diff --git a/examples/wms-custom-proj.js b/examples/wms-custom-proj.js
index 87c7d6d7d1..5857831e85 100644
--- a/examples/wms-custom-proj.js
+++ b/examples/wms-custom-proj.js
@@ -18,7 +18,7 @@ var projection = ol.proj.configureProj4jsProjection({
 var extent = [420000, 30000, 900000, 350000];
 var layers = [
   new ol.layer.Tile({
-    source: new ol.source.TileWMS({
+    source: new ol.source.TileWMS(/** @type {olx.source.TileWMSOptions} */ ({
       url: 'http://wms.geo.admin.ch/',
       crossOrigin: 'anonymous',
       attributions: [new ol.Attribution({
@@ -31,11 +31,12 @@ var layers = [
         'LAYERS': 'ch.swisstopo.pixelkarte-farbe-pk1000.noscale',
         'FORMAT': 'image/jpeg'
       },
-      extent: extent
-    })
+      extent: extent,
+      serverType: 'mapserver'
+    }))
   }),
   new ol.layer.Tile({
-    source: new ol.source.TileWMS({
+    source: new ol.source.TileWMS(/** @type {olx.source.TileWMSOptions} */ ({
       url: 'http://wms.geo.admin.ch/',
       crossOrigin: 'anonymous',
       attributions: [new ol.Attribution({
@@ -45,8 +46,9 @@ var layers = [
             'National parks / geo.admin.ch</a>'
       })],
       params: {'LAYERS': 'ch.bafu.schutzgebiete-paerke_nationaler_bedeutung'},
-      extent: extent
-    })
+      extent: extent,
+      serverType: 'mapserver'
+    }))
   })
 ];
 
diff --git a/examples/wms-tiled.js b/examples/wms-tiled.js
index b5315579b4..e6c0bc048c 100644
--- a/examples/wms-tiled.js
+++ b/examples/wms-tiled.js
@@ -11,11 +11,12 @@ var layers = [
     source: new ol.source.MapQuest({layer: 'sat'})
   }),
   new ol.layer.Tile({
-    source: new ol.source.TileWMS({
+    source: new ol.source.TileWMS(/** @type {olx.source.TileWMSOptions} */ ({
       url: 'http://demo.opengeo.org/geoserver/wms',
       params: {'LAYERS': 'topp:states', 'TILED': true},
-      extent: [-13884991, 2870341, -7455066, 6338219]
-    })
+      extent: [-13884991, 2870341, -7455066, 6338219],
+      serverType: 'geoserver'
+    }))
   })
 ];
 var map = new ol.Map({
diff --git a/src/objectliterals.jsdoc b/src/objectliterals.jsdoc
index 55ad47473a..ff886b03c1 100644
--- a/src/objectliterals.jsdoc
+++ b/src/objectliterals.jsdoc
@@ -755,10 +755,15 @@
  *     edges" issues by properly configuring the WMS service. For example, MapServer
  *     has a `tile_map_edge_buffer` configuration parameter for this. See
  *     http://mapserver.org/output/tile_mode.html.
+ * @property {boolean|undefined} hidpi Use the `ol.Map#pixelRatio` value when
+ *     requesting the image from the remote server. Default is `true`.
  * @property {string|undefined} logo Logo.
  * @property {ol.tilegrid.TileGrid|undefined} tileGrid Tile grid.
  * @property {number|undefined} maxZoom Maximum zoom.
  * @property {ol.proj.ProjectionLike} projection Projection.
+ * @property {ol.source.wms.ServerType|undefined} serverType The type of the remote WMS
+ *     server: `mapserver`, `geoserver` or `qgis`. Only needed if `hidpi` is `true`.
+ *     Default is `undefined`.
  * @property {ol.TileLoadFunctionType|undefined} tileLoadFunction Optional
  *     function to load a tile given a URL.
  * @property {string|undefined} url WMS service URL.
diff --git a/src/ol/renderer/canvas/canvastilelayerrenderer.js b/src/ol/renderer/canvas/canvastilelayerrenderer.js
index 64aca68b02..a1bfffce45 100644
--- a/src/ol/renderer/canvas/canvastilelayerrenderer.js
+++ b/src/ol/renderer/canvas/canvastilelayerrenderer.js
@@ -164,6 +164,7 @@ ol.renderer.canvas.TileLayer.prototype.prepareFrame =
   //   composition and positioning.
   //
 
+  var pixelRatio = frameState.pixelRatio;
   var view2DState = frameState.view2DState;
   var projection = view2DState.projection;
 
@@ -171,14 +172,14 @@ ol.renderer.canvas.TileLayer.prototype.prepareFrame =
   goog.asserts.assertInstanceof(tileLayer, ol.layer.Tile);
   var tileSource = tileLayer.getSource();
   goog.asserts.assertInstanceof(tileSource, ol.source.Tile);
-  var tileGrid = tileSource.getTileGrid();
-  if (goog.isNull(tileGrid)) {
-    tileGrid = ol.tilegrid.getForProjection(projection);
-  }
+  var tileGrid = tileSource.getTileGridForProjection(projection);
   var tileGutter = tileSource.getGutter();
   var z = tileGrid.getZForResolution(view2DState.resolution);
-  var tileSize = tileGrid.getTileSize(z);
+  var tilePixelSize =
+      tileSource.getTilePixelSize(z, frameState.pixelRatio, projection);
+  var tilePixelRatio = tilePixelSize / tileGrid.getTileSize(z);
   var tileResolution = tileGrid.getResolution(z);
+  var tilePixelResolution = tileResolution / tilePixelRatio;
   var center = view2DState.center;
   var extent;
   if (tileResolution == view2DState.resolution) {
@@ -191,8 +192,8 @@ ol.renderer.canvas.TileLayer.prototype.prepareFrame =
   var tileRange = tileGrid.getTileRangeForExtentAndResolution(
       extent, tileResolution);
 
-  var canvasWidth = tileSize * tileRange.getWidth();
-  var canvasHeight = tileSize * tileRange.getHeight();
+  var canvasWidth = tilePixelSize * tileRange.getWidth();
+  var canvasHeight = tilePixelSize * tileRange.getHeight();
 
   var canvas, context;
   if (goog.isNull(this.canvas_)) {
@@ -231,8 +232,8 @@ ol.renderer.canvas.TileLayer.prototype.prepareFrame =
 
   var canvasTileRange, canvasTileRangeWidth, minX, minY;
   if (goog.isNull(this.renderedCanvasTileRange_)) {
-    canvasTileRangeWidth = canvasWidth / tileSize;
-    var canvasTileRangeHeight = canvasHeight / tileSize;
+    canvasTileRangeWidth = canvasWidth / tilePixelSize;
+    var canvasTileRangeHeight = canvasHeight / tilePixelSize;
     minX = tileRange.minX -
         Math.floor((canvasTileRangeWidth - tileRange.getWidth()) / 2);
     minY = tileRange.minY -
@@ -261,7 +262,7 @@ ol.renderer.canvas.TileLayer.prototype.prepareFrame =
 
   var getTileIfLoaded = this.createGetTileIfLoadedFunction(function(tile) {
     return !goog.isNull(tile) && tile.getState() == ol.TileState.LOADED;
-  }, tileSource, projection);
+  }, tileSource, pixelRatio, projection);
   var findLoadedTiles = goog.bind(tileSource.findLoadedTiles, tileSource,
       tilesToDrawByZ, getTileIfLoaded);
 
@@ -271,7 +272,7 @@ ol.renderer.canvas.TileLayer.prototype.prepareFrame =
   for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
     for (y = tileRange.minY; y <= tileRange.maxY; ++y) {
 
-      tile = tileSource.getTile(z, x, y, projection);
+      tile = tileSource.getTile(z, x, y, pixelRatio, projection);
       tileState = tile.getState();
       if (tileState == ol.TileState.LOADED ||
           tileState == ol.TileState.EMPTY ||
@@ -299,9 +300,9 @@ ol.renderer.canvas.TileLayer.prototype.prepareFrame =
   var i, ii;
   for (i = 0, ii = tilesToClear.length; i < ii; ++i) {
     tile = tilesToClear[i];
-    x = tileSize * (tile.tileCoord.x - canvasTileRange.minX);
-    y = tileSize * (canvasTileRange.maxY - tile.tileCoord.y);
-    context.clearRect(x, y, tileSize, tileSize);
+    x = tilePixelSize * (tile.tileCoord.x - canvasTileRange.minX);
+    y = tilePixelSize * (canvasTileRange.maxY - tile.tileCoord.y);
+    context.clearRect(x, y, tilePixelSize, tilePixelSize);
   }
 
   /** @type {Array.<number>} */
@@ -316,7 +317,8 @@ ol.renderer.canvas.TileLayer.prototype.prepareFrame =
   var height, width;
   for (i = 0, ii = zs.length; i < ii; ++i) {
     currentZ = zs[i];
-    tileSize = tileGrid.getTileSize(currentZ);
+    tilePixelSize =
+        tileSource.getTilePixelSize(currentZ, pixelRatio, projection);
     tilesToDraw = tilesToDrawByZ[currentZ];
     if (currentZ == z) {
       for (tileCoordKey in tilesToDraw) {
@@ -325,18 +327,18 @@ ol.renderer.canvas.TileLayer.prototype.prepareFrame =
             (tile.tileCoord.y - canvasTileRange.minY) * canvasTileRangeWidth +
             (tile.tileCoord.x - canvasTileRange.minX);
         if (this.renderedTiles_[index] != tile) {
-          x = tileSize * (tile.tileCoord.x - canvasTileRange.minX);
-          y = tileSize * (canvasTileRange.maxY - tile.tileCoord.y);
+          x = tilePixelSize * (tile.tileCoord.x - canvasTileRange.minX);
+          y = tilePixelSize * (canvasTileRange.maxY - tile.tileCoord.y);
           tileState = tile.getState();
           if (tileState == ol.TileState.EMPTY ||
               tileState == ol.TileState.ERROR ||
               !opaque) {
-            context.clearRect(x, y, tileSize, tileSize);
+            context.clearRect(x, y, tilePixelSize, tilePixelSize);
           }
           if (tileState == ol.TileState.LOADED) {
             context.drawImage(tile.getImage(),
-                tileGutter, tileGutter, tileSize, tileSize,
-                x, y, tileSize, tileSize);
+                tileGutter, tileGutter, tilePixelSize, tilePixelSize,
+                x, y, tilePixelSize, tilePixelSize);
           }
           this.renderedTiles_[index] = tile;
         }
@@ -346,17 +348,17 @@ ol.renderer.canvas.TileLayer.prototype.prepareFrame =
       for (tileCoordKey in tilesToDraw) {
         tile = tilesToDraw[tileCoordKey];
         tileExtent = tileGrid.getTileCoordExtent(tile.tileCoord, tmpExtent);
-        x = (tileExtent[0] - origin[0]) / tileResolution;
-        y = (origin[1] - tileExtent[3]) / tileResolution;
-        width = scale * tileSize;
-        height = scale * tileSize;
+        x = (tileExtent[0] - origin[0]) / tilePixelResolution;
+        y = (origin[1] - tileExtent[3]) / tilePixelResolution;
+        width = scale * tilePixelSize;
+        height = scale * tilePixelSize;
         tileState = tile.getState();
         if (tileState == ol.TileState.EMPTY || !opaque) {
           context.clearRect(x, y, width, height);
         }
         if (tileState == ol.TileState.LOADED) {
           context.drawImage(tile.getImage(),
-              tileGutter, tileGutter, tileSize, tileSize,
+              tileGutter, tileGutter, tilePixelSize, tilePixelSize,
               x, y, width, height);
         }
         interimTileRange =
@@ -377,19 +379,18 @@ ol.renderer.canvas.TileLayer.prototype.prepareFrame =
   }
 
   this.updateUsedTiles(frameState.usedTiles, tileSource, z, tileRange);
-  this.manageTilePyramid(frameState, tileSource, tileGrid, projection, extent,
-      z, tileLayer.getPreload());
+  this.manageTilePyramid(frameState, tileSource, tileGrid, pixelRatio,
+      projection, extent, z, tileLayer.getPreload());
   this.scheduleExpireCache(frameState, tileSource);
   this.updateLogos(frameState, tileSource);
 
-  var pixelRatio = frameState.pixelRatio;
   ol.vec.Mat4.makeTransform2D(this.imageTransform_,
       pixelRatio * frameState.size[0] / 2,
       pixelRatio * frameState.size[1] / 2,
-      pixelRatio * tileResolution / view2DState.resolution,
-      pixelRatio * tileResolution / view2DState.resolution,
+      pixelRatio * tilePixelResolution / view2DState.resolution,
+      pixelRatio * tilePixelResolution / view2DState.resolution,
       view2DState.rotation,
-      (origin[0] - center[0]) / tileResolution,
-      (center[1] - origin[1]) / tileResolution);
+      (origin[0] - center[0]) / tilePixelResolution,
+      (center[1] - origin[1]) / tilePixelResolution);
 
 };
diff --git a/src/ol/renderer/dom/domtilelayerrenderer.js b/src/ol/renderer/dom/domtilelayerrenderer.js
index a2c7c1ec13..a2b9974a16 100644
--- a/src/ol/renderer/dom/domtilelayerrenderer.js
+++ b/src/ol/renderer/dom/domtilelayerrenderer.js
@@ -81,6 +81,7 @@ ol.renderer.dom.TileLayer.prototype.prepareFrame =
     return;
   }
 
+  var pixelRatio = frameState.pixelRatio;
   var view2DState = frameState.view2DState;
   var projection = view2DState.projection;
 
@@ -88,10 +89,7 @@ ol.renderer.dom.TileLayer.prototype.prepareFrame =
   goog.asserts.assertInstanceof(tileLayer, ol.layer.Tile);
   var tileSource = tileLayer.getSource();
   goog.asserts.assertInstanceof(tileSource, ol.source.Tile);
-  var tileGrid = tileSource.getTileGrid();
-  if (goog.isNull(tileGrid)) {
-    tileGrid = ol.tilegrid.getForProjection(projection);
-  }
+  var tileGrid = tileSource.getTileGridForProjection(projection);
   var tileGutter = tileSource.getGutter();
   var z = tileGrid.getZForResolution(view2DState.resolution);
   var tileResolution = tileGrid.getResolution(z);
@@ -113,7 +111,7 @@ ol.renderer.dom.TileLayer.prototype.prepareFrame =
 
   var getTileIfLoaded = this.createGetTileIfLoadedFunction(function(tile) {
     return !goog.isNull(tile) && tile.getState() == ol.TileState.LOADED;
-  }, tileSource, projection);
+  }, tileSource, pixelRatio, projection);
   var findLoadedTiles = goog.bind(tileSource.findLoadedTiles, tileSource,
       tilesToDrawByZ, getTileIfLoaded);
 
@@ -123,7 +121,7 @@ ol.renderer.dom.TileLayer.prototype.prepareFrame =
   for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
     for (y = tileRange.minY; y <= tileRange.maxY; ++y) {
 
-      tile = tileSource.getTile(z, x, y, projection);
+      tile = tileSource.getTile(z, x, y, pixelRatio, projection);
       tileState = tile.getState();
       if (tileState == ol.TileState.LOADED) {
         tilesToDrawByZ[z][tile.tileCoord.toString()] = tile;
@@ -241,8 +239,8 @@ ol.renderer.dom.TileLayer.prototype.prepareFrame =
   }
 
   this.updateUsedTiles(frameState.usedTiles, tileSource, z, tileRange);
-  this.manageTilePyramid(frameState, tileSource, tileGrid, projection, extent,
-      z, tileLayer.getPreload());
+  this.manageTilePyramid(frameState, tileSource, tileGrid, pixelRatio,
+      projection, extent, z, tileLayer.getPreload());
   this.scheduleExpireCache(frameState, tileSource);
   this.updateLogos(frameState, tileSource);
 
@@ -339,8 +337,12 @@ ol.renderer.dom.TileLayerZ_.prototype.addTile = function(tile, tileGutter) {
     imageStyle.position = 'absolute';
     imageStyle.left = -tileGutter + 'px';
     imageStyle.top = -tileGutter + 'px';
+    imageStyle.width = (tileSize + 2 * tileGutter) + 'px';
+    imageStyle.height = (tileSize + 2 * tileGutter) + 'px';
     goog.dom.appendChild(tileElement, image);
   } else {
+    imageStyle.width = tileSize + 'px';
+    imageStyle.height = tileSize + 'px';
     tileElement = image;
     tileElementStyle = imageStyle;
   }
diff --git a/src/ol/renderer/layerrenderer.js b/src/ol/renderer/layerrenderer.js
index dfce3aae5e..4ef96fd124 100644
--- a/src/ol/renderer/layerrenderer.js
+++ b/src/ol/renderer/layerrenderer.js
@@ -197,13 +197,14 @@ ol.renderer.Layer.prototype.updateUsedTiles =
  * @param {function(ol.Tile): boolean} isLoadedFunction Function to
  *     determine if the tile is loaded.
  * @param {ol.source.Tile} tileSource Tile source.
+ * @param {number} pixelRatio Pixel ratio.
  * @param {ol.proj.Projection} projection Projection.
  * @protected
  * @return {function(number, number, number): ol.Tile} Returns a tile if it is
  *     loaded.
  */
 ol.renderer.Layer.prototype.createGetTileIfLoadedFunction =
-    function(isLoadedFunction, tileSource, projection) {
+    function(isLoadedFunction, tileSource, pixelRatio, projection) {
   return (
       /**
        * @param {number} z Z.
@@ -212,7 +213,7 @@ ol.renderer.Layer.prototype.createGetTileIfLoadedFunction =
        * @return {ol.Tile} Tile.
        */
       function(z, x, y) {
-        var tile = tileSource.getTile(z, x, y, projection);
+        var tile = tileSource.getTile(z, x, y, pixelRatio, projection);
         return isLoadedFunction(tile) ? tile : null;
       });
 };
@@ -244,6 +245,7 @@ ol.renderer.Layer.prototype.snapCenterToPixel =
  * @param {ol.FrameState} frameState Frame state.
  * @param {ol.source.Tile} tileSource Tile source.
  * @param {ol.tilegrid.TileGrid} tileGrid Tile grid.
+ * @param {number} pixelRatio Pixel ratio.
  * @param {ol.proj.Projection} projection Projection.
  * @param {ol.Extent} extent Extent.
  * @param {number} currentZ Current Z.
@@ -254,8 +256,8 @@ ol.renderer.Layer.prototype.snapCenterToPixel =
  * @template T
  */
 ol.renderer.Layer.prototype.manageTilePyramid = function(
-    frameState, tileSource, tileGrid, projection, extent, currentZ, preload,
-    opt_tileCallback, opt_this) {
+    frameState, tileSource, tileGrid, pixelRatio, projection, extent,
+    currentZ, preload, opt_tileCallback, opt_this) {
   var tileSourceKey = goog.getUid(tileSource).toString();
   if (!(tileSourceKey in frameState.wantedTiles)) {
     frameState.wantedTiles[tileSourceKey] = {};
@@ -270,7 +272,7 @@ ol.renderer.Layer.prototype.manageTilePyramid = function(
     for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
       for (y = tileRange.minY; y <= tileRange.maxY; ++y) {
         if (currentZ - z <= preload) {
-          tile = tileSource.getTile(z, x, y, projection);
+          tile = tileSource.getTile(z, x, y, pixelRatio, projection);
           if (tile.getState() == ol.TileState.IDLE) {
             wantedTiles[tile.tileCoord.toString()] = true;
             if (!tileQueue.isKeyQueued(tile.getKey())) {
diff --git a/src/ol/renderer/webgl/webglmaprenderer.js b/src/ol/renderer/webgl/webglmaprenderer.js
index bacc5b9df3..d2bdb4add3 100644
--- a/src/ol/renderer/webgl/webglmaprenderer.js
+++ b/src/ol/renderer/webgl/webglmaprenderer.js
@@ -473,10 +473,11 @@ ol.renderer.webgl.Map.prototype.renderFrame = function(frameState) {
     layerRenderer.prepareFrame(frameState, layerState);
   }
 
-  var size = frameState.size;
-  if (this.canvas_.width != size[0] || this.canvas_.height != size[1]) {
-    this.canvas_.width = size[0];
-    this.canvas_.height = size[1];
+  var width = frameState.size[0] * frameState.pixelRatio;
+  var height = frameState.size[1] * frameState.pixelRatio;
+  if (this.canvas_.width != width || this.canvas_.height != height) {
+    this.canvas_.width = width;
+    this.canvas_.height = height;
   }
 
   gl.bindFramebuffer(goog.webgl.FRAMEBUFFER, null);
diff --git a/src/ol/renderer/webgl/webgltilelayerrenderer.js b/src/ol/renderer/webgl/webgltilelayerrenderer.js
index 36bf1fa7ac..5d4afc6ddc 100644
--- a/src/ol/renderer/webgl/webgltilelayerrenderer.js
+++ b/src/ol/renderer/webgl/webgltilelayerrenderer.js
@@ -121,14 +121,14 @@ ol.renderer.webgl.TileLayer.prototype.prepareFrame =
   goog.asserts.assertInstanceof(tileLayer, ol.layer.Tile);
   var tileSource = tileLayer.getSource();
   goog.asserts.assertInstanceof(tileSource, ol.source.Tile);
-  var tileGrid = tileSource.getTileGrid();
-  if (goog.isNull(tileGrid)) {
-    tileGrid = ol.tilegrid.getForProjection(projection);
-  }
+  var tileGrid = tileSource.getTileGridForProjection(projection);
   var z = tileGrid.getZForResolution(view2DState.resolution);
   var tileResolution = tileGrid.getResolution(z);
 
-  var tileSize = tileGrid.getTileSize(z);
+  var tilePixelSize =
+      tileSource.getTilePixelSize(z, frameState.pixelRatio, projection);
+  var pixelRatio = tilePixelSize / tileGrid.getTileSize(z);
+  var tilePixelResolution = tileResolution / pixelRatio;
   var tileGutter = tileSource.getGutter();
 
   var center = view2DState.center;
@@ -152,13 +152,13 @@ ol.renderer.webgl.TileLayer.prototype.prepareFrame =
 
     var tileRangeSize = tileRange.getSize();
 
-    var maxDimension =
-        Math.max(tileRangeSize[0] * tileSize, tileRangeSize[1] * tileSize);
+    var maxDimension = Math.max(
+        tileRangeSize[0] * tilePixelSize, tileRangeSize[1] * tilePixelSize);
     var framebufferDimension = ol.math.roundUpToPowerOfTwo(maxDimension);
-    var framebufferExtentDimension = tileResolution * framebufferDimension;
+    var framebufferExtentDimension = tilePixelResolution * framebufferDimension;
     var origin = tileGrid.getOrigin(z);
-    var minX = origin[0] + tileRange.minX * tileSize * tileResolution;
-    var minY = origin[1] + tileRange.minY * tileSize * tileResolution;
+    var minX = origin[0] + tileRange.minX * tilePixelSize * tilePixelResolution;
+    var minY = origin[1] + tileRange.minY * tilePixelSize * tilePixelResolution;
     framebufferExtent = [
       minX, minY,
       minX + framebufferExtentDimension, minY + framebufferExtentDimension
@@ -196,7 +196,7 @@ ol.renderer.webgl.TileLayer.prototype.prepareFrame =
     var getTileIfLoaded = this.createGetTileIfLoadedFunction(function(tile) {
       return !goog.isNull(tile) && tile.getState() == ol.TileState.LOADED &&
           mapRenderer.isTileTextureLoaded(tile);
-    }, tileSource, projection);
+    }, tileSource, pixelRatio, projection);
     var findLoadedTiles = goog.bind(tileSource.findLoadedTiles, tileSource,
         tilesToDrawByZ, getTileIfLoaded);
 
@@ -207,7 +207,7 @@ ol.renderer.webgl.TileLayer.prototype.prepareFrame =
     for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
       for (y = tileRange.minY; y <= tileRange.maxY; ++y) {
 
-        tile = tileSource.getTile(z, x, y, projection);
+        tile = tileSource.getTile(z, x, y, pixelRatio, projection);
         tileState = tile.getState();
         if (tileState == ol.TileState.LOADED) {
           if (mapRenderer.isTileTextureLoaded(tile)) {
@@ -254,8 +254,8 @@ ol.renderer.webgl.TileLayer.prototype.prepareFrame =
             framebufferExtentDimension - 1;
         goog.vec.Vec4.setFromValues(u_tileOffset, sx, sy, tx, ty);
         gl.uniform4fv(this.locations_.u_tileOffset, u_tileOffset);
-        mapRenderer.bindTileTexture(tile, tileSize, tileGutter,
-            goog.webgl.LINEAR, goog.webgl.LINEAR);
+        mapRenderer.bindTileTexture(tile, tilePixelSize,
+            tileGutter * pixelRatio, goog.webgl.LINEAR, goog.webgl.LINEAR);
         gl.drawArrays(goog.webgl.TRIANGLE_STRIP, 0, 4);
       }
     }
@@ -276,7 +276,7 @@ ol.renderer.webgl.TileLayer.prototype.prepareFrame =
   this.updateUsedTiles(frameState.usedTiles, tileSource, z, tileRange);
   var tileTextureQueue = mapRenderer.getTileTextureQueue();
   this.manageTilePyramid(
-      frameState, tileSource, tileGrid, projection, extent, z,
+      frameState, tileSource, tileGrid, pixelRatio, projection, extent, z,
       tileLayer.getPreload(),
       /**
        * @param {ol.Tile} tile Tile.
@@ -289,7 +289,7 @@ ol.renderer.webgl.TileLayer.prototype.prepareFrame =
             tile,
             tileGrid.getTileCoordCenter(tile.tileCoord),
             tileGrid.getResolution(tile.tileCoord.z),
-            tileSize, tileGutter
+            tilePixelSize, tileGutter * pixelRatio
           ]);
         }
       }, this);
diff --git a/src/ol/source/bingmapssource.js b/src/ol/source/bingmapssource.js
index 268f949237..c060ee88e1 100644
--- a/src/ol/source/bingmapssource.js
+++ b/src/ol/source/bingmapssource.js
@@ -101,10 +101,11 @@ ol.source.BingMaps.prototype.handleImageryMetadataResponse =
                     /**
                      * @this {ol.source.BingMaps}
                      * @param {ol.TileCoord} tileCoord Tile coordinate.
+                     * @param {number} pixelRatio Pixel ratio.
                      * @param {ol.proj.Projection} projection Projection.
                      * @return {string|undefined} Tile URL.
                      */
-                    function(tileCoord, projection) {
+                    function(tileCoord, pixelRatio, projection) {
                       goog.asserts.assert(ol.proj.equivalent(
                           projection, this.getProjection()));
                       if (goog.isNull(tileCoord)) {
diff --git a/src/ol/source/tileimagesource.js b/src/ol/source/tileimagesource.js
index bf7d0982db..fe255e2cee 100644
--- a/src/ol/source/tileimagesource.js
+++ b/src/ol/source/tileimagesource.js
@@ -119,14 +119,15 @@ ol.source.TileImage.prototype.expireCache = function(usedTiles) {
 /**
  * @inheritDoc
  */
-ol.source.TileImage.prototype.getTile = function(z, x, y, projection) {
+ol.source.TileImage.prototype.getTile =
+    function(z, x, y, pixelRatio, projection) {
   var tileCoordKey = this.getKeyZXY(z, x, y);
   if (this.tileCache.containsKey(tileCoordKey)) {
     return /** @type {!ol.Tile} */ (this.tileCache.get(tileCoordKey));
   } else {
     goog.asserts.assert(projection);
     var tileCoord = new ol.TileCoord(z, x, y);
-    var tileUrl = this.tileUrlFunction(tileCoord, projection);
+    var tileUrl = this.tileUrlFunction(tileCoord, pixelRatio, projection);
     var tile = new this.tileClass(
         tileCoord,
         goog.isDef(tileUrl) ? ol.TileState.IDLE : ol.TileState.EMPTY,
diff --git a/src/ol/source/tilesource.js b/src/ol/source/tilesource.js
index 541659d2d2..732ab63d2f 100644
--- a/src/ol/source/tilesource.js
+++ b/src/ol/source/tilesource.js
@@ -144,6 +144,7 @@ ol.source.Tile.prototype.getResolutions = function() {
  * @param {number} z Tile coordinate z.
  * @param {number} x Tile coordinate x.
  * @param {number} y Tile coordinate y.
+ * @param {number} pixelRatio Pixel ratio.
  * @param {ol.proj.Projection=} opt_projection Projection.
  * @return {!ol.Tile} Tile.
  */
@@ -158,6 +159,32 @@ ol.source.Tile.prototype.getTileGrid = function() {
 };
 
 
+/**
+ * @param {ol.proj.Projection} projection Projection.
+ * @return {ol.tilegrid.TileGrid} Tile grid.
+ */
+ol.source.Tile.prototype.getTileGridForProjection = function(projection) {
+  if (goog.isNull(this.tileGrid)) {
+    return ol.tilegrid.getForProjection(projection);
+  } else {
+    return this.tileGrid;
+  }
+};
+
+
+/**
+ * @param {number} z Z.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.proj.Projection} projection Projection.
+ * @return {number} Tile size.
+ */
+ol.source.Tile.prototype.getTilePixelSize =
+    function(z, pixelRatio, projection) {
+  var tileGrid = this.getTileGridForProjection(projection);
+  return tileGrid.getTileSize(z);
+};
+
+
 /**
  * Marks a tile coord as being used, without triggering a load.
  * @param {number} z Tile coordinate z.
diff --git a/src/ol/source/tilewmssource.js b/src/ol/source/tilewmssource.js
index 027c711e3e..bcabf10712 100644
--- a/src/ol/source/tilewmssource.js
+++ b/src/ol/source/tilewmssource.js
@@ -4,6 +4,7 @@
 goog.provide('ol.source.TileWMS');
 
 goog.require('goog.array');
+goog.require('goog.asserts');
 goog.require('goog.math');
 goog.require('goog.object');
 goog.require('goog.string');
@@ -13,6 +14,7 @@ goog.require('ol.TileUrlFunction');
 goog.require('ol.extent');
 goog.require('ol.source.TileImage');
 goog.require('ol.source.wms');
+goog.require('ol.source.wms.ServerType');
 
 
 
@@ -71,6 +73,18 @@ ol.source.TileWMS = function(opt_options) {
    */
   this.v13_ = true;
 
+  /**
+   * @private
+   * @type {ol.source.wms.ServerType|undefined}
+   */
+  this.serverType_ = options.serverType;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.hidpi_ = goog.isDef(options.hidpi) ? options.hidpi : true;
+
   /**
    * @private
    * @type {string}
@@ -117,6 +131,23 @@ ol.source.TileWMS.prototype.getParams = function() {
 };
 
 
+/**
+ * @param {number} z Z.
+ * @param {number} pixelRatio Pixel ratio.
+ * @param {ol.proj.Projection} projection Projection.
+ * @return {number} Size.
+ */
+ol.source.TileWMS.prototype.getTilePixelSize =
+    function(z, pixelRatio, projection) {
+  var tileSize = goog.base(this, 'getTilePixelSize', z, pixelRatio, projection);
+  if (pixelRatio == 1 || !this.hidpi_ || !goog.isDef(this.serverType_)) {
+    return tileSize;
+  } else {
+    return (tileSize * pixelRatio + 0.5) | 0;
+  }
+};
+
+
 /**
  * @private
  */
@@ -132,11 +163,13 @@ ol.source.TileWMS.prototype.resetCoordKeyPrefix_ = function() {
 
 /**
  * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {number} pixelRatio Pixel ratio.
  * @param {ol.proj.Projection} projection Projection.
  * @private
  * @return {string|undefined} Tile URL.
  */
-ol.source.TileWMS.prototype.tileUrlFunction_ = function(tileCoord, projection) {
+ol.source.TileWMS.prototype.tileUrlFunction_ =
+    function(tileCoord, pixelRatio, projection) {
 
   var urls = this.urls_;
   if (!goog.isDef(urls) || goog.array.isEmpty(urls)) {
@@ -145,7 +178,7 @@ ol.source.TileWMS.prototype.tileUrlFunction_ = function(tileCoord, projection) {
 
   var tileGrid = this.getTileGrid();
   if (goog.isNull(tileGrid)) {
-    tileGrid = ol.tilegrid.getForProjection(projection);
+    tileGrid = this.getTileGridForProjection(projection);
   }
 
   if (tileGrid.getResolutions().length <= tileCoord.z) {
@@ -164,17 +197,21 @@ ol.source.TileWMS.prototype.tileUrlFunction_ = function(tileCoord, projection) {
   goog.object.extend(params, this.params_);
 
   var tileResolution = tileGrid.getResolution(tileCoord.z);
+  if (pixelRatio != 1 && (!this.hidpi_ || !goog.isDef(this.serverType_))) {
+    pixelRatio = 1;
+  }
   var tileSize = tileGrid.getTileSize(tileCoord.z);
   var gutter = this.gutter_;
-  if (gutter === 0) {
-    goog.object.set(params, 'WIDTH', tileSize);
-    goog.object.set(params, 'HEIGHT', tileSize);
-  } else {
-    goog.object.set(params, 'WIDTH', tileSize + 2 * gutter);
-    goog.object.set(params, 'HEIGHT', tileSize + 2 * gutter);
+  if (gutter !== 0) {
+    tileSize += 2 * gutter;
     tileExtent =
         ol.extent.buffer(tileExtent, tileResolution * gutter, this.tmpExtent_);
   }
+  if (pixelRatio != 1) {
+    tileSize = (tileSize * pixelRatio + 0.5) | 0;
+  }
+  goog.object.set(params, 'WIDTH', tileSize);
+  goog.object.set(params, 'HEIGHT', tileSize);
 
   params[this.v13_ ? 'CRS' : 'SRS'] = projection.getCode();
 
@@ -182,6 +219,24 @@ ol.source.TileWMS.prototype.tileUrlFunction_ = function(tileCoord, projection) {
     goog.object.set(params, 'STYLES', new String(''));
   }
 
+  if (pixelRatio != 1) {
+    switch (this.serverType_) {
+      case ol.source.wms.ServerType.GEOSERVER:
+        var dpi = (90 * pixelRatio + 0.5) | 0;
+        goog.object.set(params, 'FORMAT_OPTIONS', 'dpi:' + dpi);
+        break;
+      case ol.source.wms.ServerType.MAPSERVER:
+        goog.object.set(params, 'MAP_RESOLUTION', 90 * pixelRatio);
+        break;
+      case ol.source.wms.ServerType.QGIS:
+        goog.object.set(params, 'DPI', 90 * pixelRatio);
+        break;
+      default:
+        goog.asserts.fail();
+        break;
+    }
+  }
+
   var axisOrientation = projection.getAxisOrientation();
   var bbox;
   if (this.v13_ && axisOrientation.substr(0, 2) == 'ne') {
diff --git a/src/ol/source/wmtssource.js b/src/ol/source/wmtssource.js
index 15e2aae7bb..bd0d7c514b 100644
--- a/src/ol/source/wmtssource.js
+++ b/src/ol/source/wmtssource.js
@@ -96,10 +96,11 @@ ol.source.WMTS = function(options) {
         /**
          * @this {ol.source.WMTS}
          * @param {ol.TileCoord} tileCoord Tile coordinate.
+         * @param {number} pixelRatio Pixel ratio.
          * @param {ol.proj.Projection} projection Projection.
          * @return {string|undefined} Tile URL.
          */
-        function(tileCoord, projection) {
+        function(tileCoord, pixelRatio, projection) {
           if (goog.isNull(tileCoord)) {
             return undefined;
           } else {
diff --git a/src/ol/source/zoomifysource.js b/src/ol/source/zoomifysource.js
index 7e1a372d47..011b8056ca 100644
--- a/src/ol/source/zoomifysource.js
+++ b/src/ol/source/zoomifysource.js
@@ -61,10 +61,11 @@ ol.source.Zoomify = function(opt_options) {
       /**
        * @this {ol.source.TileImage}
        * @param {ol.TileCoord} tileCoord Tile Coordinate.
+       * @param {number} pixelRatio Pixel ratio.
        * @param {ol.proj.Projection} projection Projection.
        * @return {string|undefined} Tile URL.
        */
-      function(tileCoord, projection) {
+      function(tileCoord, pixelRatio, projection) {
         if (goog.isNull(tileCoord)) {
           return undefined;
         } else {
diff --git a/src/ol/tileurlfunction.js b/src/ol/tileurlfunction.js
index 8b8e17620b..ed7a17d9c3 100644
--- a/src/ol/tileurlfunction.js
+++ b/src/ol/tileurlfunction.js
@@ -8,7 +8,7 @@ goog.require('ol.TileCoord');
 
 /**
  * @typedef {function(this: ol.source.TileImage, ol.TileCoord,
- *     ol.proj.Projection): (string|undefined)}
+ *     number, ol.proj.Projection): (string|undefined)}
  */
 ol.TileUrlFunctionType;
 
@@ -29,10 +29,11 @@ ol.TileUrlFunction.createFromTemplate = function(template) {
       /**
        * @this {ol.source.TileImage}
        * @param {ol.TileCoord} tileCoord Tile Coordinate.
+       * @param {number} pixelRatio Pixel ratio.
        * @param {ol.proj.Projection} projection Projection.
        * @return {string|undefined} Tile URL.
        */
-      function(tileCoord, projection) {
+      function(tileCoord, pixelRatio, projection) {
         if (goog.isNull(tileCoord)) {
           return undefined;
         } else {
@@ -66,16 +67,18 @@ ol.TileUrlFunction.createFromTileUrlFunctions = function(tileUrlFunctions) {
       /**
        * @this {ol.source.TileImage}
        * @param {ol.TileCoord} tileCoord Tile Coordinate.
+       * @param {number} pixelRatio Pixel ratio.
        * @param {ol.proj.Projection} projection Projection.
        * @return {string|undefined} Tile URL.
        */
-      function(tileCoord, projection) {
+      function(tileCoord, pixelRatio, projection) {
         if (goog.isNull(tileCoord)) {
           return undefined;
         } else {
           var index =
               goog.math.modulo(tileCoord.hash(), tileUrlFunctions.length);
-          return tileUrlFunctions[index].call(this, tileCoord, projection);
+          return tileUrlFunctions[index].call(
+              this, tileCoord, pixelRatio, projection);
         }
       });
 };
@@ -84,10 +87,12 @@ ol.TileUrlFunction.createFromTileUrlFunctions = function(tileUrlFunctions) {
 /**
  * @this {ol.source.TileImage}
  * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {number} pixelRatio Pixel ratio.
  * @param {ol.proj.Projection} projection Projection.
  * @return {string|undefined} Tile URL.
  */
-ol.TileUrlFunction.nullTileUrlFunction = function(tileCoord, projection) {
+ol.TileUrlFunction.nullTileUrlFunction =
+    function(tileCoord, pixelRatio, projection) {
   return undefined;
 };
 
@@ -104,16 +109,18 @@ ol.TileUrlFunction.withTileCoordTransform =
       /**
        * @this {ol.source.TileImage}
        * @param {ol.TileCoord} tileCoord Tile Coordinate.
+       * @param {number} pixelRatio Pixel ratio.
        * @param {ol.proj.Projection} projection Projection.
        * @return {string|undefined} Tile URL.
        */
-      function(tileCoord, projection) {
+      function(tileCoord, pixelRatio, projection) {
         if (goog.isNull(tileCoord)) {
           return undefined;
         } else {
           return tileUrlFunction.call(
               this,
               transformFn.call(this, tileCoord, projection, tmpTileCoord),
+              pixelRatio,
               projection);
         }
       });
diff --git a/test/spec/ol/source/tilewmssource.test.js b/test/spec/ol/source/tilewmssource.test.js
index f27cee5b97..ecdc587cc4 100644
--- a/test/spec/ol/source/tilewmssource.test.js
+++ b/test/spec/ol/source/tilewmssource.test.js
@@ -17,7 +17,7 @@ describe('ol.source.TileWMS', function() {
 
     it('returns a tile with the expected URL', function() {
       var source = new ol.source.TileWMS(options);
-      var tile = source.getTile(3, 2, 1, ol.proj.get('EPSG:3857'));
+      var tile = source.getTile(3, 2, 1, 1, ol.proj.get('EPSG:3857'));
       expect(tile).to.be.an(ol.ImageTile);
       var uri = new goog.Uri(tile.src_);
       expect(uri.getScheme()).to.be('http');
@@ -44,7 +44,7 @@ describe('ol.source.TileWMS', function() {
     it('returns a larger tile when a gutter is specified', function() {
       options.gutter = 16;
       var source = new ol.source.TileWMS(options);
-      var tile = source.getTile(3, 2, 1, ol.proj.get('EPSG:3857'));
+      var tile = source.getTile(3, 2, 1, 1, ol.proj.get('EPSG:3857'));
       expect(tile).to.be.an(ol.ImageTile);
       var uri = new goog.Uri(tile.src_);
       var queryData = uri.getQueryData();
@@ -58,7 +58,7 @@ describe('ol.source.TileWMS', function() {
     it('sets the SRS query value instead of CRS if version < 1.3', function() {
       options.params.VERSION = '1.2';
       var source = new ol.source.TileWMS(options);
-      var tile = source.getTile(3, 2, 1, ol.proj.get('EPSG:4326'));
+      var tile = source.getTile(3, 2, 1, 1, ol.proj.get('EPSG:4326'));
       var uri = new goog.Uri(tile.src_);
       var queryData = uri.getQueryData();
       expect(queryData.get('CRS')).to.be(undefined);
@@ -69,7 +69,7 @@ describe('ol.source.TileWMS', function() {
       options.params.FORMAT = 'image/jpeg';
       options.params.TRANSPARENT = false;
       var source = new ol.source.TileWMS(options);
-      var tile = source.getTile(3, 2, 1, ol.proj.get('EPSG:4326'));
+      var tile = source.getTile(3, 2, 1, 1, ol.proj.get('EPSG:4326'));
       var uri = new goog.Uri(tile.src_);
       var queryData = uri.getQueryData();
       expect(queryData.get('FORMAT')).to.be('image/jpeg');
@@ -79,7 +79,7 @@ describe('ol.source.TileWMS', function() {
     it('does not add a STYLES= option if one is specified', function() {
       options.params.STYLES = 'foo';
       var source = new ol.source.TileWMS(options);
-      var tile = source.getTile(3, 2, 1, ol.proj.get('EPSG:4326'));
+      var tile = source.getTile(3, 2, 1, 1, ol.proj.get('EPSG:4326'));
       var uri = new goog.Uri(tile.src_);
       var queryData = uri.getQueryData();
       expect(queryData.get('STYLES')).to.be('foo');
@@ -87,7 +87,7 @@ describe('ol.source.TileWMS', function() {
 
     it('changes the BBOX order for EN axis orientations', function() {
       var source = new ol.source.TileWMS(options);
-      var tile = source.getTile(3, 2, 1, ol.proj.get('EPSG:4326'));
+      var tile = source.getTile(3, 2, 1, 1, ol.proj.get('EPSG:4326'));
       var uri = new goog.Uri(tile.src_);
       var queryData = uri.getQueryData();
       expect(queryData.get('BBOX')).to.be('-45,-90,0,-45');
@@ -96,7 +96,7 @@ describe('ol.source.TileWMS', function() {
     it('uses EN BBOX order if version < 1.3', function() {
       options.params.VERSION = '1.1.0';
       var source = new ol.source.TileWMS(options);
-      var tile = source.getTile(3, 2, 1, ol.proj.get('CRS:84'));
+      var tile = source.getTile(3, 2, 1, 1, ol.proj.get('CRS:84'));
       var uri = new goog.Uri(tile.src_);
       var queryData = uri.getQueryData();
       expect(queryData.get('BBOX')).to.be('-90,-45,-45,0');