diff --git a/apps/api/documents/api.js b/apps/api/documents/api.js
index 71a006e8ff..542fb28167 100644
--- a/apps/api/documents/api.js
+++ b/apps/api/documents/api.js
@@ -770,7 +770,9 @@
             if ( typeof(customization) == 'object' && ( customization.toolbarNoTabs ||
                                                         (config.editorConfig.targetApp!=='desktop') && (customization.loaderName || customization.loaderLogo))) {
                 index = "/index_loader.html";
-            }
+            } else if (config.editorConfig.mode == 'editdiagram' || config.editorConfig.mode == 'editmerge')
+                index = "/index_internal.html";
+
         }
         path += index;
         return path;
diff --git a/apps/spreadsheeteditor/main/index_internal.html b/apps/spreadsheeteditor/main/index_internal.html
new file mode 100644
index 0000000000..ffa6c2ac7d
--- /dev/null
+++ b/apps/spreadsheeteditor/main/index_internal.html
@@ -0,0 +1,235 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>ONLYOFFICE Document Editor</title>
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=IE8"/>
+    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=no">
+
+    <!-- splash -->
+    <style type="text/css">
+        .loadmask {
+            left: 0;
+            top: 0;
+            position: absolute;
+            height: 100%;
+            width: 100%;
+            overflow: hidden;
+            border: none;
+            background-color: #f4f4f4;
+            z-index: 1001;
+        }
+
+        .loadmask ul {
+            margin: 0;
+            padding: 0;
+            white-space: nowrap;
+            position: relative;
+        }
+
+        .loadmask > .skformula {
+            height: 24px;
+            background: #f1f1f1;
+        }
+
+        .loadmask > .skformula ul {
+            list-style-type: none;
+            font-size: 0;
+            box-sizing: border-box;
+            border-style: solid;
+            border-width: 1px;
+            border-color: #e1e1e1 transparent;
+        }
+
+        .loadmask > .skformula li {
+            display: inline-block;
+            box-sizing: border-box;
+            height: 19px;
+            width: 100%;
+            margin-left: 20px;
+            background: #f7f7f7;
+            border-style: solid;
+            border-width: 1px;
+            border-color: transparent #e1e1e1;
+        }
+
+        .loadmask > .skformula li:first-child {
+            width: 100px;
+            margin-left: 0;
+        }
+
+        .loadmask > .placeholder {
+            background: #fbfbfb;
+            width: 100%;
+            height: 100%;
+            font-size: 0;
+            border: 1px solid #dfdfdf;
+            white-space: nowrap;
+
+            -webkit-animation: flickerAnimation 2s infinite ease-in-out;
+            -moz-animation: flickerAnimation 2s infinite ease-in-out;
+            -o-animation: flickerAnimation 2s infinite ease-in-out;
+            animation: flickerAnimation 2s infinite ease-in-out;
+        }
+
+        .loadmask > .placeholder > .columns {
+            width: 100%;
+            height: 100%;
+            display: inline-block;
+            background: linear-gradient(90deg, #d5d5d5 0px, rgba(223,223,223,0) 1px) 0 0,
+                        linear-gradient(rgba(223,223,223,0) 19px, #d5d5d5 20px) 0 0,
+                        linear-gradient( #f1f1f1 0px, #f1f1f1 20px) 0 0 repeat-x;
+            background-size: 80px 20px;
+        }
+
+        .loadmask > .placeholder > .columns:first-child {
+            background: linear-gradient(#f1f1f1 19px, #d5d5d5 20px) 0 0;
+            background-size: 20px 20px;
+            width: 25px;
+        }
+
+        @keyframes flickerAnimation {
+            0%   { opacity:1; }
+            50%  { opacity:0.5; }
+            100% { opacity:1; }
+        }
+        @-o-keyframes flickerAnimation{
+            0%   { opacity:1; }
+            50%  { opacity:0.5; }
+            100% { opacity:1; }
+        }
+        @-moz-keyframes flickerAnimation{
+            0%   { opacity:1; }
+            50%  { opacity:0.5; }
+            100% { opacity:1; }
+        }
+        @-webkit-keyframes flickerAnimation{
+            0%   { opacity:1; }
+            50%  { opacity:0.5; }
+            100% { opacity:1; }
+        }
+    </style>
+
+    <script>
+        document.getElementsByTagName('html')[0].setAttribute('style', 'zoom: ' + 1 / (window.devicePixelRatio < 2 ? window.devicePixelRatio : window.devicePixelRatio / 2) + ';');
+
+        var userAgent = navigator.userAgent.toLowerCase(),
+            check = function(regex){ return regex.test(userAgent); },
+            stopLoading = false;
+        if (!check(/opera/) && (check(/msie/) || check(/trident/))) {
+            var m = /msie (\d+\.\d+)/.exec(userAgent);
+            if (m && parseFloat(m[1]) < 10.0) {
+                document.write(
+                    '<div class="app-error-panel">' +
+                        '<div class="message-block">' +
+                            '<div class="message-inner">' +
+                                '<div class="title">Your browser is not supported.</div>' +
+                                '<div class="text">Sorry, Spreadsheet Editor is currently only supported in the latest versions of the Chrome, Firefox, Safari or Internet Explorer web browsers.</div>' +
+                            '</div>' +
+                        '</div>' +
+                    '</div>');
+                stopLoading = true;
+            }
+        }
+
+        function getUrlParams() {
+            var e,
+                a = /\+/g,  // Regex for replacing addition symbol with a space
+                r = /([^&=]+)=?([^&]*)/g,
+                d = function (s) { return decodeURIComponent(s.replace(a, " ")); },
+                q = window.location.search.substring(1),
+                urlParams = {};
+
+            while (e = r.exec(q))
+                urlParams[d(e[1])] = d(e[2]);
+
+            return urlParams;
+        }
+
+        function encodeUrlParam(str) {
+            return str.replace(/&/g, '&amp;')
+                    .replace(/"/g, '&quot;')
+                    .replace(/'/g, '&#39;')
+                    .replace(/</g, '&lt;')
+                    .replace(/>/g, '&gt;');
+        }
+
+        var params = getUrlParams(),
+            lang = (params["lang"] || 'en').split(/[\-\_]/)[0];
+
+        window.frameEditorId = params["frameEditorId"];
+        window.parentOrigin = params["parentOrigin"];
+
+        if(/MSIE \d|Trident.*rv:/.test(navigator.userAgent))
+            document.write('<script src="../../common/main/lib/util/fix-ie-compat.js"><\/script>');
+    </script>
+
+    <link rel="stylesheet" type="text/css" href="../../../../sdkjs/cell/css/main.css"/>
+
+    <!-- debug begin -->
+    <link rel="stylesheet/less" type="text/css" href="resources/less/app.less" />
+    <!-- debug end -->
+</head>
+
+<body>
+    <div id="loading-mask" class="loadmask">
+        <div class="skformula">
+            <ul><li/><li/></ul>
+        </div>
+        <div class="placeholder">
+            <div class="columns"></div><div class="columns"></div>
+        </div>
+    </div>
+
+    <div id="viewport"></div>
+
+    <script>
+        if (stopLoading) {
+            document.body.removeChild(document.getElementById('loading-mask'));
+        }
+    </script>
+
+    <script src="../../../vendor/svg-injector/svg-injector.min.js"></script>
+    <!--<img class="inline-svg" src="../../common/main/resources/img/header/buttons.svg">-->
+    <img class="inline-svg" src="../../common/main/resources/img/toolbar/charttypes.svg">
+    <script>
+        var svgpoints = document.querySelectorAll('img.inline-svg');
+        SVGInjector(svgpoints);
+    </script>
+
+    <script type="text/javascript">
+        window.g_debug_mode = true;
+    </script>
+
+    <!-- debug begin -->
+    <script type="text/javascript">var less=less||{};less.env='development';less.async=true;</script>
+    <script src="../../../vendor/less/dist/less.js" type="text/javascript"></script>
+    <!-- debug end -->
+
+    <script type="text/javascript" src="../../../vendor/jquery/jquery.min.js"></script>
+    <script type="text/javascript" src="../../../vendor/xregexp/xregexp-all-min.js"></script>
+
+    <script type="text/javascript" src="../../../../sdkjs/develop/sdkjs/cell/scripts.js"></script>
+    <script>
+        window.sdk_scripts.forEach(function(item){
+            document.write('<script type="text/javascript" src="' + item + '"><\/script>');
+        });
+
+        window.requireTimeourError = function(){
+            var reqerr;
+
+            if ( lang == 'de')      reqerr = 'Die Verbindung ist zu langsam, einige Komponenten konnten nicht geladen werden. Aktualisieren Sie bitte die Seite.';
+            else if ( lang == 'es') reqerr = 'La conexión es muy lenta, algunos de los componentes no han podido cargar. Por favor recargue la página.';
+            else if ( lang == 'fr') reqerr = 'La connexion est trop lente, certains des composants n\'ons pas pu être chargé. Veuillez recharger la page.';
+            else if ( lang == 'ru') reqerr = 'Слишком медленное соединение, не удается загрузить некоторые компоненты. Пожалуйста, обновите страницу.';
+            else reqerr = 'The connection is too slow, some of the components could not be loaded. Please reload the page.';
+
+            return reqerr;
+        };
+    </script>
+
+    <!-- application -->
+    <script data-main="app_dev" src="../../../vendor/requirejs/require.js"></script>
+
+</body>
+</html>
diff --git a/apps/spreadsheeteditor/main/index_internal.html.deploy b/apps/spreadsheeteditor/main/index_internal.html.deploy
new file mode 100644
index 0000000000..73ba16dc1b
--- /dev/null
+++ b/apps/spreadsheeteditor/main/index_internal.html.deploy
@@ -0,0 +1,232 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>ONLYOFFICE Document Editor</title>
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=IE8"/>
+    <meta name="description" content="" />
+    <meta name="keywords" content="" />
+    <link rel="icon" href="resources/img/favicon.ico" type="image/x-icon" />
+
+    <!-- splash -->
+    <style type="text/css">
+        .loadmask {
+            left: 0;
+            top: 0;
+            position: absolute;
+            height: 100%;
+            width: 100%;
+            overflow: hidden;
+            border: none;
+            background-color: #f4f4f4;
+            z-index: 1001;
+        }
+
+        .loadmask ul {
+            margin: 0;
+            padding: 0;
+            white-space: nowrap;
+            position: relative;
+        }
+
+        .loadmask>.skformula {
+            height: 24px;
+            background: #f1f1f1;
+        }
+
+        .loadmask>.skformula ul {
+            list-style-type: none;
+            font-size: 0;
+            box-sizing: border-box;
+            border-style: solid;
+            border-width: 1px;
+            border-color: #e1e1e1 transparent;
+        }
+
+        .loadmask>.skformula li {
+            display: inline-block;
+            box-sizing: border-box;
+            height: 19px;
+            width: 100%;
+            margin-left: 20px;
+            background: #f7f7f7;
+            border-style: solid;
+            border-width: 1px;
+            border-color: transparent #e1e1e1;
+        }
+
+        .loadmask>.skformula li:first-child {
+            width: 100px;
+            margin-left: 0;
+        }
+
+        .loadmask > .placeholder {
+            background: #fbfbfb;
+            width: 100%;
+            height: 100%;
+            font-size: 0;
+            border: 1px solid #dfdfdf;
+            white-space: nowrap;
+
+            -webkit-animation: flickerAnimation 2s infinite ease-in-out;
+            -moz-animation: flickerAnimation 2s infinite ease-in-out;
+            -o-animation: flickerAnimation 2s infinite ease-in-out;
+            animation: flickerAnimation 2s infinite ease-in-out;
+        }
+
+        .loadmask > .placeholder > .columns {
+            width: 100%;
+            height: 100%;
+            display: inline-block;
+            background: linear-gradient(90deg, #d5d5d5 0px, rgba(223,223,223,0) 1px) 0 0,
+                        linear-gradient(rgba(223,223,223,0) 19px, #d5d5d5 20px) 0 0,
+                        linear-gradient( #f1f1f1 0px, #f1f1f1 20px) 0 0 repeat-x;
+            background-size: 80px 20px;
+        }
+
+        .loadmask > .placeholder > .columns:first-child {
+            background: linear-gradient(#f1f1f1 19px, #d5d5d5 20px) 0 0;
+            background-size: 20px 20px;
+            width: 25px;
+        }
+
+        @keyframes flickerAnimation {
+            0%   { opacity:1; }
+            50%  { opacity:0.5; }
+            100% { opacity:1; }
+        }
+        @-o-keyframes flickerAnimation{
+            0%   { opacity:1; }
+            50%  { opacity:0.5; }
+            100% { opacity:1; }
+        }
+        @-moz-keyframes flickerAnimation{
+            0%   { opacity:1; }
+            50%  { opacity:0.5; }
+            100% { opacity:1; }
+        }
+        @-webkit-keyframes flickerAnimation{
+            0%   { opacity:1; }
+            50%  { opacity:0.5; }
+            100% { opacity:1; }
+        }
+    </style>
+
+    <script>
+        document.getElementsByTagName('html')[0].setAttribute('style', 'zoom: ' + 1 / (window.devicePixelRatio < 2 ? window.devicePixelRatio : window.devicePixelRatio / 2) + ';');
+
+        var userAgent = navigator.userAgent.toLowerCase(),
+            check = function(regex){ return regex.test(userAgent); },
+            stopLoading = false;
+        if (!check(/opera/) && (check(/msie/) || check(/trident/))) {
+            var m = /msie (\d+\.\d+)/.exec(userAgent);
+            if (m && parseFloat(m[1]) < 10.0) {
+                document.write('<div class="app-error-panel">' +
+                                '<div class="message-block">' +
+                                    '<div class="message-inner">' +
+                                        '<div class="title">Your browser is not supported.</div>' +
+                                        '<div class="text">Sorry, Spreadsheet Editor is currently only supported in the latest versions of the Chrome, Firefox, Safari or Internet Explorer web browsers.</div>' +
+                                    '</div>' +
+                                '</div></div>');
+                stopLoading = true;
+            }
+        } else
+        if (check(/windows\snt/i)) {
+            var re = /chrome\/(\d+)/i.exec(userAgent);
+            if (!!re && !!re[1] && !(re[1] > 49)) {
+                setTimeout(function () {
+                    document.getElementsByTagName('body')[0].className += "winxp";
+                },0);
+            }
+        }
+
+        function getUrlParams() {
+            var e,
+                a = /\+/g,  // Regex for replacing addition symbol with a space
+                r = /([^&=]+)=?([^&]*)/g,
+                d = function (s) { return decodeURIComponent(s.replace(a, " ")); },
+                q = window.location.search.substring(1),
+                urlParams = {};
+
+            while (e = r.exec(q))
+                urlParams[d(e[1])] = d(e[2]);
+
+            return urlParams;
+        }
+
+        function encodeUrlParam(str) {
+            return str.replace(/&/g, '&amp;')
+                    .replace(/"/g, '&quot;')
+                    .replace(/'/g, '&#39;')
+                    .replace(/</g, '&lt;')
+                    .replace(/>/g, '&gt;');
+        }
+
+        var params = getUrlParams(),
+            lang = (params["lang"] || 'en').split(/[\-\_]/)[0];
+
+        window.frameEditorId = params["frameEditorId"];
+        window.parentOrigin = params["parentOrigin"];
+
+        if ( window.AscDesktopEditor ) {
+            window.desktop = window.AscDesktopEditor;
+            window.on_native_message = function (cmd, param) {
+                !window.native_message_cmd && (window.native_message_cmd = []);
+                window.native_message_cmd[cmd] = param;
+            }
+        }
+    </script>
+
+    <link rel="stylesheet" type="text/css" href="../../../../sdkjs/cell/css/main.css"/>
+    <link rel="stylesheet" type="text/css" href="../../../apps/spreadsheeteditor/main/resources/css/app.css">
+</head>
+<body>
+    <div id="loading-mask" class="loadmask">
+        <div class="skformula">
+            <ul><li/><li/></ul>
+        </div>
+        <div class="placeholder">
+            <div class="columns"></div><div class="columns"></div>
+        </div>
+    </div>
+
+    <div id="viewport"></div>
+
+    <script>
+        if (stopLoading) {
+            document.body.removeChild(document.getElementById('loading-mask'));
+        }
+    </script>
+
+    <script>
+        window.requireTimeourError = function(){
+            var reqerr;
+
+            if ( lang == 'de')      reqerr = 'Die Verbindung ist zu langsam, einige Komponenten konnten nicht geladen werden. Aktualisieren Sie bitte die Seite.';
+            else if ( lang == 'es') reqerr = 'La conexión es muy lenta, algunos de los componentes no han podido cargar. Por favor recargue la página.';
+            else if ( lang == 'fr') reqerr = 'La connexion est trop lente, certains des composants n\'ons pas pu être chargé. Veuillez recharger la page.';
+            else if ( lang == 'ru') reqerr = 'Слишком медленное соединение, не удается загрузить некоторые компоненты. Пожалуйста, обновите страницу.';
+            else reqerr = 'The connection is too slow, some of the components could not be loaded. Please reload the page.';
+
+            return reqerr;
+        };
+
+        var requireTimeoutID = setTimeout(function(){
+            window.alert(window.requireTimeourError());
+            window.location.reload();
+        }, 30000);
+
+        var require = {
+            waitSeconds: 30,
+            callback: function(){
+                clearTimeout(requireTimeoutID);
+            }
+        };
+    </script>
+
+    <!--<inline src="resources/img/header/buttons.svg" />-->
+    <inline src="resources/img/toolbar/charttypes.svg" />
+
+    <script data-main="app" src="../../../vendor/requirejs/require.js"></script>
+</body>
+</html>
\ No newline at end of file
diff --git a/build/spreadsheeteditor.json b/build/spreadsheeteditor.json
index 8c95362b89..9001b36439 100644
--- a/build/spreadsheeteditor.json
+++ b/build/spreadsheeteditor.json
@@ -188,6 +188,10 @@
                 {
                     "src": "../apps/spreadsheeteditor/main/index_loader.html.deploy",
                     "dest": "../deploy/web-apps/apps/spreadsheeteditor/main/index_loader.html"
+                },
+                {
+                    "src": "../apps/spreadsheeteditor/main/index_internal.html.deploy",
+                    "dest": "../deploy/web-apps/apps/spreadsheeteditor/main/index_internal.html"
                 }
             ]
         },
