diff --git a/src/calibre/gui2/viewer/gestures.py b/src/calibre/gui2/viewer/gestures.py
index 1ac75320d7..0f3e9b1f16 100644
--- a/src/calibre/gui2/viewer/gestures.py
+++ b/src/calibre/gui2/viewer/gestures.py
@@ -29,9 +29,12 @@ SWIPE_HOLD_INTERVAL = 0.5  # seconds
 HOLD_THRESHOLD = 1.0  # seconds
 TAP_THRESHOLD  = 50   # manhattan pixels
 SWIPE_DISTANCE = 100  # manhattan pixels
+PINCH_CENTER_THRESHOLD = 150  # manhattan pixels
+PINCH_SQUEEZE_FACTOR = 2.5  # smaller length must be less that larger length / squeeze factor
 
 Tap, TapAndHold, Pinch, Swipe, SwipeAndHold = 'Tap', 'TapAndHold', 'Pinch', 'Swipe', 'SwipeAndHold'
 Left, Right, Up, Down = 'Left', 'Right', 'Up', 'Down'
+In, Out = 'In', 'Out'
 
 class TouchPoint(object):
 
@@ -65,10 +68,24 @@ class TouchPoint(object):
         axis = (Left, Right) if xabs > yabs else (Up, Down)
         return axis[0 if d < 0 else 1]
 
+def get_pinch(p1, p2):
+    starts = [p1.start_screen_position, p2.start_screen_position]
+    ends = [p1.current_screen_position, p2.current_screen_position]
+    start_center = (starts[0] + starts[1]) / 2.0
+    end_center = (ends[0] + ends[1]) / 2.0
+    if (start_center - end_center).manhattanLength() > PINCH_CENTER_THRESHOLD:
+        return None
+    start_length = (starts[0] - starts[1]).manhattanLength()
+    end_length = (ends[0] - ends[1]).manhattanLength()
+    if min(start_length, end_length) > max(start_length, end_length) / PINCH_SQUEEZE_FACTOR:
+        return None
+    return In if start_length > end_length else Out
+
 class State(QObject):
 
     tapped = pyqtSignal(object)
     swiped = pyqtSignal(object)
+    pinched = pyqtSignal(object)
     tap_hold_started = pyqtSignal(object)
     tap_hold_updated = pyqtSignal(object)
     swipe_hold_started = pyqtSignal(object)
@@ -156,7 +173,11 @@ class State(QObject):
                 return
 
         if Pinch in self.possible_gestures:
-            pass  # TODO: Implement this
+            points = tuple(self.touch_points.itervalues())
+            if len(points) == 2:
+                pinch_dir = get_pinch(*points)
+                if pinch_dir is not None:
+                    self.pinched.emit(pinch_dir)
 
         if TapAndHold in self.possible_gestures:
             tp = next(self.touch_points.itervalues())
@@ -182,6 +203,7 @@ class GestureHandler(QObject):
         self.state.swipe_hold_started.connect(partial(self.handle_swipe_hold, 'start'))
         self.state.swipe_hold_updated.connect(partial(self.handle_swipe_hold, 'update'))
         self.state.swipe_hold_finished.connect(partial(self.handle_swipe_hold, 'end'))
+        self.state.pinched.connect(self.handle_pinch)
         self.evmap = {QEvent.TouchBegin: 'start', QEvent.TouchUpdate: 'update', QEvent.TouchEnd: 'end'}
 
         # Ignore fake mouse events generated by the window system from touch
@@ -287,3 +309,7 @@ class GestureHandler(QObject):
         elif action == 'end':
             self.last_swipe_hold_update = None
 
+    def handle_pinch(self, direction):
+        attr = 'magnify' if direction is Out else 'shrink'
+        getattr(self.parent(), '%s_fonts' % attr)()
+