diff --git a/css/60_photos.css b/css/60_photos.css
index d1e84d79c..d7f4adff5 100644
--- a/css/60_photos.css
+++ b/css/60_photos.css
@@ -12,11 +12,46 @@
     border-radius: 0;
     padding: 5px;
     position: absolute;
-    right: 0;
-    top: 0;
-    z-index: 48;
+    right: 5px;
+    top: 5px;
+    z-index: 50;
 }
 
+#photoviewer button.resize-handle-xy {
+    border-radius: 0;
+    position: absolute;
+    top: 0;
+    right: 0;
+    z-index: 49;
+    cursor: nesw-resize;
+    height: 10px;
+    width: 10px;
+}
+
+#photoviewer button.resize-handle-x {
+    border-radius: 0;
+    position: absolute;
+    top: 0;
+    right: 0;
+    bottom: 0;
+    z-index: 48;
+    cursor: ew-resize;
+    height: auto;
+    width: 5px;
+}
+
+#photoviewer button.resize-handle-y {
+    border-radius: 0;
+    position: absolute;
+    top: 0;
+    right: 0;
+    z-index: 48;
+    cursor: ns-resize;
+    height: 5px;
+    width: 100%;
+}
+
+
 .photo-wrapper,
 .photo-wrapper img {
     width: 100%;
diff --git a/modules/services/mapillary.js b/modules/services/mapillary.js
index baed207b8..01aefaae2 100644
--- a/modules/services/mapillary.js
+++ b/modules/services/mapillary.js
@@ -431,6 +431,13 @@ export default {
         // load mapillary signs sprite
         var defs = context.container().select('defs');
         defs.call(svgDefs(context).addSprites, ['mapillary-sprite']);
+
+        // Register viewer resize handler
+        context.ui().on('photoviewerResize', function() {
+            if (_mlyViewer) {
+                _mlyViewer.resize();
+            }
+        });
     },
 
 
diff --git a/modules/ui/init.js b/modules/ui/init.js
index 7e1d134fc..e196d507f 100644
--- a/modules/ui/init.js
+++ b/modules/ui/init.js
@@ -2,6 +2,7 @@ import {
     event as d3_event,
     select as d3_select
 } from 'd3-selection';
+import { dispatch as d3_dispatch } from 'd3-dispatch';
 
 import { d3keybinding as d3_keybinding } from '../lib/d3.keybinding.js';
 
@@ -13,6 +14,7 @@ import { modeBrowse } from '../modes';
 import { services } from '../services';
 import { svgDefs, svgIcon } from '../svg';
 import { utilGetDimensions } from '../util/dimensions';
+import { utilRebind } from '../util';
 
 import { uiAccount } from './account';
 import { uiAttribution } from './attribution';
@@ -42,9 +44,46 @@ import { uiVersion } from './version';
 import { uiZoom } from './zoom';
 import { uiCmd } from './cmd';
 
+function buildResizeListener(target, eventName, dispatch, options) {
+    var resizeOnX = !!options.resizeOnX;
+    var resizeOnY = !!options.resizeOnY;
+    var startX;
+    var startY;
+    var startWidth;
+    var startHeight;
+
+    function startResize() {
+        if (resizeOnX) {
+            target.style('width', (startWidth + d3_event.clientX - startX) + 'px');
+        }
+
+        if (resizeOnY) {
+            target.style('height', (startHeight + startY - d3_event.clientY) + 'px');
+        }
+
+        dispatch.call(eventName, target);
+    }
+
+    function stopResize() {
+        d3_select(window)
+            .on('.' + eventName, null);
+    }
+
+    return function initResize() {
+        startX = d3_event.clientX;
+        startY = d3_event.clientY;
+        startWidth = target.node().getBoundingClientRect().width;
+        startHeight = target.node().getBoundingClientRect().height;
+
+        d3_select(window)
+            .on('mousemove.' + eventName, startResize, false)
+            .on('mouseup.' + eventName, stopResize, false);
+    };
+}
 
 export function uiInit(context) {
     var uiInitCounter = 0;
+    var dispatch = d3_dispatch('photoviewerResize');
 
 
     function render(container) {
@@ -256,6 +295,29 @@ export function uiInit(context) {
             .append('div')
             .call(svgIcon('#iD-icon-close'));
 
+        photoviewer
+            .append('button')
+            .attr('class', 'resize-handle-xy')
+            .on(
+                'mousedown',
+                buildResizeListener(photoviewer, 'photoviewerResize', dispatch, { resizeOnX: true, resizeOnY: true })
+            );
+
+        photoviewer
+            .append('button')
+            .attr('class', 'resize-handle-x')
+            .on(
+                'mousedown',
+                buildResizeListener(photoviewer, 'photoviewerResize', dispatch, { resizeOnX: true })
+            );
+
+        photoviewer
+            .append('button')
+            .attr('class', 'resize-handle-y')
+            .on(
+                'mousedown',
+                buildResizeListener(photoviewer, 'photoviewerResize', dispatch, { resizeOnY: true })
+            );
 
         window.onbeforeunload = function() {
             return context.save();
@@ -370,5 +432,5 @@ export function uiInit(context) {
 
     ui.sidebar = uiSidebar(context);
 
-    return ui;
+    return utilRebind(ui, dispatch, 'on');
 }