diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8be7a1e..70f17c4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 ### Next release ###
 
 #### Features ####
+*   Added ability to set paper_size via a driver setter (Philippe Lehoux)
 
 #### Bug fixes ####
 
diff --git a/lib/capybara/poltergeist/browser.rb b/lib/capybara/poltergeist/browser.rb
index 067de1b..014c20e 100644
--- a/lib/capybara/poltergeist/browser.rb
+++ b/lib/capybara/poltergeist/browser.rb
@@ -171,6 +171,10 @@ module Capybara::Poltergeist
       command 'render_base64', format.to_s, !!options[:full], options[:selector]
     end
 
+    def set_paper_size(size)
+      command 'set_paper_size', size
+    end
+
     def resize(width, height)
       command 'resize', width, height
     end
diff --git a/lib/capybara/poltergeist/client/browser.coffee b/lib/capybara/poltergeist/client/browser.coffee
index ee5cb00..38e6fec 100644
--- a/lib/capybara/poltergeist/client/browser.coffee
+++ b/lib/capybara/poltergeist/client/browser.coffee
@@ -277,6 +277,10 @@ class Poltergeist.Browser
     @page.setClipRect(rect)
     dimensions
 
+  set_paper_size: (size) ->
+    @page.setPaperSize(size)
+    this.sendResponse(true)
+
   resize: (width, height) ->
     @page.setViewportSize(width: width, height: height)
     this.sendResponse(true)
diff --git a/lib/capybara/poltergeist/client/compiled/browser.js b/lib/capybara/poltergeist/client/compiled/browser.js
index 37da809..92d73a3 100644
--- a/lib/capybara/poltergeist/client/compiled/browser.js
+++ b/lib/capybara/poltergeist/client/compiled/browser.js
@@ -371,6 +371,11 @@ Poltergeist.Browser = (function() {
     return dimensions;
   };
 
+  Browser.prototype.set_paper_size = function(size) {
+    this.page.setPaperSize(size);
+    return this.sendResponse(true);
+  };
+
   Browser.prototype.resize = function(width, height) {
     this.page.setViewportSize({
       width: width,
diff --git a/lib/capybara/poltergeist/client/compiled/web_page.js b/lib/capybara/poltergeist/client/compiled/web_page.js
index 35f9c8b..7a9fc53 100644
--- a/lib/capybara/poltergeist/client/compiled/web_page.js
+++ b/lib/capybara/poltergeist/client/compiled/web_page.js
@@ -198,6 +198,10 @@ Poltergeist.WebPage = (function() {
     return this["native"].viewportSize = size;
   };
 
+  WebPage.prototype.setPaperSize = function(size) {
+    return this["native"].paperSize = size;
+  };
+
   WebPage.prototype.scrollPosition = function() {
     return this["native"].scrollPosition;
   };
diff --git a/lib/capybara/poltergeist/client/web_page.coffee b/lib/capybara/poltergeist/client/web_page.coffee
index 0315a15..7bd445a 100644
--- a/lib/capybara/poltergeist/client/web_page.coffee
+++ b/lib/capybara/poltergeist/client/web_page.coffee
@@ -132,6 +132,9 @@ class Poltergeist.WebPage
   setViewportSize: (size) ->
     @native.viewportSize = size
 
+  setPaperSize: (size) ->
+    @native.paperSize = size
+
   scrollPosition: ->
     @native.scrollPosition
 
diff --git a/lib/capybara/poltergeist/driver.rb b/lib/capybara/poltergeist/driver.rb
index e9a5678..b76bcd6 100644
--- a/lib/capybara/poltergeist/driver.rb
+++ b/lib/capybara/poltergeist/driver.rb
@@ -161,6 +161,10 @@ module Capybara::Poltergeist
       browser.render_base64(format, options)
     end
 
+    def paper_size=(size = {})
+      browser.set_paper_size(size)
+    end
+
     def resize(width, height)
       browser.resize(width, height)
     end
diff --git a/poltergeist.gemspec b/poltergeist.gemspec
index ef86d08..1c4bcf1 100644
--- a/poltergeist.gemspec
+++ b/poltergeist.gemspec
@@ -25,6 +25,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'sinatra',            '~> 1.0'
   s.add_development_dependency 'rake',               '~> 10.0'
   s.add_development_dependency 'image_size',         '~> 1.0'
+  s.add_development_dependency 'pdf-reader',         '~> 1.3.3'
   s.add_development_dependency 'coffee-script',      '~> 2.2.0'
   s.add_development_dependency 'guard-coffeescript', '~> 1.0.0'
   s.add_development_dependency 'rspec-rerun',        '~> 0.1'
diff --git a/spec/integration/driver_spec.rb b/spec/integration/driver_spec.rb
index 70700c1..49cac54 100644
--- a/spec/integration/driver_spec.rb
+++ b/spec/integration/driver_spec.rb
@@ -1,5 +1,6 @@
 require 'spec_helper'
 require 'image_size'
+require 'pdf/reader'
 
 module Capybara::Poltergeist
   describe Driver do
@@ -180,6 +181,24 @@ module Capybara::Poltergeist
         expect(File.exist?(file)).to be_true
       end
 
+      context 'when #paper_size= is set' do
+        let(:format) { :pdf }
+
+        it 'changes pdf size' do
+          @session.visit('/poltergeist/long_page')
+          @driver.paper_size = { width: '1in', height: '1in' }
+
+          @driver.save_screenshot(file)
+
+          reader = PDF::Reader.new(file)
+          reader.pages.each do |page|
+            bbox   = page.attributes[:MediaBox]
+            width  = (bbox[2] - bbox[0]) / 72
+            expect(width).to eq(1)
+          end
+        end
+      end
+
       include_examples 'render screen'
     end