diff --git a/doc/.azure-pipelines.yml b/doc/.azure-pipelines.yml
index 1d771b61330a..bb61614b0bd5 100644
--- a/doc/.azure-pipelines.yml
+++ b/doc/.azure-pipelines.yml
@@ -68,6 +68,7 @@ jobs:
           rm gdal-docs/gdal.pdf
           cp doc/build/latex/gdal.pdf gdal-docs
           cp data/gdalicon.png gdal-docs # For GDAL autotest...
+          cp -r resources gdal-docs # Do not change this without changing swig/python/gdal-utils/osgeo_utils/gdal2tiles.py
           cd gdal-docs
           wget http://download.osgeo.org/gdal/for_doc/javadoc.zip -O /tmp/javadoc.zip
           wget http://download.osgeo.org/gdal/for_doc/python-doc.tar.gz -O /tmp/python-doc.tar.gz
diff --git a/resources/gdal2tiles/none.png b/resources/gdal2tiles/none.png
new file mode 100644
index 000000000000..351bbc06ebd0
Binary files /dev/null and b/resources/gdal2tiles/none.png differ
diff --git a/resources/gdal2tiles/opacity-slider.png b/resources/gdal2tiles/opacity-slider.png
new file mode 100644
index 000000000000..87c7628917e2
Binary files /dev/null and b/resources/gdal2tiles/opacity-slider.png differ
diff --git a/swig/python/gdal-utils/osgeo_utils/gdal2tiles.py b/swig/python/gdal-utils/osgeo_utils/gdal2tiles.py
index 6e9e10527444..a7102c34db0d 100644
--- a/swig/python/gdal-utils/osgeo_utils/gdal2tiles.py
+++ b/swig/python/gdal-utils/osgeo_utils/gdal2tiles.py
@@ -11,8 +11,6 @@
 #           - support of global tiles (Spherical Mercator) for compatibility
 #               with interactive web maps a la Google Maps
 # Author:   Klokan Petr Pridal, klokan at klokan dot cz
-# Web:      http://www.klokan.cz/projects/gdal2tiles/
-# GUI:      http://www.maptiler.org/
 #
 ###############################################################################
 # Copyright (c) 2008, Klokan Petr Pridal
@@ -2357,7 +2355,6 @@ def generate_googlemaps(self) -> str:
 
                 /*
                  * Create a Custom Opacity GControl
-                 * http://www.maptiler.org/google-maps-overlay-opacity-control/
                  */
 
                 var CTransparencyLENGTH = 58;
@@ -2404,16 +2401,16 @@ def generate_googlemaps(self) -> str:
 
                     // Handle transparent PNG files in MSIE
                     if (this.ie) {
-                      var loader = "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='http://www.maptiler.org/img/opacity-slider.png', sizingMethod='crop');";
+                      var loader = "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='https://gdal.org/resources/gdal2tiles/opacity-slider.png', sizingMethod='crop');";
                       container.innerHTML = '<div style="height:21px; width:70px; ' +loader+ '" ></div>';
                     } else {
-                      container.innerHTML = '<div style="height:21px; width:70px; background-image: url(http://www.maptiler.org/img/opacity-slider.png)" ></div>';
+                      container.innerHTML = '<div style="height:21px; width:70px; background-image: url(https://gdal.org/resources/gdal2tiles/opacity-slider.png)" ></div>';
                     }
 
                     // create the knob as a GDraggableObject
                     // Handle transparent PNG files in MSIE
                     if (this.ie) {
-                      var loader = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='http://www.maptiler.org/img/opacity-slider.png', sizingMethod='crop');";
+                      var loader = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='https://gdal.org/resources/gdal2tiles/opacity-slider.png', sizingMethod='crop');";
                       this.knob = document.createElement("div");
                       this.knob.style.height="21px";
                       this.knob.style.width="13px";
@@ -2429,7 +2426,7 @@ def generate_googlemaps(self) -> str:
                       this.knob = document.createElement("div");
                       this.knob.style.height="21px";
                       this.knob.style.width="13px";
-                      this.knob.style.backgroundImage="url(http://www.maptiler.org/img/opacity-slider.png)";
+                      this.knob.style.backgroundImage="url(https://gdal.org/resources/gdal2tiles/opacity-slider.png)";
                       this.knob.style.backgroundPosition="-70px 0px";
                     }
                     container.appendChild(this.knob);
@@ -2522,7 +2519,7 @@ def generate_googlemaps(self) -> str:
                       var mercator = new GMercatorProjection(mapMaxZoom+1);
                       tilelayer.getTileUrl = function(tile,zoom) {
                           if ((zoom < mapMinZoom) || (zoom > mapMaxZoom)) {
-                              return "http://www.maptiler.org/img/none.png";
+                              return "https://gdal.org/resources/gdal2tiles/none.png";
                           }
                           var ymax = 1 << zoom;
                           var y = ymax - tile.y -1;
@@ -2533,7 +2530,7 @@ def generate_googlemaps(self) -> str:
                           if (mapBounds.intersects(tileBounds)) {
                               return zoom+"/"+tile.x+"/"+y+".png";
                           } else {
-                              return "http://www.maptiler.org/img/none.png";
+                              return "https://gdal.org/resources/gdal2tiles/none.png";
                           }
                       }
                       // IE 7-: support for PNG alpha channel
@@ -2593,7 +2590,7 @@ def generate_googlemaps(self) -> str:
               </head>
               <body onload="load()">
                   <div id="header"><h1>%(xml_escaped_title)s</h1></div>
-                  <div id="subheader">Generated by <a href="http://www.klokan.cz/projects/gdal2tiles/">GDAL2Tiles</a>, Copyright &copy; 2008 <a href="http://www.klokan.cz/">Klokan Petr Pridal</a>,  <a href="http://www.gdal.org/">GDAL</a> &amp; <a href="http://www.osgeo.org/">OSGeo</a> <a href="http://code.google.com/soc/">GSoC</a>
+                  <div id="subheader">Generated by <a href="https://gdal.org/programs/gdal2tiles.html">GDAL2Tiles</a>, Copyright &copy; 2008 <a href="http://www.klokan.cz/">Klokan Petr Pridal</a>,  <a href="https://gdal.org">GDAL</a> &amp; <a href="http://www.osgeo.org/">OSGeo</a> <a href="http://code.google.com/soc/">GSoC</a>
             <!-- PLEASE, LET THIS NOTE ABOUT AUTHOR AND PROJECT SOMEWHERE ON YOUR WEBSITE, OR AT LEAST IN THE COMMENT IN HTML. THANK YOU -->
                   </div>
                    <div id="map"></div>
@@ -2711,7 +2708,7 @@ def generate_leaflet(self) -> str:
         title.addTo(map);
 
         // Note
-        var src = 'Generated by <a href="http://www.klokan.cz/projects/gdal2tiles/">GDAL2Tiles</a>, Copyright &copy; 2008 <a href="http://www.klokan.cz/">Klokan Petr Pridal</a>,  <a href="http://www.gdal.org/">GDAL</a> &amp; <a href="http://www.osgeo.org/">OSGeo</a> <a href="http://code.google.com/soc/">GSoC</a>';
+        var src = 'Generated by <a href="https://gdal.org/programs/gdal2tiles.html">GDAL2Tiles</a>, Copyright &copy; 2008 <a href="http://www.klokan.cz/">Klokan Petr Pridal</a>,  <a href="https://gdal.org">GDAL</a> &amp; <a href="http://www.osgeo.org/">OSGeo</a> <a href="http://code.google.com/soc/">GSoC</a>';
         var title = L.control({position: 'bottomleft'});
         title.onAdd = function(map) {
             this._div = L.DomUtil.create('div', 'ctl src');