diff --git a/frontend/ui/bbox.lua b/frontend/ui/bbox.lua
new file mode 100644
index 000000000..1743a614f
--- /dev/null
+++ b/frontend/ui/bbox.lua
@@ -0,0 +1,150 @@
+--[[
+BBoxWidget shows a bbox for page cropping
+]]
+BBoxWidget = InputContainer:new{
+	page_bbox = nil,
+	screen_bbox = nil,
+	linesize = 2,
+}
+
+function BBoxWidget:getSize()
+	return Geom:new{
+		x = 0, y = 0,
+		w = Screen:getWidth(),
+		h = Screen:getHeight()
+	}
+end
+
+function BBoxWidget:paintTo(bb, x, y)
+	self.screen_bbox = self.screen_bbox or self:page_to_screen()
+	local bbox = self.screen_bbox
+	-- upper_left
+	bb:invertRect(bbox.x0 + self.linesize, bbox.y0, bbox.x1 - bbox.x0, self.linesize)
+	bb:invertRect(bbox.x0, bbox.y0, self.linesize, bbox.y1 - bbox.y0 + self.linesize)
+	-- bottom_right
+	bb:invertRect(bbox.x0 + self.linesize, bbox.y1, bbox.x1 - bbox.x0 - self.linesize, self.linesize)
+	bb:invertRect(bbox.x1, bbox.y0 + self.linesize, self.linesize, bbox.y1 - bbox.y0)
+end
+
+-- transform page bbox to screen bbox
+function BBoxWidget:page_to_screen()
+	local bbox = {}
+	local scale = self.crop.zoom
+	local screen_offset = self.crop.screen_offset
+	DEBUG("screen offset in page_to_screen", screen_offset)
+	bbox.x0 = self.page_bbox.x0 * scale + screen_offset.x
+	bbox.y0 = self.page_bbox.y0 * scale + screen_offset.y
+	bbox.x1 = self.page_bbox.x1 * scale + screen_offset.x
+	bbox.y1 = self.page_bbox.y1 * scale + screen_offset.y
+	return bbox
+end
+
+-- transform screen bbox to page bbox
+function BBoxWidget:screen_to_page()
+	local bbox = {}
+	local scale = self.crop.zoom
+	local screen_offset = self.crop.screen_offset
+	DEBUG("screen offset in screen_to_page", screen_offset)
+	bbox.x0 = self.screen_bbox.x0 / scale - screen_offset.x
+	bbox.y0 = self.screen_bbox.y0 / scale - screen_offset.y
+	bbox.x1 = self.screen_bbox.x1 / scale - screen_offset.x
+	bbox.y1 = self.screen_bbox.y1 / scale - screen_offset.y
+	return bbox
+end
+
+function BBoxWidget:oddEven(number)
+	if number % 2 == 1 then
+		return "odd"
+	else
+		return "even"
+	end
+end
+
+function BBoxWidget:init()
+	if Device:isTouchDevice() then
+		self.ges_events = {
+			AdjustCrop = {
+				GestureRange:new{
+					ges = "tap",
+					range = Geom:new{
+						x = 0, y = 0,
+						w = Screen:getWidth(),
+						h = Screen:getHeight()
+					}
+				}
+			},
+			ConfirmCrop = {
+				GestureRange:new{
+					ges = "double_tap",
+					range = Geom:new{
+						x = 0, y = 0,
+						w = Screen:getWidth(),
+						h = Screen:getHeight()
+					}
+				}
+			},
+			CancelCrop = {
+				GestureRange:new{
+					ges = "hold_release",
+					range = Geom:new{
+						x = 0, y = 0,
+						w = Screen:getWidth(),
+						h = Screen:getHeight()
+					}
+				}
+			},
+		}
+	end
+end
+
+function BBoxWidget:onGesture(ev)
+	for name, gsseq in pairs(self.ges_events) do
+		for _, gs_range in ipairs(gsseq) do
+			--DEBUG("gs_range", gs_range)
+			if gs_range:match(ev) then
+				local eventname = gsseq.event or name
+				return self:handleEvent(Event:new(eventname, ev.pos))
+			end
+		end
+	end
+end
+
+function BBoxWidget:onAdjustCrop(pos)
+	DEBUG("adjusting crop bbox with pos", pos)
+	local bbox = self.screen_bbox
+	local upper_left = Geom:new{ x = bbox.x0, y = bbox.y0}
+	local bottom_right = Geom:new{ x = bbox.x1, y = bbox.y1}
+	if upper_left:distance(pos) < bottom_right:distance(pos) then
+		upper_left.x = pos.x
+		upper_left.y = pos.y
+	else
+		bottom_right.x = pos.x
+		bottom_right.y = pos.y
+	end
+	self.screen_bbox = {
+		x0 = upper_left.x, 
+		y0 = upper_left.y,
+		x1 = bottom_right.x,
+		y1 = bottom_right.y
+	}
+	UIManager.repaint_all = true
+end
+
+function BBoxWidget:onConfirmCrop()
+	self.page_bbox = self:screen_to_page()
+	--DEBUG("new bbox", self.page_bbox)
+	UIManager:close(self)
+	self.ui:handleEvent(Event:new("BBoxUpdate"), self.page_bbox)
+	self.document.bbox[self.pageno] = self.page_bbox
+	self.document.bbox[self:oddEven(self.pageno)] = self.page_bbox
+	self.ui:handleEvent(Event:new("SetZoomMode", self.orig_zoom_mode))
+	self.document.configurable.text_wrap = self.orig_reflow_mode
+	UIManager.repaint_all = true
+end
+
+function BBoxWidget:onCancelCrop()
+	UIManager:close(self)
+	self.ui:handleEvent(Event:new("SetZoomMode", self.orig_zoom_mode))
+	self.document.configurable.text_wrap = self.orig_reflow_mode
+	UIManager.repaint_all = true
+end
diff --git a/frontend/ui/reader/readercropping.lua b/frontend/ui/reader/readercropping.lua
index fb0e530a9..2d0b694ba 100644
--- a/frontend/ui/reader/readercropping.lua
+++ b/frontend/ui/reader/readercropping.lua
@@ -1,153 +1,4 @@
---[[
-BBoxWidget shows a bbox for page cropping
-]]
-BBoxWidget = InputContainer:new{
-	page_bbox = nil,
-	screen_bbox = nil,
-	linesize = 2,
-}
-
-function BBoxWidget:getSize()
-	return Geom:new{
-		x = 0, y = 0,
-		w = Screen:getWidth(),
-		h = Screen:getHeight()
-	}
-end
-
-function BBoxWidget:paintTo(bb, x, y)
-	self.screen_bbox = self.screen_bbox or self:page_to_screen()
-	local bbox = self.screen_bbox
-	-- upper_left
-	bb:invertRect(bbox.x0 + self.linesize, bbox.y0, bbox.x1 - bbox.x0, self.linesize)
-	bb:invertRect(bbox.x0, bbox.y0, self.linesize, bbox.y1 - bbox.y0 + self.linesize)
-	-- bottom_right
-	bb:invertRect(bbox.x0 + self.linesize, bbox.y1, bbox.x1 - bbox.x0 - self.linesize, self.linesize)
-	bb:invertRect(bbox.x1, bbox.y0 + self.linesize, self.linesize, bbox.y1 - bbox.y0)
-end
-
--- transform page bbox to screen bbox
-function BBoxWidget:page_to_screen()
-	local bbox = {}
-	local scale = self.crop.zoom
-	local screen_offset = self.crop.screen_offset
-	DEBUG("screen offset in page_to_screen", screen_offset)
-	bbox.x0 = self.page_bbox.x0 * scale + screen_offset.x
-	bbox.y0 = self.page_bbox.y0 * scale + screen_offset.y
-	bbox.x1 = self.page_bbox.x1 * scale + screen_offset.x
-	bbox.y1 = self.page_bbox.y1 * scale + screen_offset.y
-	return bbox
-end
-
--- transform screen bbox to page bbox
-function BBoxWidget:screen_to_page()
-	local bbox = {}
-	local scale = self.crop.zoom
-	local screen_offset = self.crop.screen_offset
-	DEBUG("screen offset in screen_to_page", screen_offset)
-	bbox.x0 = self.screen_bbox.x0 / scale - screen_offset.x
-	bbox.y0 = self.screen_bbox.y0 / scale - screen_offset.y
-	bbox.x1 = self.screen_bbox.x1 / scale - screen_offset.x
-	bbox.y1 = self.screen_bbox.y1 / scale - screen_offset.y
-	return bbox
-end
-
-function BBoxWidget:oddEven(number)
-	if number % 2 == 1 then
-		return "odd"
-	else
-		return "even"
-	end
-end
-
-function BBoxWidget:init()
-	if Device:isTouchDevice() then
-		self.ges_events = {
-			AdjustCrop = {
-				GestureRange:new{
-					ges = "tap",
-					range = Geom:new{
-						x = 0, y = 0,
-						w = Screen:getWidth(),
-						h = Screen:getHeight()
-					}
-				}
-			},
-			ConfirmCrop = {
-				GestureRange:new{
-					ges = "double_tap",
-					range = Geom:new{
-						x = 0, y = 0,
-						w = Screen:getWidth(),
-						h = Screen:getHeight()
-					}
-				}
-			},
-			CancelCrop = {
-				GestureRange:new{
-					ges = "hold_release",
-					range = Geom:new{
-						x = 0, y = 0,
-						w = Screen:getWidth(),
-						h = Screen:getHeight()
-					}
-				}
-			},
-		}
-	end
-end
-
-function BBoxWidget:onGesture(ev)
-	for name, gsseq in pairs(self.ges_events) do
-		for _, gs_range in ipairs(gsseq) do
-			--DEBUG("gs_range", gs_range)
-			if gs_range:match(ev) then
-				local eventname = gsseq.event or name
-				return self:handleEvent(Event:new(eventname, ev.pos))
-			end
-		end
-	end
-end
-
-function BBoxWidget:onAdjustCrop(pos)
-	DEBUG("adjusting crop bbox with pos", pos)
-	local bbox = self.screen_bbox
-	local upper_left = Geom:new{ x = bbox.x0, y = bbox.y0}
-	local bottom_right = Geom:new{ x = bbox.x1, y = bbox.y1}
-	if upper_left:distance(pos) < bottom_right:distance(pos) then
-		upper_left.x = pos.x
-		upper_left.y = pos.y
-	else
-		bottom_right.x = pos.x
-		bottom_right.y = pos.y
-	end
-	self.screen_bbox = {
-		x0 = upper_left.x, 
-		y0 = upper_left.y,
-		x1 = bottom_right.x,
-		y1 = bottom_right.y
-	}
-	UIManager.repaint_all = true
-end
-
-function BBoxWidget:onConfirmCrop()
-	self.page_bbox = self:screen_to_page()
-	--DEBUG("new bbox", self.page_bbox)
-	UIManager:close(self)
-	self.ui:handleEvent(Event:new("BBoxUpdate"), self.page_bbox)
-	self.document.bbox[self.pageno] = self.page_bbox
-	self.document.bbox[self:oddEven(self.pageno)] = self.page_bbox
-	self.ui:handleEvent(Event:new("SetZoomMode", self.orig_zoom_mode))
-	self.document.configurable.text_wrap = self.orig_reflow_mode
-	UIManager.repaint_all = true
-end
-
-function BBoxWidget:onCancelCrop()
-	UIManager:close(self)
-	self.ui:handleEvent(Event:new("SetZoomMode", self.orig_zoom_mode))
-	self.document.configurable.text_wrap = self.orig_reflow_mode
-	UIManager.repaint_all = true
-end
+require "ui/bbox"
 
 ReaderCropping = InputContainer:new{}