diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml
new file mode 100644
index 00000000..a2f8957c
--- /dev/null
+++ b/.github/FUNDING.yml
@@ -0,0 +1,12 @@
+# These are supported funding model platforms
+
+github: iangilman
+patreon: iangilman
+open_collective: # Replace with a single Open Collective username
+ko_fi: iangilman
+tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']
diff --git a/changelog.txt b/changelog.txt
index d29ef6e1..0e9405ff 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -10,6 +10,7 @@ OPENSEADRAGON CHANGELOG
 * Miscellaneous code cleanup (#1840 @msalsbery)
 * You can now specify tileSize for the Zoomify Tile Source (#1868 @abrlam)
 * Better use of IIIF "max" and "full" URL parameters (#1871 @MImranAsghar)
+* You can now specify the file format of the tiles in the Zoomify tile source (#1889 @abrlam)
 * Improved browser sniffing - detect EDGE and CHROMEEDGE browsers (#1872 @msalsbery)
 * Improved DOM event model feature detection (#1872 @msalsbery)
 * Added support for options parameter on addEvent()/removeEvent (to support passive option) (#1872 @msalsbery)
diff --git a/package-lock.json b/package-lock.json
index 04ffb707..d236a0a3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2578,9 +2578,9 @@
       "dev": true
     },
     "ini": {
-      "version": "1.3.5",
-      "resolved": "https://registry.npmjs.org/ini/-/ini-1.3.5.tgz",
-      "integrity": "sha512-RZY5huIKCMRWDUqZlEi72f/lmXKMvuszcMBduliQ3nnWbx9X/ZBQO7DijMEYS9EhHBb2qacRUMtC7svLwe0lcw==",
+      "version": "1.3.7",
+      "resolved": "https://registry.npmjs.org/ini/-/ini-1.3.7.tgz",
+      "integrity": "sha512-iKpRpXP+CrP2jyrxvg1kMUpXDyRUFDWurxbnVT1vQPx+Wz9uCYsMIqYuSBLV+PAaZG/d7kRLKRFc9oDMsH+mFQ==",
       "dev": true
     },
     "is-accessor-descriptor": {
diff --git a/src/zoomifytilesource.js b/src/zoomifytilesource.js
index 7b62a6a8..9ffa4988 100644
--- a/src/zoomifytilesource.js
+++ b/src/zoomifytilesource.js
@@ -48,6 +48,11 @@
             options.tileSize = 256;
         }
 
+        if(typeof options.fileFormat === 'undefined'){
+            options.fileFormat = 'jpg';
+            this.fileFormat = options.fileFormat;
+        }
+
         var currentImageSize = {
             x: options.width,
             y: options.height
@@ -135,7 +140,7 @@
             var result = 0;
             var num = this._calculateAbsoluteTileNumber(level, x, y);
             result = Math.floor(num / 256);
-            return this.tilesUrl + 'TileGroup' + result + '/' + level + '-' + x + '-' + y + '.jpg';
+            return this.tilesUrl + 'TileGroup' + result + '/' + level + '-' + x + '-' + y + '.' + this.fileFormat;
 
         }
     });