
+        if (isset($value['#thumbnail'])) {
+          $result['#left_thumbnail'][] = $value['#thumbnail'];
         }
         else {
           $result['#left'][] = is_array($value) ? implode("\n", $value) : $value;
@@ -160,8 +160,8 @@
       }
       if (isset($right_values[$delta])) {
         $value = $right_values[$delta];
-        if (isset($value['thumbnail'])) {
-          $result['#right_thumbnail'] = $value['thumbnail'];
+        if (isset($value['#thumbnail'])) {
+          $result['#right_thumbnail'][] = $value['#thumbnail'];
         }
         else {
           $result['#right'][] = is_array($value) ? implode("\n", $value) : $value;
diff -u b/src/Plugin/diff/Field/ImageFieldBuilder.php b/src/Plugin/diff/Field/ImageFieldBuilder.php
--- b/src/Plugin/diff/Field/ImageFieldBuilder.php
+++ b/src/Plugin/diff/Field/ImageFieldBuilder.php
@@ -58,17 +58,19 @@
         $separator = $this->configuration['property_separator'] == 'nl' ? "\n" : $this->configuration['property_separator'];
         $result[$field_key] = implode($separator, $result[$field_key]);
 
-        if (isset($values['target_id'])) {
-          $image = $fileManager->load($values['target_id']);
-          $image_style[$field_key]['thumbnail'] = array(
-            '#theme' => 'image_style',
-            '#uri' => $image->getFileUri(),
-            '#width' => 300,
-            '#height' => 300,
-            '#style_name' => 'thumbnail',
-            '#alt' => 'alt',
-          );
-          $result = array_merge($result, $image_style);
+        if ($this->configuration['compare_alt_field']) {
+          if (isset($values['target_id'])) {
+            $image = $fileManager->load($values['target_id']);
+            $image_style[$field_key]['#thumbnail'] = array(
+              '#theme' => 'image_style',
+              '#uri' => $image->getFileUri(),
+              '#width' => 300,
+              '#height' => 300,
+              '#style_name' => 'thumbnail',
+              '#alt' => 'alt',
+            );
+            $result = array_merge($result, $image_style);
+          }
         }
       }
     }
@@ -109,6 +111,12 @@
         'nl' => $this->t('New line'),
       ),
     );
+    $form['show_thumbnail'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Show image thumbnail'),
+      '#default_value' => $this->configuration['show_thumbnail'],
+      '#description' => $this->t('Displays the image field as thumbnail.'),
+    ];
 
     return parent::buildConfigurationForm($form, $form_state);
   }
@@ -121,6 +129,7 @@
     $this->configuration['compare_alt_field'] = $form_state->getValue('compare_alt_field');
     $this->configuration['compare_title_field'] = $form_state->getValue('compare_title_field');
     $this->configuration['property_separator'] = $form_state->getValue('property_separator');
+    $this->configuration['show_thumbnail'] = $form_state->getValue('show_thumbnail');
 
     parent::submitConfigurationForm($form, $form_state);
   }
@@ -134,6 +143,7 @@
       'compare_alt_field' => 1,
       'compare_title_field' => 1,
       'property_separator' => 'nl',
+      'show_thumbnail' => 1,
     );
     $default_configuration += parent::defaultConfiguration();
 
diff -u b/src/Plugin/diff/Layout/SplitFieldsDiffLayout.php b/src/Plugin/diff/Layout/SplitFieldsDiffLayout.php
--- b/src/Plugin/diff/Layout/SplitFieldsDiffLayout.php
+++ b/src/Plugin/diff/Layout/SplitFieldsDiffLayout.php
@@ -148,13 +148,13 @@
       );
 
       if (isset($field['#data']['#left_thumbnail'])) {
-        $field_diff_rows['thumbnail'][1] = [
+        $field_diff_rows['#thumbnail'][1] = [
           'data' => $field['#data']['#left_thumbnail'],
           'class' => '',
         ];
       }
       if (isset($field['#data']['#right_thumbnail'])) {
-        $field_diff_rows['thumbnail'][3] = [
+        $field_diff_rows['#thumbnail'][3] = [
           'data' => $field['#data']['#right_thumbnail'],
           'class' => '',
         ];