diff --git a/server/tilesource/openjpeg.py b/server/tilesource/openjpeg.py
index 1124c203b..1ca0b37a7 100644
--- a/server/tilesource/openjpeg.py
+++ b/server/tilesource/openjpeg.py
@@ -75,6 +75,9 @@ class OpenjpegFileTileSource(FileTileSource):
     }
     _xmlTag = b'mxl '
 
+    _minTileSize = 256
+    _maxTileSize = 512
+
     def __init__(self, path, **kwargs):
         """
         Initialize the tile class.  See the base class for other available
@@ -99,10 +102,24 @@ def __init__(self, path, **kwargs):
         except IndexError:
             raise TileSourceException('File cannot be opened via Glymur and OpenJPEG.')
         self.levels = self._openjpeg.codestream.segment[2].num_res + 1
+        self._minlevel = 0
         self.tileWidth = self.tileHeight = 2 ** int(math.ceil(max(
             math.log(float(self.sizeX)) / math.log(2) - self.levels + 1,
             math.log(float(self.sizeY)) / math.log(2) - self.levels + 1)))
-        # read associated images and metadata from boxes
+        # Small and large tiles are both inefficient.  Large tiles don't work
+        # with some viewers (leaflet and Slide Atlas, for instance)
+        if self.tileWidth < self._minTileSize or self.tileWidth > self._maxTileSize:
+            self.tileWidth = self.tileHeight = min(
+                self._maxTileSize, max(self._minTileSize, self.tileWidth))
+            self.levels = math.ceil(math.log(float(max(
+                self.sizeX, self.sizeY)) / self.tileWidth) / math.log(2)) + 1
+            self._minlevel = self.levels - self._openjpeg.codestream.segment[2].num_res - 1
+        self._getAssociatedImages()
+
+    def _getAssociatedImages(self):
+        """
+        Read associated images and metadata from boxes.
+        """
         self._associatedImages = {}
         for box in self._openjpeg.box:
             if box.box_id == self._xmlTag or box.box_id in self._boxToTag:
@@ -203,6 +220,10 @@ def getTile(self, x, y, z, pilImageAllowed=False, **kwargs):
             raise TileSourceException('x is outside layer')
         if y < 0 or y0 >= self.sizeY:
             raise TileSourceException('y is outside layer')
+        scale = None
+        if z < self._minlevel:
+            scale = 2 ** (self._minlevel - z)
+            step = 2 ** (self.levels - 1 - self._minlevel)
         # possible open the file multiple times so multiple threads can access
         # it concurrently.
         with self._openjpegLock:
@@ -218,6 +239,8 @@ def getTile(self, x, y, z, pilImageAllowed=False, **kwargs):
         if len(tile.shape) == 3:
             mode = ['L', 'LA', 'RGB', 'RGBA'][tile.shape[2] - 1]
         tile = PIL.Image.frombytes(mode, (tile.shape[1], tile.shape[0]), tile)
+        if scale:
+            tile = tile.resize((tile.size[0] // scale, tile.size[1] // scale), PIL.Image.LANCZOS)
         if tile.size != (self.tileWidth, self.tileHeight):
             wrap = PIL.Image.new(mode, (self.tileWidth, self.tileHeight))
             wrap.paste(tile, (0, 0))
diff --git a/web_client/views/imageViewerWidget/leaflet.js b/web_client/views/imageViewerWidget/leaflet.js
index 1858098bd..b416b8562 100644
--- a/web_client/views/imageViewerWidget/leaflet.js
+++ b/web_client/views/imageViewerWidget/leaflet.js
@@ -23,6 +23,7 @@ var LeafletImageViewerWidget = ImageViewerWidget.extend({
     },
 
     render: function () {
+        var errmsg;
         // If script or metadata isn't loaded, then abort
         if (!window.L || !this.tileWidth || !this.tileHeight || this.deleted) {
             return this;
@@ -34,7 +35,15 @@ var LeafletImageViewerWidget = ImageViewerWidget.extend({
         }
 
         if (this.tileWidth !== this.tileHeight) {
-            console.error('The Leaflet viewer only supports square tiles.');
+            errmsg = 'The Leaflet viewer only supports square tiles.';
+        }
+        if (this.tileWidth > 256) {
+            errmsg = 'The Leaflet viewer does not support tiles wider than 256 pixels.';
+        }
+        if (errmsg) {
+            this.viewer = $('<div/>').text(errmsg);
+            this.$el.append(this.viewer);
+            console.error(errmsg);
             return this;
         }
 
diff --git a/web_client/views/imageViewerWidget/slideatlas.js b/web_client/views/imageViewerWidget/slideatlas.js
index a108cb8d3..501b6964b 100644
--- a/web_client/views/imageViewerWidget/slideatlas.js
+++ b/web_client/views/imageViewerWidget/slideatlas.js
@@ -25,6 +25,7 @@ var SlideAtlasImageViewerWidget = ImageViewerWidget.extend({
     },
 
     render: function () {
+        var errmsg;
         // If script or metadata isn't loaded, then abort
         if (!window.SA || !this.tileWidth || !this.tileHeight || this.deleted) {
             return this;
@@ -36,7 +37,15 @@ var SlideAtlasImageViewerWidget = ImageViewerWidget.extend({
         }
 
         if (this.tileWidth !== this.tileHeight) {
-            console.error('The SlideAtlas viewer only supports square tiles.');
+            errmsg = 'The SlideAtlas viewer only supports square tiles.';
+        }
+        if (this.tileWidth > 256) {
+            errmsg = 'The SlideAtlas viewer does not support tiles wider than 256 pixels.';
+        }
+        if (errmsg) {
+            this.viewer = $('<div/>').text(errmsg);
+            this.$el.append(this.viewer);
+            console.error(errmsg);
             return this;
         }