diff --git a/src/iiiftilesource.js b/src/iiiftilesource.js
index 54f744f8..0e9f53b8 100644
--- a/src/iiiftilesource.js
+++ b/src/iiiftilesource.js
@@ -56,14 +56,6 @@ $.IIIFTileSource = function( options ){
     options.tileSizePerScaleFactor = {};
 
     this.usedFormat = "jpg";
-    if ( this.formatHints ) {
-        for (var f = 0; f < this.formatHints.length; f++ ) {
-            if ( $.imageFormatSupported(this.formatHints[f]) ) {
-                this.usedFormat = this.formatHints[f];
-                break;
-            }
-        }
-    }
 
     // N.B. 2.0 renamed scale_factors to scaleFactors
     if ( this.tile_width && this.tile_height ) {
diff --git a/src/tilesource.js b/src/tilesource.js
index cda10d7a..d85f5ee6 100644
--- a/src/tilesource.js
+++ b/src/tilesource.js
@@ -69,11 +69,6 @@
  *      the XHR's withCredentials (for accessing secure data).
  * @param {Object} [options.ajaxHeaders]
  *      A set of headers to include in AJAX requests.
- * @param {Object} [options.formatHints]
- *      An array of extensions to use for image URLs, by descending order of
- *      preference. The extensions are tested against the supported formats,
- *      in case none of the extension values is supported, the default (jpg)
- *      will be used.
  * @param {Number} [options.width]
  *      Width of the source image at max resolution in pixels.
  * @param {Number} [options.height]
@@ -223,7 +218,6 @@ $.TileSource = function( width, height, tileSize, tileOverlap, minLevel, maxLeve
         }
 
         this.tileOverlap = options.tileOverlap ? options.tileOverlap : 0;
-        this.formatHints = options.formatHints;
         this.minLevel    = options.minLevel ? options.minLevel : 0;
         this.maxLevel    = ( undefined !== options.maxLevel && null !== options.maxLevel ) ?
             options.maxLevel : (