diff --git a/resources/celerity/map.php b/resources/celerity/map.php
index 3aef57ca61..43c3f83408 100644
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -7,8 +7,8 @@
  */
 return array(
   'names' => array(
-    'core.pkg.css' => 'c7fc5aec',
-    'core.pkg.js' => '10275c16',
+    'core.pkg.css' => 'b9e2e1e5',
+    'core.pkg.js' => '80f86a0a',
     'darkconsole.pkg.js' => 'e7393ebb',
     'differential.pkg.css' => 'b3eea3f5',
     'differential.pkg.js' => '4b7d8f19',
@@ -18,7 +18,7 @@ return array(
     'maniphest.pkg.js' => '949a7498',
     'rsrc/css/aphront/aphront-bars.css' => '231ac33c',
     'rsrc/css/aphront/dark-console.css' => 'f54bf286',
-    'rsrc/css/aphront/dialog-view.css' => 'b4334e08',
+    'rsrc/css/aphront/dialog-view.css' => '913c172e',
     'rsrc/css/aphront/lightbox-attachment.css' => '7acac05d',
     'rsrc/css/aphront/list-filter-view.css' => '5d6f0526',
     'rsrc/css/aphront/multi-column.css' => 'fd18389d',
@@ -245,7 +245,7 @@ return array(
     'rsrc/externals/javelin/lib/URI.js' => 'c989ade3',
     'rsrc/externals/javelin/lib/Vector.js' => '2caa8fb8',
     'rsrc/externals/javelin/lib/WebSocket.js' => 'e292eaf4',
-    'rsrc/externals/javelin/lib/Workflow.js' => '0eb34d1d',
+    'rsrc/externals/javelin/lib/Workflow.js' => '1e911d0f',
     'rsrc/externals/javelin/lib/__tests__/Cookie.js' => '5ed109e8',
     'rsrc/externals/javelin/lib/__tests__/DOM.js' => 'c984504b',
     'rsrc/externals/javelin/lib/__tests__/JSON.js' => '837a7d68',
@@ -339,6 +339,7 @@ return array(
     'rsrc/image/people/washington.png' => '40dd301c',
     'rsrc/image/phrequent_active.png' => 'a466a8ed',
     'rsrc/image/phrequent_inactive.png' => 'bfc15a69',
+    'rsrc/image/resize.png' => 'fd476de4',
     'rsrc/image/sprite-login-X2.png' => 'e3991e37',
     'rsrc/image/sprite-login.png' => '03d5af29',
     'rsrc/image/sprite-menu-X2.png' => 'cfd8fca5',
@@ -530,7 +531,7 @@ return array(
     'almanac-css' => 'dbb9b3af',
     'aphront-bars' => '231ac33c',
     'aphront-dark-console-css' => 'f54bf286',
-    'aphront-dialog-view-css' => 'b4334e08',
+    'aphront-dialog-view-css' => '913c172e',
     'aphront-list-filter-view-css' => '5d6f0526',
     'aphront-multi-column-view-css' => 'fd18389d',
     'aphront-panel-view-css' => '8427b78d',
@@ -749,7 +750,7 @@ return array(
     'javelin-workboard-card' => 'c587b80f',
     'javelin-workboard-column' => 'bae58312',
     'javelin-workboard-controller' => '55baf5ed',
-    'javelin-workflow' => '0eb34d1d',
+    'javelin-workflow' => '1e911d0f',
     'lightbox-attachment-css' => '7acac05d',
     'maniphest-batch-editor' => 'b0f0b6d5',
     'maniphest-report-css' => '9b9580b7',
@@ -981,17 +982,6 @@ return array(
       'javelin-dom',
       'javelin-router',
     ),
-    '0eb34d1d' => array(
-      'javelin-stratcom',
-      'javelin-request',
-      'javelin-dom',
-      'javelin-vector',
-      'javelin-install',
-      'javelin-util',
-      'javelin-mask',
-      'javelin-uri',
-      'javelin-routable',
-    ),
     '0f764c35' => array(
       'javelin-install',
       'javelin-util',
@@ -1071,6 +1061,17 @@ return array(
       'javelin-dom',
       'javelin-reactor-dom',
     ),
+    '1e911d0f' => array(
+      'javelin-stratcom',
+      'javelin-request',
+      'javelin-dom',
+      'javelin-vector',
+      'javelin-install',
+      'javelin-util',
+      'javelin-mask',
+      'javelin-uri',
+      'javelin-routable',
+    ),
     '21ba5861' => array(
       'javelin-behavior',
       'javelin-dom',
diff --git a/src/applications/typeahead/controller/PhabricatorTypeaheadModularDatasourceController.php b/src/applications/typeahead/controller/PhabricatorTypeaheadModularDatasourceController.php
index 569b1d088e..fd1473aee9 100644
--- a/src/applications/typeahead/controller/PhabricatorTypeaheadModularDatasourceController.php
+++ b/src/applications/typeahead/controller/PhabricatorTypeaheadModularDatasourceController.php
@@ -250,6 +250,8 @@ final class PhabricatorTypeaheadModularDatasourceController
           ->setRenderDialogAsDiv(true)
           ->setTitle($source->getBrowseTitle())
           ->appendChild($browser)
+          ->setResizeX(true)
+          ->setResizeY($frame_id)
           ->addFooter($function_help)
           ->addCancelButton('/', pht('Close'));
       }
diff --git a/src/view/AphrontDialogView.php b/src/view/AphrontDialogView.php
index 218839ef6e..4616393813 100644
--- a/src/view/AphrontDialogView.php
+++ b/src/view/AphrontDialogView.php
@@ -24,6 +24,8 @@ final class AphrontDialogView
   private $flush;
   private $validationException;
   private $objectList;
+  private $resizeX;
+  private $resizeY;
 
 
   const WIDTH_DEFAULT = 'default';
@@ -72,6 +74,24 @@ final class AphrontDialogView
     return $this->shortTitle;
   }
 
+  public function setResizeY($resize_y) {
+    $this->resizeY = $resize_y;
+    return $this;
+  }
+
+  public function getResizeY() {
+    return $this->resizeY;
+  }
+
+  public function setResizeX($resize_x) {
+    $this->resizeX = $resize_x;
+    return $this;
+  }
+
+  public function getResizeX() {
+    return $this->resizeX;
+  }
+
   public function addSubmitButton($text = null) {
     if (!$text) {
       $text = pht('Okay');
@@ -347,6 +367,20 @@ final class AphrontDialogView
         $this->footers);
     }
 
+    $resize = null;
+    if ($this->resizeX || $this->resizeY) {
+      $resize = javelin_tag(
+        'div',
+        array(
+          'class' => 'aphront-dialog-resize',
+          'sigil' => 'jx-dialog-resize',
+          'meta' => array(
+            'resizeX' => $this->resizeX,
+            'resizeY' => $this->resizeY,
+          ),
+        ));
+    }
+
     $tail = null;
     if ($buttons || $footer) {
       $tail = phutil_tag(
@@ -357,6 +391,7 @@ final class AphrontDialogView
         array(
           $buttons,
           $footer,
+          $resize,
         ));
     }
 
diff --git a/webroot/rsrc/css/aphront/dialog-view.css b/webroot/rsrc/css/aphront/dialog-view.css
index 8909368beb..7328cda5ea 100644
--- a/webroot/rsrc/css/aphront/dialog-view.css
+++ b/webroot/rsrc/css/aphront/dialog-view.css
@@ -48,6 +48,7 @@
 
 .aphront-dialog-tail {
   border: none;
+  position: relative;
   background: {$lightgreybackground};
   padding: 8px 16px;
   border-top: 1px solid {$thinblueborder};
@@ -55,6 +56,23 @@
   border-bottom-right-radius: 3px;
 }
 
+.device .aphront-dialog-resize {
+  /* No resizing on devices. */
+  display: none;
+}
+
+.aphront-dialog-resize {
+  position: absolute;
+  right: -4px;
+  bottom: -4px;
+  width: 18px;
+  height: 18px;
+  background-image: url(/rsrc/image/resize.png);
+  background-size: 100%;
+  cursor: nwse-resize;
+  pointer-events: all;
+}
+
 .aphront-dialog-foot {
   padding: 6px 0;
   float: left;
diff --git a/webroot/rsrc/externals/javelin/lib/Workflow.js b/webroot/rsrc/externals/javelin/lib/Workflow.js
index 2ee7ef1ff0..7f0818d4e0 100644
--- a/webroot/rsrc/externals/javelin/lib/Workflow.js
+++ b/webroot/rsrc/externals/javelin/lib/Workflow.js
@@ -157,6 +157,80 @@ JX.install('Workflow', {
     _getActiveWorkflow : function() {
       var stack = JX.Workflow._stack;
       return stack[stack.length - 1];
+    },
+
+    _onresizestart: function(e) {
+      var self = JX.Workflow;
+      if (self._resizing) {
+        return;
+      }
+
+      var workflow = self._getActiveWorkflow();
+      if (!workflow) {
+        return;
+      }
+
+      e.kill();
+
+      var form = JX.DOM.find(workflow._root, 'div', 'jx-dialog');
+      var resize = e.getNodeData('jx-dialog-resize');
+      var node_y = JX.$(resize.resizeY);
+
+      var dim = JX.Vector.getDim(form);
+      dim.y = JX.Vector.getDim(node_y).y;
+
+      if (!form._minimumSize) {
+        form._minimumSize = dim;
+      }
+
+      self._resizing = {
+        min: form._minimumSize,
+        form: form,
+        startPos: JX.$V(e),
+        startDim: dim,
+        resizeY: node_y,
+        resizeX: resize.resizeX
+      };
+    },
+
+    _onmousemove: function(e) {
+      var self = JX.Workflow;
+      if (!self._resizing) {
+        return;
+      }
+
+      var spec = self._resizing;
+      var form = spec.form;
+      var min = spec.min;
+
+      var delta = JX.$V(e).add(-spec.startPos.x, -spec.startPos.y);
+      var src_dim = spec.startDim;
+      var dst_dim = JX.$V(src_dim.x + delta.x, src_dim.y + delta.y);
+
+      if (dst_dim.x < min.x) {
+        dst_dim.x = min.x;
+      }
+
+      if (dst_dim.y < min.y) {
+        dst_dim.y = min.y;
+      }
+
+      if (spec.resizeX) {
+        JX.$V(dst_dim.x, null).setDim(form);
+      }
+
+      if (spec.resizeY) {
+        JX.$V(null, dst_dim.y).setDim(spec.resizeY);
+      }
+    },
+
+    _onmouseup: function() {
+      var self = JX.Workflow;
+      if (!self._resizing) {
+        return;
+      }
+
+      self._resizing = false;
     }
   },
 
@@ -220,6 +294,12 @@ JX.install('Workflow', {
           [],
           JX.Workflow._onsyntheticsubmit);
 
+        JX.DOM.listen(
+          this._root,
+          'mousedown',
+          'jx-dialog-resize',
+          JX.Workflow._onresizestart);
+
         // Note that even in the presence of a content frame, we're doing
         // everything here at top level: dialogs are fully modal and cover
         // the entire window.
@@ -413,6 +493,9 @@ JX.install('Workflow', {
     }
 
     JX.Stratcom.listen('keydown', null, close_dialog_when_user_presses_escape);
+
+    JX.Stratcom.listen('mousemove', null, JX.Workflow._onmousemove);
+    JX.Stratcom.listen('mouseup', null, JX.Workflow._onmouseup);
   }
 
 });
diff --git a/webroot/rsrc/image/resize.png b/webroot/rsrc/image/resize.png
new file mode 100644
index 0000000000..da44a55cd1
Binary files /dev/null and b/webroot/rsrc/image/resize.png differ