diff --git a/src/index.html b/src/index.html
index 2af53fb..faf9f33 100644
--- a/src/index.html
+++ b/src/index.html
@@ -191,20 +191,20 @@ file, You can obtain one at http://mozilla.org/MPL/2.0/.
         </div>
         <div class="card d-inline-block">
             <div class="card-body p-1">
-                <div class="btn btn-primary" onclick="pdfZoom('fitheight');"><i class="fas fa-arrows-alt-v"></i> Fit Height</div>
-                <div class="btn btn-primary" onclick="pdfZoom('fitwidth');"><i class="fas fa-arrows-alt-h"></i> Fit Width</div>
-                <div class="btn btn-primary" onclick="pdfZoom('out');"><i class="fas fa-search-minus"></i> Zoom Out</div>
-                <div class="btn btn-primary" onclick="pdfZoom('in');"><i class="fas fa-search-plus"></i> Zoom In</div>
+                <div class="btn btn-primary enable-when-doc-open disabled" onclick="pdfZoom('fitheight');"><i class="fas fa-arrows-alt-v"></i> Fit Height</div>
+                <div class="btn btn-primary enable-when-doc-open disabled" onclick="pdfZoom('fitwidth');"><i class="fas fa-arrows-alt-h"></i> Fit Width</div>
+                <div class="btn btn-primary enable-when-doc-open disabled" onclick="pdfZoom('out');"><i class="fas fa-search-minus"></i> Zoom Out</div>
+                <div class="btn btn-primary enable-when-doc-open disabled" onclick="pdfZoom('in');"><i class="fas fa-search-plus"></i> Zoom In</div>
             </div>
         </div>
         <div class="card d-inline-block">
             <div class="card-body p-1">
-                <div class="btn btn-primary" onclick="activateStampDrawTool()"><i class="fas fa-stamp"></i> Stamp/Seal</div>
-                <div class="btn btn-primary" onclick="activateClientSignaturePad()"><i class="fas fa-file-signature"></i> Sign (Client)</div>
-                <div class="btn btn-primary" onclick="activateNotarySignatureTool()"><i class="fas fa-file-signature"></i> Sign (Notary)</div>
-                <div class="btn btn-primary" onclick="activateTextTool()"><i class="fas fa-font"></i> Add Text</div>
-                <div class="btn btn-primary" onclick="activateNotaryCertificateTool()"><i class="fas fa-sticky-note"></i> Add Certificate</div>
-                <div class="btn btn-primary" onclick="addPage()"><i class="fas fa-plus"></i> Append Blank Page</div>
+                <div class="btn btn-primary enable-when-doc-open disabled" onclick="activateStampDrawTool()"><i class="fas fa-stamp"></i> Stamp/Seal</div>
+                <div class="btn btn-primary enable-when-doc-open disabled" onclick="activateClientSignaturePad()"><i class="fas fa-file-signature"></i> Sign (Client)</div>
+                <div class="btn btn-primary enable-when-doc-open disabled" onclick="activateNotarySignatureTool()"><i class="fas fa-file-signature"></i> Sign (Notary)</div>
+                <div class="btn btn-primary enable-when-doc-open disabled" onclick="activateTextTool()"><i class="fas fa-font"></i> Add Text</div>
+                <div class="btn btn-primary enable-when-doc-open disabled" onclick="activateNotaryCertificateTool()"><i class="fas fa-sticky-note"></i> Add Certificate</div>
+                <div class="btn btn-primary enable-when-doc-open disabled" onclick="addPage()"><i class="fas fa-plus"></i> Append Blank Page</div>
                 <div class="btn btn-primary disabled" id="cancelDrawBtn" onclick="disableGuideBox()">Cancel</div>
             </div>
         </div>
diff --git a/src/js/pdf.js b/src/js/pdf.js
index 186cb32..4fa4e74 100644
--- a/src/js/pdf.js
+++ b/src/js/pdf.js
@@ -36,7 +36,8 @@ function addPDF() {
             });
 
             renderAllPages(pdfDoc);
-            pdfZoom("fitwidth");
+            pdfZoom("fitheight");
+            $(".enable-when-doc-open").removeClass("disabled");
             // Initial/first page rendering
             //renderPage(pageNum);
         });
@@ -51,6 +52,7 @@ function closePDF(showuserconfirm) {
     pageNumber = 0;
     pdfDoc = null;
     $("#page-canvas-container .page-canvas").remove();
+    $(".enable-when-doc-open").addClass("disabled");
 }
 
 function analyzeSignedPDF() {
@@ -106,6 +108,7 @@ function analyzeSignedPDF() {
                     };
                     fileReader.readAsArrayBuffer(html5file);
                 }
+                $(".enable-when-doc-open").removeClass("disabled");
             };
 
             if (typeof nw != 'undefined') {