diff --git a/angular_app/import-persons.html b/angular_app/import-persons.html
index e94d014..3f22ea0 100644
--- a/angular_app/import-persons.html
+++ b/angular_app/import-persons.html
@@ -19,8 +19,16 @@
                     </select>
                 </div>
 
-                <input type="submit" value="{{'Import' | translate}}" ng-click="upload(file, '/ebcsvpersons')" />
+                <input type="checkbox" ng-model="deduplicate"> {{'deduplicate entries' | translate}}
 
+                <div>
+                    <br />
+                    <input type="submit" value="{{'Import' | translate}}" ng-click="upload(file, '/ebcsvpersons')" />
+                </div>
+
+                <div class="form-group top5">
+                    <uib-progressbar class="progress-striped" ng-class="{active: progressbarType == 'warning'}" max="100" value="progress" type="progressbarType">{{progress}}%</uib-progressbar>
+                </div>
                 <div class="form-group top5">
                     Result: total: <span>{{reply.total}}</span> valid: <span>{{reply.valid}}</span> new: <span>{{reply.new_in_event}}</span>
                 </div>
diff --git a/angular_app/js/controllers.js b/angular_app/js/controllers.js
index 4facb25..e0be19d 100644
--- a/angular_app/js/controllers.js
+++ b/angular_app/js/controllers.js
@@ -771,19 +771,26 @@ eventManControllers.controller('UsersCtrl', ['$scope', '$rootScope', '$state', '
 eventManControllers.controller('FileUploadCtrl', ['$scope', '$log', '$upload', 'Event',
     function ($scope, $log, $upload, Event) {
         $scope.file = null;
+        $scope.progress = 0;
+        $scope.progressbarType = 'warning';
+        $scope.deduplicate = false;
         $scope.reply = {};
         $scope.events = Event.all();
         $scope.upload = function(file, url) {
             $log.debug("FileUploadCtrl.upload");
+            $scope.progress = 0;
+            $scope.progressbarType = 'warning';
             $upload.upload({
                 url: url,
                 file: file,
-                fields: {targetEvent: $scope.targetEvent}
+                fields: {targetEvent: $scope.targetEvent, deduplicate: $scope.deduplicate}
             }).progress(function(evt) {
-                var progressPercentage = parseInt(100.0 * evt.loaded / evt.total);
-                $log.debug('progress: ' + progressPercentage + '%');
+                $scope.progress = parseInt(100.0 * evt.loaded / evt.total);
+                $log.debug('progress: ' + $scope.progress + '%');
             }).success(function(data, status, headers, config) {
                 $scope.file = null;
+                $scope.progress = 100;
+                $scope.progressbarType = 'success';
                 $scope.reply = angular.fromJson(data);
             });
         };
diff --git a/eventman_server.py b/eventman_server.py
index 331acda..69f25be 100755
--- a/eventman_server.py
+++ b/eventman_server.py
@@ -1034,20 +1034,25 @@ class EbCSVImportPersonsHandler(BaseHandler):
         event_handler.db = self.db
         event_handler.logger = self.logger
         event_id = None
+        deduplicate = False
         try:
             event_id = self.get_body_argument('targetEvent')
         except:
             pass
+        try:
+            deduplicate = self.tobool(self.get_body_argument('deduplicate'))
+        except:
+            pass
         if event_id is None:
             return self.build_error('invalid event')
         reply = dict(total=0, valid=0, merged=0, new_in_event=0)
         event_details = event_handler.db.query('events', {'_id': event_id})
         if not event_details:
             return self.build_error('invalid event')
-        all_emails = set()
+        all_persons = set()
         #[x.get('email') for x in (event_details[0].get('tickets') or []) if x.get('email')])
         for ticket in (event_details[0].get('tickets') or []):
-            all_emails.add('%s_%s_%s' % (ticket.get('name'), ticket.get('surname'), ticket.get('email')))
+            all_persons.add('%s_%s_%s' % (ticket.get('name'), ticket.get('surname'), ticket.get('email')))
         for fieldname, contents in self.request.files.items():
             for content in contents:
                 filename = content['filename']
@@ -1060,10 +1065,12 @@ class EbCSVImportPersonsHandler(BaseHandler):
                     person['attended'] = False
                     person['from_file'] = filename
                     self.add_access_info(person)
-                    duplicate_check = '%s_%s_%s' % (person.get('name'), person.get('surname'), person.get('email'))
-                    if duplicate_check in all_emails:
-                        continue
-                    all_emails.add(duplicate_check)
+                    if deduplicate:
+                        duplicate_check = '%s_%s_%s_%s' % (person.get('name'), person.get('surname'),
+                                                           person.get('email'), person.get('order_nr'))
+                        if duplicate_check in all_persons:
+                            continue
+                        all_persons.add(duplicate_check)
                     event_handler.handle_post_tickets(event_id, None, person)
                     reply['new_in_event'] += 1
         self.write(reply)