diff --git a/main/exercise/exercise.class.php b/main/exercise/exercise.class.php
index d59363d139..e5adc5c845 100755
--- a/main/exercise/exercise.class.php
+++ b/main/exercise/exercise.class.php
@@ -6403,19 +6403,14 @@ class Exercise
         }
 
         $signature = '';
-        /*if (api_get_configuration_value('')) {
-            $extraFieldValue = new ExtraFieldValue('exercise');
-            $result = $extraFieldValue->get_values_by_handler_and_field_variable($objExercise->iId, 'signature_activated');
-            if ($result && isset($result['value']) && 1 === (int) $result['value']) {
-                $allowSignature = true;
-            }
-            $signature
-        }*/
+        if (ExerciseSignaturePlugin::exerciseHasSignatureActivated($this)) {
+            $signature = ExerciseSignaturePlugin::getSignature($trackExerciseInfo['exe_user_id'], $trackExerciseInfo);
+        }
 
         $tpl = new Template(null, false, false, false, false, false, false);
         $tpl->assign('data', $data);
         $tpl->assign('allow_signature', $allowSignature);
-        //$tpl->assign('signature', $signature);
+        $tpl->assign('signature', $signature);
         $tpl->assign('allow_export_pdf', $allowExportPdf);
         $tpl->assign('export_url', api_get_path(WEB_CODE_PATH).'exercise/result.php?action=export&id='.$exeId.'&'.api_get_cidreq());
 
diff --git a/main/exercise/exercise_result.php b/main/exercise/exercise_result.php
index fc2e9086a3..06cb536faa 100755
--- a/main/exercise/exercise_result.php
+++ b/main/exercise/exercise_result.php
@@ -119,14 +119,7 @@ $logInfo = [
 ];
 Event::registerLog($logInfo);
 
-$allowSignature = false;
-if ('true' === api_get_plugin_setting('exercise_signature', 'tool_enable')) {
-    $extraFieldValue = new ExtraFieldValue('exercise');
-    $result = $extraFieldValue->get_values_by_handler_and_field_variable($objExercise->iId, 'signature_activated');
-    if ($result && isset($result['value']) && 1 === (int) $result['value']) {
-        $allowSignature = true;
-    }
-}
+$allowSignature = ExerciseSignaturePlugin::exerciseHasSignatureActivated($objExercise);
 if ($allowSignature) {
     $htmlHeadXtra[] = api_get_asset('signature_pad/signature_pad.umd.js');
 }
diff --git a/main/exercise/exercise_show.php b/main/exercise/exercise_show.php
index 31c1657ada..8f6b9d534b 100755
--- a/main/exercise/exercise_show.php
+++ b/main/exercise/exercise_show.php
@@ -845,7 +845,7 @@ foreach ($questionList as $questionId) {
     $contents = ob_get_clean();
     $question_content = '<div class="question_row">';
     if ($show_results && $objQuestionTmp) {
-        $objQuestionTmp->export = $action == 'export';
+        $objQuestionTmp->export = $action === 'export';
         // Shows question title an description
         $question_content .= $objQuestionTmp->return_header(
             $objExercise,
@@ -913,10 +913,7 @@ if (!empty($category_list) && ($show_results || $show_only_total_score || $showT
         'score' => $myTotalScoreTemp,
         'total' => $totalWeighting,
     ];
-    echo TestCategory::get_stats_table_by_attempt(
-        $objExercise->id,
-        $category_list
-    );
+    echo TestCategory::get_stats_table_by_attempt($objExercise->id, $category_list);
 }
 
 if (in_array(
@@ -1051,7 +1048,6 @@ if ($isFeedbackAllowed && $origin !== 'learnpath' && $origin !== 'student_progre
         $url
     );
     $emailForm->setDefaults(['notification_content' => $content]);
-
     $emailForm->addButtonSend(
         get_lang('CorrectTest'),
         'submit',
diff --git a/main/exercise/result.php b/main/exercise/result.php
index 5e7fb74a49..ac38761de6 100755
--- a/main/exercise/result.php
+++ b/main/exercise/result.php
@@ -57,15 +57,11 @@ if (!$is_allowedToEdit) {
 }
 
 $allowSignature = false;
-if ($student_id === $current_user_id && 'true' === api_get_plugin_setting('exercise_signature', 'tool_enable')) {
-    $extraFieldValue = new ExtraFieldValue('exercise');
-    $result = $extraFieldValue->get_values_by_handler_and_field_variable($exercise_id, 'signature_activated');
-    if ($result && isset($result['value']) && 1 === (int) $result['value']) {
-        // Check if signature exists.
-        $signature = ExerciseSignaturePlugin::getSignature($current_user_id, $track_exercise_info);
-        if (false === $signature) {
-            $allowSignature = true;
-        }
+if ($student_id === $current_user_id && ExerciseSignaturePlugin::exerciseHasSignatureActivated($objExercise)) {
+    // Check if signature exists.
+    $signature = ExerciseSignaturePlugin::getSignature($current_user_id, $track_exercise_info);
+    if (false === $signature) {
+        $allowSignature = true;
     }
 }
 
diff --git a/main/inc/ajax/exercise.ajax.php b/main/inc/ajax/exercise.ajax.php
index a8acf6aefb..6da422d476 100755
--- a/main/inc/ajax/exercise.ajax.php
+++ b/main/inc/ajax/exercise.ajax.php
@@ -919,11 +919,14 @@ switch ($action) {
         if ('true' !== api_get_plugin_setting('exercise_signature', 'tool_enable')) {
             exit;
         }
+
         $file = isset($_REQUEST['file']) ? $_REQUEST['file'] : '';
         if (empty($exeId) || empty($file)) {
             echo 0;
             exit;
         }
+
+        $file = str_replace(' ', '+', $file);
         $track = ExerciseLib::get_exercise_track_exercise_info($exeId);
         if ($track) {
             $result = ExerciseSignaturePlugin::saveSignature($currentUserId, $track, $file);
diff --git a/main/template/default/exercise/partials/result_exercise.tpl b/main/template/default/exercise/partials/result_exercise.tpl
index 5aa966903b..b3fdbb8a96 100644
--- a/main/template/default/exercise/partials/result_exercise.tpl
+++ b/main/template/default/exercise/partials/result_exercise.tpl
@@ -13,7 +13,11 @@
                         <img src="{{ data.avatar }}">
                     </div>
                     <div class="user-info">
-                        <strong>{{ data.name_url }}</strong><br>
+                        <strong>{{ data.name_url }}</strong>
+                        <br />
+                        {% if signature %}
+                            <img src="{{ signature }}" />
+                        {% endif %}
                     </div>
                 </div>
                 <div class="col-md-9">
diff --git a/main/template/default/exercise/result.tpl b/main/template/default/exercise/result.tpl
index ea2408a3e4..91cecf5d87 100644
--- a/main/template/default/exercise/result.tpl
+++ b/main/template/default/exercise/result.tpl
@@ -29,9 +29,10 @@
     </div>
 
     <script>
+        var imageFormat = 'image/png';
         var canvas = document.querySelector("canvas");
         var signaturePad = new SignaturePad(canvas);
-        var dataURL = signaturePad.toDataURL("image/jpeg");
+        var dataURL = signaturePad.toDataURL(imageFormat);
         var url = "{{ _p.web_ajax }}exercise.ajax.php?{{ _p.web_cid_query }}";
         var exeId = "{{ exe_id }}";
 
@@ -54,10 +55,8 @@
                     return false;
                 }
 
-                var dataURL = signaturePad.toDataURL("image/jpeg");
-
+                var dataURL = signaturePad.toDataURL(imageFormat);
                 $.ajax({
-                    contentType: "application/x-www-form-urlencoded",
                     beforeSend: function(result) {
                         $('#loading').show();
                     },
diff --git a/plugin/exercise_signature/lib/ExerciseSignature.php b/plugin/exercise_signature/lib/ExerciseSignature.php
index b6c4db5348..56c29a45aa 100644
--- a/plugin/exercise_signature/lib/ExerciseSignature.php
+++ b/plugin/exercise_signature/lib/ExerciseSignature.php
@@ -26,6 +26,24 @@ class ExerciseSignaturePlugin extends Plugin
         return $instance ? $instance : $instance = new self();
     }
 
+    public static function exerciseHasSignatureActivated(Exercise $exercise)
+    {
+        if (empty($exercise->iId)) {
+            return false;
+        }
+
+        if ('true' === api_get_plugin_setting('exercise_signature', 'tool_enable')) {
+            $extraFieldValue = new ExtraFieldValue('exercise');
+            $result = $extraFieldValue->get_values_by_handler_and_field_variable($exercise->iId, 'signature_activated');
+            if ($result && isset($result['value']) && 1 === (int) $result['value']) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+
     public static function saveSignature($userId, $trackInfo, $file)
     {
         if (false === self::validateSignatureAccess($userId, $trackInfo)) {