diff --git a/src/calibre/gui2/tweak_book/boss.py b/src/calibre/gui2/tweak_book/boss.py
index c1f36621c8..976780dd77 100644
--- a/src/calibre/gui2/tweak_book/boss.py
+++ b/src/calibre/gui2/tweak_book/boss.py
@@ -18,7 +18,7 @@ from calibre import prints, isbytestring
 from calibre.ptempfile import PersistentTemporaryDirectory, TemporaryDirectory
 from calibre.ebooks.oeb.base import urlnormalize
 from calibre.ebooks.oeb.polish.main import SUPPORTED, tweak_polish
-from calibre.ebooks.oeb.polish.container import get_container as _gc, clone_container, guess_type, OEB_FONTS
+from calibre.ebooks.oeb.polish.container import get_container as _gc, clone_container, guess_type, OEB_FONTS, OEB_DOCS, OEB_STYLES
 from calibre.ebooks.oeb.polish.cover import mark_as_cover, mark_as_titlepage
 from calibre.ebooks.oeb.polish.css import filter_css
 from calibre.ebooks.oeb.polish.pretty import fix_all_html, pretty_all
@@ -677,11 +677,21 @@ class Boss(QObject):
 
     def filter_css(self):
         self.commit_all_editors_to_container()
-        d = FilterCSS(parent=self.gui)
+        c = current_container()
+        ed = self.gui.central.current_editor
+        for name, q in editors.iteritems():
+            if ed is q:
+                current_name = name
+                break
+        else:
+            current_name = None
+        if current_name and c.mime_map[current_name] not in OEB_DOCS | OEB_STYLES:
+            current_name = None
+        d = FilterCSS(current_name=current_name, parent=self.gui)
         if d.exec_() == d.Accepted and d.filtered_properties:
             self.add_savepoint(_('Before: Filter style information'))
             with BusyCursor():
-                changed = filter_css(current_container(), d.filtered_properties)
+                changed = filter_css(current_container(), d.filtered_properties, names=d.filter_names)
             if changed:
                 self.apply_container_update_to_gui()
                 self.show_current_diff()
diff --git a/src/calibre/gui2/tweak_book/widgets.py b/src/calibre/gui2/tweak_book/widgets.py
index d82ea589e1..fc50c53b71 100644
--- a/src/calibre/gui2/tweak_book/widgets.py
+++ b/src/calibre/gui2/tweak_book/widgets.py
@@ -926,7 +926,8 @@ class InsertSemantics(Dialog):
 
 class FilterCSS(Dialog):  # {{{
 
-    def __init__(self, parent=None):
+    def __init__(self, current_name=None, parent=None):
+        self.current_name = current_name
         Dialog.__init__(self, _('Filter Style Information'), 'filter-css', parent=parent)
 
     def setup_ui(self):
@@ -951,8 +952,18 @@ class FilterCSS(Dialog):  # {{{
         l.addRow(_('&Other CSS properties:'), o)
         o.setToolTip(f.filter_css_others.toolTip())
 
+        if self.current_name is not None:
+            self.filter_current = c = QCheckBox(_('Only filter CSS in the current file (%s)') % self.current_name)
+            l.addRow(c)
+
         l.addRow(self.bb)
 
+    @property
+    def filter_names(self):
+        if self.current_name is not None and self.filter_current.isChecked():
+            return (self.current_name,)
+        return ()
+
     @property
     def filtered_properties(self):
         ans = set()