diff --git a/l10n/en-US/viewer.properties b/l10n/en-US/viewer.properties
index f1c505478..7a795712b 100644
--- a/l10n/en-US/viewer.properties
+++ b/l10n/en-US/viewer.properties
@@ -89,6 +89,13 @@ document_properties_creator=Creator:
 document_properties_producer=PDF Producer:
 document_properties_version=PDF Version:
 document_properties_page_count=Page Count:
+document_properties_page_size=Page Size:
+# LOCALIZATION NOTE (document_properties_page_size_in): "{{width_in}}" and "{{height_in}}"
+# will be replaced by the size of the first page of the PDF file in inches.
+document_properties_page_size_in={{width_in}}in × {{height_in}}in
+# LOCALIZATION NOTE (document_properties_page_size_mm): "{{width_mm}}" and "{{height_mm}}"
+# will be replaced by the size of the first page of the PDF file in millimeters.
+document_properties_page_size_mm={{width_mm}}mm × {{height_mm}}mm
 document_properties_close=Close
 
 print_progress_message=Preparing document for printing…
diff --git a/src/display/api.js b/src/display/api.js
index 163f257b2..0d2e316fe 100644
--- a/src/display/api.js
+++ b/src/display/api.js
@@ -692,6 +692,23 @@ var PDFDocumentProxy = (function PDFDocumentProxyClosure() {
     getMetadata: function PDFDocumentProxy_getMetadata() {
       return this.transport.getMetadata();
     },
+    /**
+     * @param {number} pageNumber The page number to get the page size from.
+     * The first page is 1, which is also the default page used.
+     * @return {Promise} A promise that is resolved with an dict containing the
+     * width and height in inches.
+     */
+    getPageSizeInches(pageNumber) {
+      pageNumber = pageNumber || 1;
+      return this.getPage(pageNumber).then((page) => {
+        const [x1, y1, x2, y2] = page.view;
+        // convert values from user units to inches
+        return {
+          width: (x2 - x1) / 72 * page.userUnit,
+          height: (y2 - y1) / 72 * page.userUnit,
+        };
+      });
+    },
     /**
      * @return {Promise} A promise that is resolved with a TypedArray that has
      * the raw data from the PDF.
diff --git a/web/pdf_document_properties.js b/web/pdf_document_properties.js
index cb118920b..7f351592b 100644
--- a/web/pdf_document_properties.js
+++ b/web/pdf_document_properties.js
@@ -79,9 +79,14 @@ class PDFDocumentProperties {
           contentDispositionFilename || getPDFFileNameFromURL(this.url),
           this._parseFileSize(this.maybeFileSize),
           this._parseDate(info.CreationDate),
-          this._parseDate(info.ModDate)
+          this._parseDate(info.ModDate),
+          this.pdfDocument.getPageSizeInches().then((pageSizeInches) => {
+            return this._parsePageSize(pageSizeInches);
+          }),
+
         ]);
-      }).then(([info, metadata, fileName, fileSize, creationDate, modDate]) => {
+      }).then(([info, metadata, fileName, fileSize,
+                creationDate, modDate, pageSize]) => {
         freezeFieldData({
           'fileName': fileName,
           'fileSize': fileSize,
@@ -95,6 +100,8 @@ class PDFDocumentProperties {
           'producer': info.Producer,
           'version': info.PDFFormatVersion,
           'pageCount': this.pdfDocument.numPages,
+          'pageSizeInch': pageSize.inch,
+          'pageSizeMM': pageSize.mm,
         });
         this._updateUI();
 
@@ -212,6 +219,33 @@ class PDFDocumentProperties {
     }, '{{size_mb}} MB ({{size_b}} bytes)');
   }
 
+  /**
+   * @private
+   */
+  _parsePageSize(pageSizeInches) {
+    if (!pageSizeInches) {
+      return Promise.resolve([undefined, undefined]);
+    }
+    const sizes_two_units = {
+      'width_in': Math.round(pageSizeInches.width * 100) / 100,
+      'height_in': Math.round(pageSizeInches.height * 100) / 100,
+      // 1in = 25.4mm; no need to round to 2 decimals for mm
+      'width_mm': Math.round(pageSizeInches.width * 25.4 * 10) / 10,
+      'height_mm': Math.round(pageSizeInches.height * 25.4 * 10) / 10,
+    };
+    return Promise.all([
+      this.l10n.get('document_properties_page_size_in',
+        sizes_two_units, '{{width_in}} in × {{height_in}} in'),
+      this.l10n.get('document_properties_page_size_mm',
+        sizes_two_units, '{{width_mm}} mm × {{height_mm}} mm'),
+    ]).then(([parsedPageSizeInches, parsedPageSizeMM]) => {
+      return Promise.resolve({
+        inch: parsedPageSizeInches,
+        mm: parsedPageSizeMM,
+      });
+    });
+  }
+
   /**
    * @private
    */
diff --git a/web/viewer.html b/web/viewer.html
index 2faa0729c..7baec33e2 100644
--- a/web/viewer.html
+++ b/web/viewer.html
@@ -351,6 +351,13 @@ See https://github.com/adobe-type-tools/cmap-resources
             <div class="row">
               <span data-l10n-id="document_properties_page_count">Page Count:</span> <p id="pageCountField">-</p>
             </div>
+            <div class="row">
+              <span data-l10n-id="document_properties_page_size">Page Size:</span>
+                <p>
+                  <span id="pageSizeFieldMM">-</span><br>
+                  <span id="pageSizeFieldInch">-</span>
+                </p>
+            </div>
             <div class="buttonRow">
               <button id="documentPropertiesClose" class="overlayButton"><span data-l10n-id="document_properties_close">Close</span></button>
             </div>
diff --git a/web/viewer.js b/web/viewer.js
index 1c3fbb240..242bf1df6 100644
--- a/web/viewer.js
+++ b/web/viewer.js
@@ -159,6 +159,8 @@ function getViewerConfiguration() {
         'producer': document.getElementById('producerField'),
         'version': document.getElementById('versionField'),
         'pageCount': document.getElementById('pageCountField'),
+        'pageSizeInch': document.getElementById('pageSizeFieldInch'),
+        'pageSizeMM': document.getElementById('pageSizeFieldMM'),
       },
     },
     errorWrapper: {