diff --git a/src/calibre/gui2/dialogs/metadata_bulk.py b/src/calibre/gui2/dialogs/metadata_bulk.py
index 788c8681a6..2a7db38ee9 100644
--- a/src/calibre/gui2/dialogs/metadata_bulk.py
+++ b/src/calibre/gui2/dialogs/metadata_bulk.py
@@ -151,6 +151,9 @@ class MetadataBulkDialog(QDialog, Ui_MetadataBulkDialog):
                     new_authors = string_to_authors(title)
                     self.db.set_authors(id, new_authors, notify=False)
 
+            if self.remove_conversion_settings.isChecked():
+                self.db.delete_conversion_options(id, 'PIPE')
+
             self.changed = True
         for w in getattr(self, 'custom_column_widgets', []):
             w.commit(self.ids)
diff --git a/src/calibre/gui2/dialogs/metadata_bulk.ui b/src/calibre/gui2/dialogs/metadata_bulk.ui
index a69c02dbc4..f5084fd883 100644
--- a/src/calibre/gui2/dialogs/metadata_bulk.ui
+++ b/src/calibre/gui2/dialogs/metadata_bulk.ui
@@ -253,7 +253,7 @@
            </property>
           </widget>
          </item>
-         <item row="10" column="0" colspan="2">
+         <item row="11" column="0" colspan="2">
           <widget class="QCheckBox" name="swap_title_and_author">
            <property name="text">
             <string>&amp;Swap title and author</string>
@@ -273,6 +273,18 @@ Book A will have series number 1 and Book B series number 2.</string>
            </property>
           </widget>
          </item>
+         <item row="10" column="0" colspan="2">
+          <widget class="QCheckBox" name="remove_conversion_settings">
+           <property name="toolTip">
+            <string>Remove stored conversion settings for the selected books.
+
+Future conversion of these books will use the default settings.</string>
+           </property>
+           <property name="text">
+            <string>Remove &amp;stored conversion settings for the selected books</string>
+           </property>
+          </widget>
+         </item>
         </layout>
        </widget>
        <widget class="QWidget" name="tab">
diff --git a/src/calibre/gui2/library.py b/src/calibre/gui2/library.py
index 9ba58963c4..896624c966 100644
--- a/src/calibre/gui2/library.py
+++ b/src/calibre/gui2/library.py
@@ -11,8 +11,8 @@ from PyQt4.QtGui import QTableView, QAbstractItemView, QColor, \
                         QPainterPath, QLinearGradient, QBrush, \
                         QPen, QStyle, QPainter, QStyleOptionViewItemV4, \
                         QIcon, QImage, QMenu, QSpinBox, QDoubleSpinBox, \
-                        QStyledItemDelegate, QCompleter, QIntValidator, \
-                        QDoubleValidator, QComboBox
+                        QStyledItemDelegate, QCompleter, \
+                        QComboBox
 from PyQt4.QtCore import QAbstractTableModel, QVariant, Qt, pyqtSignal, \
                          SIGNAL, QObject, QSize, QModelIndex, QDate