diff --git a/src/applications/pholio/view/PholioMockImagesView.php b/src/applications/pholio/view/PholioMockImagesView.php
--- a/src/applications/pholio/view/PholioMockImagesView.php
+++ b/src/applications/pholio/view/PholioMockImagesView.php
@@ -118,12 +118,11 @@
       'logInLink' => (string) $login_uri,
       'navsequence' => $navsequence,
       'fullIcon' => id(new PHUIIconView())->setIconFont('fa-arrows-alt'),
+      'rawIcon' => id(new PHUIIconView())->setIconFont('fa-file-image-o'),
       'downloadIcon' => id(new PHUIIconView())->setIconFont('fa-download'),
     );
     Javelin::initBehavior('pholio-mock-view', $config);
 
-    $mockview = '';
-
     $mock_wrapper = javelin_tag(
       'div',
       array(
@@ -162,15 +161,15 @@
       ),
       '');
 
-    $mockview[] = phutil_tag(
+    $mockview = phutil_tag(
       'div',
-        array(
-          'class' => 'pholio-mock-image-container',
-          'id' => 'pholio-mock-image-container'
-        ),
-      array($mock_wrapper, $inline_comments_holder));
+      array(
+        'class' => 'pholio-mock-image-container',
+        'id' => 'pholio-mock-image-container'
+      ),
+      $mock_wrapper);
 
-    return $mockview;
+    return array($mockview, $inline_comments_holder);
   }
 
   private function getImagePageURI(PholioImage $image, PholioMock $mock) {
diff --git a/webroot/rsrc/css/application/pholio/pholio.css b/webroot/rsrc/css/application/pholio/pholio.css
--- a/webroot/rsrc/css/application/pholio/pholio.css
+++ b/webroot/rsrc/css/application/pholio/pholio.css
@@ -205,3 +205,8 @@
   padding: 12px;
   border-top: 1px solid {$lightblueborder};
 }
+
+.jx-fullscreen {
+  width: 100%;
+  height: 100%;
+}
diff --git a/webroot/rsrc/js/application/pholio/behavior-pholio-mock-view.js b/webroot/rsrc/js/application/pholio/behavior-pholio-mock-view.js
--- a/webroot/rsrc/js/application/pholio/behavior-pholio-mock-view.js
+++ b/webroot/rsrc/js/application/pholio/behavior-pholio-mock-view.js
@@ -12,6 +12,7 @@
  *           javelin-mask
  *           javelin-behavior-device
  *           phabricator-keyboard-shortcut
+ *           phabricator-fullscreen
  */
 JX.behavior('pholio-mock-view', function(config) {
   var is_dragging = false;
@@ -586,6 +587,11 @@
 /* -(  Render  )------------------------------------------------------------- */
 
 
+  JX.Stratcom.listen('click', 'pholio-fullscreen', function(e) {
+    e.kill();
+    JX.Fullscreen.startFullscreen(JX.$('pholio-mock-image-container'));
+  });
+
   function render_image_info(image) {
     var info = [];
 
@@ -604,7 +610,7 @@
             target: '_blank',
             className: 'pholio-image-button-link'
           },
-          JX.$H(config.fullIcon))));
+          JX.$H(config.rawIcon))));
 
     // TODO: This should be a form which performs the download; for now, it
     // just takes the user to the info page.
@@ -622,6 +628,21 @@
           },
           JX.$H(config.downloadIcon))));
 
+    buttons.push(
+      JX.$N(
+        'div',
+        {
+          className: 'pholio-image-button'
+        },
+        JX.$N(
+          'a',
+          {
+            href: '#',
+            className: 'pholio-image-button-link',
+            sigil: 'pholio-fullscreen'
+          },
+          JX.$H(config.fullIcon))));
+
     var title = JX.$N(
       'div',
       {className: 'pholio-image-title'},
diff --git a/webroot/rsrc/js/core/Fullscreen.js b/webroot/rsrc/js/core/Fullscreen.js
new file mode 100644
--- /dev/null
+++ b/webroot/rsrc/js/core/Fullscreen.js
@@ -0,0 +1,99 @@
+/**
+ * @requires javelin-install
+ *           javelin-dom
+ *           javelin-stratcom
+ *           javelin-util
+ * @provides phabricator-fullscreen
+ * @javelin
+ */
+
+JX.install('Fullscreen', {
+
+  statics: {
+    _element: null,
+    _installed: false,
+
+    isAvailable: function() {
+      var self = JX.Fullscreen;
+      return !!self._getStartFunction(document.documentElement);
+    },
+
+    isFullscreen: function() {
+      var self = JX.Fullscreen;
+      return !!self._element;
+    },
+
+    startFullscreen: function(node) {
+      var self = JX.Fullscreen;
+      if (!self.isAvailable()) {
+        return;
+      }
+
+      if (self._element) {
+        return;
+      }
+
+      if (!self._installed) {
+        self._install();
+        self._installed = true;
+      }
+
+      self._element = node;
+      JX.DOM.alterClass(self._element, 'jx-fullscreen', true);
+
+      self._getStartFunction(node)();
+    },
+
+    stopFullscreen: function() {
+      var self = JX.Fullscreen;
+
+      if (!self._element) {
+        return;
+      }
+
+      JX.DOM.alterClass(self._element, 'jx-fullscreen', false);
+      self._element = null;
+
+      var fn = document.exitFullscreen ||
+               document.msExitFullscreen ||
+               document.mozCancelFullScreen ||
+               document.webkitRequestFullscreen;
+
+      fn.call(document);
+    },
+
+    _install: function() {
+      var self = JX.Fullscreen;
+      JX.Stratcom.listen('keydown', null, self._onkey);
+    },
+
+    _getStartFunction: function(node) {
+      var fn = node.requestFullscreen ||
+               node.msRequestFullscreen ||
+               node.mozRequestFullScreen ||
+               node.webkitRequestFullscreen;
+
+      if (!fn) {
+        return null;
+      }
+
+      return JX.bind(node, fn);
+    },
+
+    _onkey: function(e) {
+      var self = JX.Fullscreen;
+
+      if (!self.isFullscreen()) {
+        return;
+      }
+
+      if (e.getSpecialKey() != 'esc') {
+        return;
+      }
+
+      self.stopFullscreen();
+      e.kill();
+    }
+
+  }
+});