diff --git a/examples/acroforms/acroforms.js b/examples/acroforms/acroforms.js
index 1f48233d7..125c3aa83 100644
--- a/examples/acroforms/acroforms.js
+++ b/examples/acroforms/acroforms.js
@@ -37,7 +37,7 @@ loadingTask.promise.then(function(doc) {
           container: container,
           id: pageNum,
           scale: DEFAULT_SCALE,
-          defaultViewport: pdfPage.getViewport(DEFAULT_SCALE),
+          defaultViewport: pdfPage.getViewport({ scale: DEFAULT_SCALE, }),
           annotationLayerFactory:
             new pdfjsViewer.DefaultAnnotationLayerFactory(),
           renderInteractiveForms: true,
diff --git a/examples/browserify/main.js b/examples/browserify/main.js
index cb7f5b563..6c4e144b1 100644
--- a/examples/browserify/main.js
+++ b/examples/browserify/main.js
@@ -17,7 +17,7 @@ loadingTask.promise.then(function (pdfDocument) {
   // Request a first page
   return pdfDocument.getPage(1).then(function (pdfPage) {
     // Display page on the existing canvas with 100% scale.
-    var viewport = pdfPage.getViewport(1.0);
+    var viewport = pdfPage.getViewport({ scale: 1.0, });
     var canvas = document.getElementById('theCanvas');
     canvas.width = viewport.width;
     canvas.height = viewport.height;
diff --git a/examples/components/pageviewer.js b/examples/components/pageviewer.js
index df69fdad0..d58f4ccb4 100644
--- a/examples/components/pageviewer.js
+++ b/examples/components/pageviewer.js
@@ -50,7 +50,7 @@ loadingTask.promise.then(function(pdfDocument) {
       container: container,
       id: PAGE_TO_VIEW,
       scale: SCALE,
-      defaultViewport: pdfPage.getViewport(SCALE),
+      defaultViewport: pdfPage.getViewport({ scale: SCALE, }),
       // We can enable text/annotations layers, if needed
       textLayerFactory: new pdfjsViewer.DefaultTextLayerFactory(),
       annotationLayerFactory: new pdfjsViewer.DefaultAnnotationLayerFactory(),
diff --git a/examples/node/getinfo.js b/examples/node/getinfo.js
index f85e911a1..3df0b2bac 100644
--- a/examples/node/getinfo.js
+++ b/examples/node/getinfo.js
@@ -38,7 +38,7 @@ loadingTask.promise.then(function(doc) {
   var loadPage = function (pageNum) {
     return doc.getPage(pageNum).then(function (page) {
       console.log('# Page ' + pageNum);
-      var viewport = page.getViewport(1.0 /* scale */);
+      var viewport = page.getViewport({ scale: 1.0, });
       console.log('Size: ' + viewport.width + 'x' + viewport.height);
       console.log();
       return page.getTextContent().then(function (content) {
diff --git a/examples/node/pdf2png/pdf2png.js b/examples/node/pdf2png/pdf2png.js
index 2fa7635ce..015851238 100644
--- a/examples/node/pdf2png/pdf2png.js
+++ b/examples/node/pdf2png/pdf2png.js
@@ -64,7 +64,7 @@ loadingTask.promise.then(function(pdfDocument) {
   // Get the first page.
   pdfDocument.getPage(1).then(function (page) {
     // Render the page on a Node canvas with 100% scale.
-    var viewport = page.getViewport(1.0);
+    var viewport = page.getViewport({ scale: 1.0, });
     var canvasFactory = new NodeCanvasFactory();
     var canvasAndContext =
       canvasFactory.create(viewport.width, viewport.height);
diff --git a/examples/node/pdf2svg.js b/examples/node/pdf2svg.js
index 3ac42f80c..50860d869 100644
--- a/examples/node/pdf2svg.js
+++ b/examples/node/pdf2svg.js
@@ -100,7 +100,7 @@ loadingTask.promise.then(function(doc) {
   var loadPage = function (pageNum) {
     return doc.getPage(pageNum).then(function (page) {
       console.log('# Page ' + pageNum);
-      var viewport = page.getViewport(1.0 /* scale */);
+      var viewport = page.getViewport({ scale: 1.0, });
       console.log('Size: ' + viewport.width + 'x' + viewport.height);
       console.log();
 
diff --git a/examples/text-only/pdf2svg.js b/examples/text-only/pdf2svg.js
index 72295b1a6..3ce9d6259 100644
--- a/examples/text-only/pdf2svg.js
+++ b/examples/text-only/pdf2svg.js
@@ -52,7 +52,7 @@ function pageLoaded() {
   var loadingTask = pdfjsLib.getDocument({ url: PDF_PATH, });
   loadingTask.promise.then(function(pdfDocument) {
     pdfDocument.getPage(PAGE_NUMBER).then(function (page) {
-      var viewport = page.getViewport(PAGE_SCALE);
+      var viewport = page.getViewport({ scale: PAGE_SCALE, });
       page.getTextContent().then(function (textContent) {
         // building SVG and adding that to the DOM
         var svg = buildSVG(viewport, textContent);
diff --git a/examples/webpack/main.js b/examples/webpack/main.js
index 62ff5e413..f8bfd179b 100644
--- a/examples/webpack/main.js
+++ b/examples/webpack/main.js
@@ -17,7 +17,7 @@ loadingTask.promise.then(function (pdfDocument) {
   // Request a first page
   return pdfDocument.getPage(1).then(function (pdfPage) {
     // Display page on the existing canvas with 100% scale.
-    var viewport = pdfPage.getViewport(1.0);
+    var viewport = pdfPage.getViewport({ scale: 1.0, });
     var canvas = document.getElementById('theCanvas');
     canvas.width = viewport.width;
     canvas.height = viewport.height;
diff --git a/src/display/api.js b/src/display/api.js
index 6a75d8288..a237b03a3 100644
--- a/src/display/api.js
+++ b/src/display/api.js
@@ -755,6 +755,17 @@ class PDFDocumentProxy {
   }
 }
 
+/**
+ * Page getViewport parameters.
+ *
+ * @typedef {Object} GetViewportParameters
+ * @property {number} scale - The desired scale of the viewport.
+ * @property {number} rotation - (optional) The desired rotation, in degrees, of
+ *   the viewport. If omitted it defaults to the page rotation.
+ * @property {boolean} dontFlip - (optional) If true, the y-axis will not be
+ *   flipped. The default value is `false`.
+ */
+
 /**
  * Page getTextContent parameters.
  *
@@ -811,7 +822,7 @@ class PDFDocumentProxy {
  * @typedef {Object} RenderParameters
  * @property {Object} canvasContext - A 2D context of a DOM Canvas object.
  * @property {PageViewport} viewport - Rendering viewport obtained by
- *                                calling of PDFPage.getViewport method.
+ *                          calling the `PDFPageProxy.getViewport` method.
  * @property {string} intent - Rendering intent, can be 'display' or 'print'
  *                    (default value is 'display').
  * @property {boolean} enableWebGL - (optional) Enables WebGL accelerated
@@ -900,18 +911,22 @@ class PDFPageProxy {
   }
 
   /**
-   * @param {number} scale The desired scale of the viewport.
-   * @param {number} rotate Degrees to rotate the viewport. If omitted this
-   * defaults to the page rotation.
-   * @param {boolean} dontFlip (optional) If true, axis Y will not be flipped.
+   * @param {GetViewportParameters} params - Viewport parameters.
    * @return {PageViewport} Contains 'width' and 'height' properties
-   * along with transforms required for rendering.
+   *   along with transforms required for rendering.
    */
-  getViewport(scale, rotate = this.rotate, dontFlip = false) {
+  getViewport({ scale, rotation = this.rotate, dontFlip = false, } = {}) {
+    if ((typeof PDFJSDev !== 'undefined' && PDFJSDev.test('GENERIC')) &&
+        (arguments.length > 1 || typeof arguments[0] === 'number')) {
+      deprecated('getViewport is called with obsolete arguments.');
+      scale = arguments[0];
+      rotation = typeof arguments[1] === 'number' ? arguments[1] : this.rotate;
+      dontFlip = typeof arguments[2] === 'boolean' ? arguments[2] : false;
+    }
     return new PageViewport({
       viewBox: this.view,
       scale,
-      rotation: rotate,
+      rotation,
       dontFlip,
     });
   }
diff --git a/src/display/dom_utils.js b/src/display/dom_utils.js
index 06f7a7b8e..511740513 100644
--- a/src/display/dom_utils.js
+++ b/src/display/dom_utils.js
@@ -140,11 +140,11 @@ class DOMSVGFactory {
  * @property {Array} viewBox - The xMin, yMin, xMax and yMax coordinates.
  * @property {number} scale - The scale of the viewport.
  * @property {number} rotation - The rotation, in degrees, of the viewport.
- * @property {number} offsetX - (optional) The vertical, i.e. x-axis, offset.
+ * @property {number} offsetX - (optional) The horizontal, i.e. x-axis, offset.
  *   The default value is `0`.
- * @property {number} offsetY - (optional) The horizontal, i.e. y-axis, offset.
+ * @property {number} offsetY - (optional) The vertical, i.e. y-axis, offset.
  *   The default value is `0`.
- * @property {boolean} dontFlip - (optional) If true, the x-axis will not be
+ * @property {boolean} dontFlip - (optional) If true, the y-axis will not be
  *   flipped. The default value is `false`.
  */
 
diff --git a/test/driver.js b/test/driver.js
index ae23dee2c..464f01e15 100644
--- a/test/driver.js
+++ b/test/driver.js
@@ -471,7 +471,7 @@ var Driver = (function DriverClosure() { // eslint-disable-line no-unused-vars
           this.canvas.mozOpaque = true;
           ctx = this.canvas.getContext('2d', { alpha: false, });
           task.pdfDoc.getPage(task.pageNum).then(function(page) {
-            var viewport = page.getViewport(PDF_TO_CSS_UNITS);
+            var viewport = page.getViewport({ scale: PDF_TO_CSS_UNITS, });
             self.canvas.width = viewport.width;
             self.canvas.height = viewport.height;
             self._clearCanvas();
diff --git a/test/unit/api_spec.js b/test/unit/api_spec.js
index 4ae03fbf0..c4accfd28 100644
--- a/test/unit/api_spec.js
+++ b/test/unit/api_spec.js
@@ -1034,7 +1034,7 @@ describe('api', function() {
       expect(page.view).toEqual([0, 0, 595.28, 841.89]);
     });
     it('gets viewport', function () {
-      var viewport = page.getViewport(1.5, 90);
+      var viewport = page.getViewport({ scale: 1.5, rotation: 90, });
       expect(viewport.viewBox).toEqual(page.view);
       expect(viewport.scale).toEqual(1.5);
       expect(viewport.rotation).toEqual(90);
@@ -1045,8 +1045,9 @@ describe('api', function() {
     it('gets viewport respecting "dontFlip" argument', function () {
       const scale = 1;
       const rotation = 135;
-      let viewport = page.getViewport(scale, rotation);
-      let dontFlipViewport = page.getViewport(scale, rotation, true);
+      let viewport = page.getViewport({ scale, rotation, });
+      let dontFlipViewport = page.getViewport({ scale, rotation,
+                                                dontFlip: true, });
 
       expect(dontFlipViewport).not.toEqual(viewport);
       expect(dontFlipViewport).toEqual(viewport.clone({ dontFlip: true, }));
@@ -1239,7 +1240,7 @@ describe('api', function() {
 
       loadingTask.promise.then((pdfDoc) => {
         return pdfDoc.getPage(1).then((pdfPage) => {
-          let viewport = pdfPage.getViewport(1);
+          let viewport = pdfPage.getViewport({ scale: 1, });
           canvasAndCtx = CanvasFactory.create(viewport.width, viewport.height);
 
           let renderTask = pdfPage.render({
@@ -1273,7 +1274,7 @@ describe('api', function() {
       if (isNodeJS()) {
         pending('TODO: Support Canvas testing in Node.js.');
       }
-      var viewport = page.getViewport(1);
+      var viewport = page.getViewport({ scale: 1, });
       var canvasAndCtx = CanvasFactory.create(viewport.width, viewport.height);
 
       var renderTask = page.render({
@@ -1297,7 +1298,7 @@ describe('api', function() {
       if (isNodeJS()) {
         pending('TODO: Support Canvas testing in Node.js.');
       }
-      let viewport = page.getViewport(1);
+      let viewport = page.getViewport({ scale: 1, });
       let canvasAndCtx = CanvasFactory.create(viewport.width, viewport.height);
 
       let renderTask = page.render({
@@ -1326,7 +1327,7 @@ describe('api', function() {
       if (isNodeJS()) {
         pending('TODO: Support Canvas testing in Node.js.');
       }
-      var viewport = page.getViewport(1);
+      var viewport = page.getViewport({ scale: 1, });
       var canvasAndCtx = CanvasFactory.create(viewport.width, viewport.height);
 
       var renderTask1 = page.render({
@@ -1368,7 +1369,7 @@ describe('api', function() {
       const pdf = await loadingTask.promise;
       pdfDocuments.push(pdf);
       const page = await pdf.getPage(1);
-      const viewport = page.getViewport(1.2);
+      const viewport = page.getViewport({ scale: 1.2, });
       const canvasAndCtx = CanvasFactory.create(viewport.width,
                                                 viewport.height);
       const renderTask = page.render({
diff --git a/test/unit/custom_spec.js b/test/unit/custom_spec.js
index 83bfca554..f0a60a900 100644
--- a/test/unit/custom_spec.js
+++ b/test/unit/custom_spec.js
@@ -61,7 +61,7 @@ describe('custom canvas rendering', function() {
     if (isNodeJS()) {
       pending('TODO: Support Canvas testing in Node.js.');
     }
-    var viewport = page.getViewport(1);
+    var viewport = page.getViewport({ scale: 1, });
     var canvasAndCtx = CanvasFactory.create(viewport.width, viewport.height);
 
     const renderTask = page.render({
@@ -80,7 +80,7 @@ describe('custom canvas rendering', function() {
     if (isNodeJS()) {
       pending('TODO: Support Canvas testing in Node.js.');
     }
-    var viewport = page.getViewport(1);
+    var viewport = page.getViewport({ scale: 1, });
     var canvasAndCtx = CanvasFactory.create(viewport.width, viewport.height);
 
     const renderTask = page.render({
diff --git a/web/base_viewer.js b/web/base_viewer.js
index f37353a19..388819871 100644
--- a/web/base_viewer.js
+++ b/web/base_viewer.js
@@ -419,7 +419,7 @@ class BaseViewer {
     // viewport for all pages
     firstPagePromise.then((pdfPage) => {
       let scale = this.currentScale;
-      let viewport = pdfPage.getViewport(scale * CSS_UNITS);
+      let viewport = pdfPage.getViewport({ scale: scale * CSS_UNITS, });
       for (let pageNum = 1; pageNum <= pagesCount; ++pageNum) {
         let textLayerFactory = null;
         if (this.textLayerMode !== TextLayerMode.DISABLE) {
@@ -1031,7 +1031,7 @@ class BaseViewer {
    */
   getPagesOverview() {
     let pagesOverview = this._pages.map(function(pageView) {
-      let viewport = pageView.pdfPage.getViewport(1);
+      let viewport = pageView.pdfPage.getViewport({ scale: 1, });
       return {
         width: viewport.width,
         height: viewport.height,
diff --git a/web/firefox_print_service.js b/web/firefox_print_service.js
index ccf77665d..d69a2d936 100644
--- a/web/firefox_print_service.js
+++ b/web/firefox_print_service.js
@@ -48,7 +48,7 @@ function composePage(pdfDocument, pageNumber, size, printContainer) {
       let renderContext = {
         canvasContext: ctx,
         transform: [PRINT_UNITS, 0, 0, PRINT_UNITS, 0, 0],
-        viewport: pdfPage.getViewport(1, size.rotation),
+        viewport: pdfPage.getViewport({ scale: 1, rotation: size.rotation, }),
         intent: 'print',
       };
       return pdfPage.render(renderContext).promise;
diff --git a/web/pdf_page_view.js b/web/pdf_page_view.js
index a72ecbd7d..148d66d47 100644
--- a/web/pdf_page_view.js
+++ b/web/pdf_page_view.js
@@ -118,8 +118,8 @@ class PDFPageView {
     this.pdfPageRotate = pdfPage.rotate;
 
     let totalRotation = (this.rotation + this.pdfPageRotate) % 360;
-    this.viewport = pdfPage.getViewport(this.scale * CSS_UNITS,
-                                        totalRotation);
+    this.viewport = pdfPage.getViewport({ scale: this.scale * CSS_UNITS,
+                                          rotation: totalRotation, });
     this.stats = pdfPage.stats;
     this.reset();
   }
diff --git a/web/pdf_print_service.js b/web/pdf_print_service.js
index 4ec3ea661..a77d11886 100644
--- a/web/pdf_print_service.js
+++ b/web/pdf_print_service.js
@@ -45,7 +45,7 @@ function renderPage(activeServiceOnEntry, pdfDocument, pageNumber, size) {
     let renderContext = {
       canvasContext: ctx,
       transform: [PRINT_UNITS, 0, 0, PRINT_UNITS, 0, 0],
-      viewport: pdfPage.getViewport(1, size.rotation),
+      viewport: pdfPage.getViewport({ scale: 1, rotation: size.rotation, }),
       intent: 'print',
     };
     return pdfPage.render(renderContext).promise;
diff --git a/web/pdf_thumbnail_view.js b/web/pdf_thumbnail_view.js
index 6463f44e1..0144000fd 100644
--- a/web/pdf_thumbnail_view.js
+++ b/web/pdf_thumbnail_view.js
@@ -146,7 +146,7 @@ class PDFThumbnailView {
     this.pdfPage = pdfPage;
     this.pdfPageRotate = pdfPage.rotate;
     let totalRotation = (this.rotation + this.pdfPageRotate) % 360;
-    this.viewport = pdfPage.getViewport(1, totalRotation);
+    this.viewport = pdfPage.getViewport({ scale: 1, rotation: totalRotation, });
     this.reset();
   }
 
diff --git a/web/pdf_thumbnail_viewer.js b/web/pdf_thumbnail_viewer.js
index 1573a0a04..1fdd89cab 100644
--- a/web/pdf_thumbnail_viewer.js
+++ b/web/pdf_thumbnail_viewer.js
@@ -166,7 +166,7 @@ class PDFThumbnailViewer {
 
     pdfDocument.getPage(1).then((firstPage) => {
       let pagesCount = pdfDocument.numPages;
-      let viewport = firstPage.getViewport(1.0);
+      let viewport = firstPage.getViewport({ scale: 1, });
       for (let pageNum = 1; pageNum <= pagesCount; ++pageNum) {
         let thumbnail = new PDFThumbnailView({
           container: this.container,