diff --git a/apps/api/documents/api.js b/apps/api/documents/api.js
index 25ea36fadf..f70d1565f4 100644
--- a/apps/api/documents/api.js
+++ b/apps/api/documents/api.js
@@ -208,6 +208,7 @@
         _config.editorConfig.canRequestSaveAs = _config.events && !!_config.events.onRequestSaveAs;
         _config.editorConfig.canRequestInsertImage = _config.events && !!_config.events.onRequestInsertImage;
         _config.editorConfig.canRequestMailMergeRecipients = _config.events && !!_config.events.onRequestMailMergeRecipients;
+        _config.editorConfig.canRequestCompareFile = _config.events && !!_config.events.onRequestCompareFile;
         _config.frameEditorId = placeholderId;
 
         var onMouseUp = function (evt) {
@@ -577,6 +578,13 @@
             });
         };
 
+        var _setRevisedFile = function(data) {
+            _sendCommand({
+                command: 'setRevisedFile',
+                data: data
+            });
+        };
+
         var _processMouse = function(evt) {
             var r = iframe.getBoundingClientRect();
             var data = {
@@ -621,7 +629,8 @@
             showSharingSettings : _showSharingSettings,
             setSharingSettings  : _setSharingSettings,
             insertImage         : _insertImage,
-            setMailMergeRecipients: _setMailMergeRecipients
+            setMailMergeRecipients: _setMailMergeRecipients,
+            setRevisedFile      : _setRevisedFile
         }
     };
 
diff --git a/apps/common/Gateway.js b/apps/common/Gateway.js
index b8e90ebada..6d45aa3a75 100644
--- a/apps/common/Gateway.js
+++ b/apps/common/Gateway.js
@@ -118,6 +118,10 @@ if (Common === undefined) {
 
             'setMailMergeRecipients': function(data) {
                 $me.trigger('setmailmergerecipients', data);
+            },
+
+            'setRevisedFile': function(data) {
+                $me.trigger('setrevisedfile', data);
             }
         };
 
@@ -308,6 +312,10 @@ if (Common === undefined) {
                 _postMessage({event:'onRequestMailMergeRecipients'})
             },
 
+            requestCompareFile:  function () {
+                _postMessage({event:'onRequestCompareFile'})
+            },
+
             on: function(event, handler){
                 var localHandler = function(event, data){
                     handler.call(me, data)
diff --git a/apps/common/main/lib/controller/ReviewChanges.js b/apps/common/main/lib/controller/ReviewChanges.js
index 52901cea57..3be1d3449f 100644
--- a/apps/common/main/lib/controller/ReviewChanges.js
+++ b/apps/common/main/lib/controller/ReviewChanges.js
@@ -78,7 +78,8 @@ define([
                     'reviewchange:reject':      _.bind(this.onRejectClick, this),
                     'reviewchange:delete':      _.bind(this.onDeleteClick, this),
                     'reviewchange:preview':     _.bind(this.onBtnPreviewClick, this),
-                    'reviewchanges:view':       _.bind(this.onReviewViewClick, this),
+                    'reviewchange:view':        _.bind(this.onReviewViewClick, this),
+                    'reviewchange:compare':     _.bind(this.onCompareClick, this),
                     'lang:document':            _.bind(this.onDocLanguage, this),
                     'collaboration:coauthmode': _.bind(this.onCoAuthMode, this)
                 },
@@ -99,7 +100,7 @@ define([
             this.collection     =   this.getApplication().getCollection('Common.Collections.ReviewChanges');
             this.userCollection =   this.getApplication().getCollection('Common.Collections.Users');
 
-            this._state = {posx: -1000, posy: -1000, popoverVisible: false, previewMode: false};
+            this._state = {posx: -1000, posy: -1000, popoverVisible: false, previewMode: false, compareSettings: null /*new AscCommon.CComparisonPr()*/};
 
             Common.NotificationCenter.on('reviewchanges:turn', this.onTurnPreview.bind(this));
             Common.NotificationCenter.on('spelling:turn', this.onTurnSpelling.bind(this));
@@ -127,8 +128,13 @@ define([
                 if (this.appConfig.canReview || this.appConfig.canViewReview) {
                     this.api.asc_registerCallback('asc_onShowRevisionsChange', _.bind(this.onApiShowChange, this));
                     this.api.asc_registerCallback('asc_onUpdateRevisionsChangesPosition', _.bind(this.onApiUpdateChangePosition, this));
+                    this.api.asc_registerCallback('asc_onAuthParticipantsChanged', _.bind(this.onAuthParticipantsChanged, this));
+                    this.api.asc_registerCallback('asc_onParticipantsChanged',     _.bind(this.onAuthParticipantsChanged, this));
                 }
+                this.api.asc_registerCallback('asc_onAcceptChangesBeforeCompare',_.bind(this.onAcceptChangesBeforeCompare, this));
                 this.api.asc_registerCallback('asc_onCoAuthoringDisconnect',_.bind(this.onCoAuthoringDisconnect, this));
+
+                Common.Gateway.on('setrevisedfile', _.bind(this.setRevisedFile, this));
             }
         },
 
@@ -568,6 +574,84 @@ define([
             Common.NotificationCenter.trigger('edit:complete', this.view);
         },
 
+        onCompareClick: function(item) {
+            if (this.api) {
+                var me = this;
+                if (!this._state.compareSettings) {
+                    this._state.compareSettings = new AscCommonWord.ComparisonOptions();
+                    this._state.compareSettings.putWords(!Common.localStorage.getBool("de-compare-char"));
+                }
+                if (item === 'file') {
+                    if (this.api)
+                        this.api.asc_CompareDocumentFile(this._state.compareSettings);
+                    Common.NotificationCenter.trigger('edit:complete', this.view);
+                } else if (item === 'url') {
+                    (new Common.Views.ImageFromUrlDialog({
+                        title: me.textUrl,
+                        handler: function(result, value) {
+                            if (result == 'ok') {
+                                if (me.api) {
+                                    var checkUrl = value.replace(/ /g, '');
+                                    if (!_.isEmpty(checkUrl)) {
+                                        me.api.asc_CompareDocumentUrl(checkUrl, me._state.compareSettings);
+                                    }
+                                }
+                                Common.NotificationCenter.trigger('edit:complete', me.view);
+                            }
+                        }
+                    })).show();
+                } else if (item === 'storage') {
+                    if (this.appConfig.canRequestCompareFile) {
+                        Common.Gateway.requestCompareFile();
+                    } else {
+                        (new Common.Views.SelectFileDlg({
+                            fileChoiceUrl: this.appConfig.fileChoiceUrl.replace("{fileExt}", "").replace("{documentType}", "DocumentsOnly")
+                        })).on('selectfile', function(obj, file){
+                            me.setRevisedFile(file, me._state.compareSettings);
+                        }).show();
+                    }
+                } else if (item === 'settings') {
+                    (new DE.Views.CompareSettingsDialog({
+                        props: me._state.compareSettings,
+                        handler: function(result, value) {
+                            if (result == 'ok') {
+                                me._state.compareSettings = value;
+                            }
+
+                            Common.NotificationCenter.trigger('edit:complete', me.toolbar);
+                        }
+                    })).show();
+                }
+            }
+            Common.NotificationCenter.trigger('edit:complete', this.view);
+        },
+
+        setRevisedFile: function(data) {
+            if (!this._state.compareSettings) {
+                this._state.compareSettings = new AscCommonWord.ComparisonOptions();
+                this._state.compareSettings.putWords(!Common.localStorage.getBool("de-compare-char"));
+            }
+            if (data && data.url) {
+                this.api.asc_CompareDocumentUrl(data.url, this._state.compareSettings, data.token);// for loading from storage
+            }
+        },
+
+        onAcceptChangesBeforeCompare: function(callback) {
+            var me = this;
+            Common.UI.warning({
+                width: 550,
+                msg: this.textAcceptBeforeCompare,
+                buttons: ['yes', 'no'],
+                primary: 'yes',
+                callback: function(result) {
+                    _.defer(function() {
+                        if (callback) callback(result=='yes');
+                    });
+                    Common.NotificationCenter.trigger('edit:complete', this.view);
+                }
+            });
+        },
+
         turnDisplayMode: function(mode) {
             if (this.api) {
                 if (mode === 'final')
@@ -780,6 +864,17 @@ define([
             });
         },
 
+        onAuthParticipantsChanged: function(users) {
+            if (this.view && this.view.btnCompare) {
+                var length = 0;
+                _.each(users, function(item){
+                    if (!item.asc_getView())
+                        length++;
+                });
+                this.view.btnCompare.setDisabled(length>1 || this.viewmode);
+            }
+        },
+
         commentsShowHide: function(mode) {
             if (!this.view) return;
             var value = Common.Utils.InternalSettings.get(this.view.appPrefix + "settings-livecomment");
@@ -844,6 +939,8 @@ define([
         textTableRowsDel: '<b>Table Rows Deleted<b/>',
         textParaMoveTo: '<b>Moved:</b>',
         textParaMoveFromUp: '<b>Moved Up:</b>',
-        textParaMoveFromDown: '<b>Moved Down:</b>'
+        textParaMoveFromDown: '<b>Moved Down:</b>',
+        textUrl: 'Paste a document URL',
+        textAcceptBeforeCompare: 'In order to compare documents all the tracked changes in them will be considered to have been accepted. Do you want to continue?'
     }, Common.Controllers.ReviewChanges || {}));
 });
\ No newline at end of file
diff --git a/apps/common/main/lib/view/ImageFromUrlDialog.js b/apps/common/main/lib/view/ImageFromUrlDialog.js
index beffb0fc8f..0287417f01 100644
--- a/apps/common/main/lib/view/ImageFromUrlDialog.js
+++ b/apps/common/main/lib/view/ImageFromUrlDialog.js
@@ -56,7 +56,7 @@ define([
             this.template = [
                 '<div class="box">',
                     '<div class="input-row">',
-                        '<label>' + this.textUrl + '</label>',
+                        '<label>' + (this.options.title || this.textUrl) + '</label>',
                     '</div>',
                     '<div id="id-dlg-url" class="input-row"></div>',
                 '</div>'
diff --git a/apps/common/main/lib/view/ReviewChanges.js b/apps/common/main/lib/view/ReviewChanges.js
index f249412113..b8943753d0 100644
--- a/apps/common/main/lib/view/ReviewChanges.js
+++ b/apps/common/main/lib/view/ReviewChanges.js
@@ -80,6 +80,10 @@ define([
                     '<span id="btn-change-reject" class="btn-slot text x-huge"></span>' +
                 '</div>' +
                 '<div class="separator long review"/>' +
+                '<div class="group">' +
+                    '<span id="btn-compare" class="btn-slot text x-huge"></span>' +
+                '</div>' +
+                '<div class="separator long compare"/>' +
                 '<div class="group no-group-mask">' +
                     '<span id="slot-btn-chat" class="btn-slot text x-huge"></span>' +
                 '</div>' +
@@ -116,6 +120,16 @@ define([
                     me.fireEvent('reviewchange:reject', [menu, item]);
                 });
 
+                if (me.appConfig.canFeatureComparison) {
+                    this.btnCompare.on('click', function (e) {
+                        me.fireEvent('reviewchange:compare', ['file']);
+                    });
+
+                    this.btnCompare.menu.on('item:click', function (menu, item, e) {
+                        me.fireEvent('reviewchange:compare', [item.value]);
+                    });
+                }
+
                 this.btnsTurnReview.forEach(function (button) {
                     button.on('click', _click_turnpreview.bind(me));
                 });
@@ -130,7 +144,7 @@ define([
                 });
 
                 this.btnReviewView && this.btnReviewView.menu.on('item:click', function (menu, item, e) {
-                    me.fireEvent('reviewchanges:view', [menu, item]);
+                    me.fireEvent('reviewchange:view', [menu, item]);
                 });
             }
 
@@ -199,6 +213,14 @@ define([
                         iconCls: 'review-deny'
                     });
 
+                    if (this.appConfig.canFeatureComparison)
+                        this.btnCompare = new Common.UI.Button({
+                            cls         : 'btn-toolbar  x-huge icon-top',
+                            caption     : this.txtCompare,
+                            split       : true,
+                            iconCls: 'btn-compare'
+                        });
+
                     this.btnTurnOn = new Common.UI.Button({
                         cls: 'btn-toolbar x-huge icon-top',
                         iconCls: 'btn-ic-review',
@@ -368,6 +390,20 @@ define([
                         );
                         me.btnReject.updateHint([me.tipRejectCurrent, me.txtRejectChanges]);
 
+                        if (config.canFeatureComparison) {
+                            me.btnCompare.setMenu(new Common.UI.Menu({
+                                items: [
+                                    {caption: me.mniFromFile, value: 'file'},
+                                    {caption: me.mniFromUrl, value: 'url'},
+                                    {caption: me.mniFromStorage, value: 'storage'}
+                                    // ,{caption: '--'},
+                                    // {caption: me.mniSettings, value: 'settings'}
+                                ]
+                            }));
+                            me.btnCompare.menu.items[2].setVisible(me.appConfig.canRequestCompareFile || me.appConfig.fileChoiceUrl && me.appConfig.fileChoiceUrl.indexOf("{documentType}")>-1);
+                            me.btnCompare.updateHint(me.tipCompare);
+                        }
+
                         me.btnAccept.setDisabled(config.isReviewOnly);
                         me.btnReject.setDisabled(config.isReviewOnly);
                     }
@@ -442,6 +478,7 @@ define([
                     var separator_sharing = !(me.btnSharing || me.btnCoAuthMode) ? me.$el.find('.separator.sharing') : '.separator.sharing',
                         separator_comments = !(config.canComments && config.canCoAuthoring) ? me.$el.find('.separator.comments') : '.separator.comments',
                         separator_review = !(config.canReview || config.canViewReview) ? me.$el.find('.separator.review') : '.separator.review',
+                        separator_compare = !(config.canReview && config.canFeatureComparison) ? me.$el.find('.separator.compare') : '.separator.compare',
                         separator_chat = !me.btnChat ? me.$el.find('.separator.chat') : '.separator.chat',
                         separator_last;
 
@@ -460,6 +497,11 @@ define([
                     else
                         separator_last = separator_review;
 
+                    if (typeof separator_compare == 'object')
+                        separator_compare.hide().prev('.group').hide();
+                    else
+                        separator_last = separator_compare;
+
                     if (typeof separator_chat == 'object')
                         separator_chat.hide().prev('.group').hide();
                     else
@@ -480,6 +522,7 @@ define([
                 if ( this.appConfig.canReview ) {
                     this.btnAccept.render(this.$el.find('#btn-change-accept'));
                     this.btnReject.render(this.$el.find('#btn-change-reject'));
+                    this.appConfig.canFeatureComparison && this.btnCompare.render(this.$el.find('#btn-compare'));
                     this.btnTurnOn.render(this.$el.find('#btn-review-on'));
                 }
                 this.btnPrev && this.btnPrev.render(this.$el.find('#btn-change-prev'));
@@ -654,6 +697,12 @@ define([
             txtOriginalCap: 'Original',
             strFastDesc: 'Real-time co-editing. All changes are saved automatically.',
             strStrictDesc: 'Use the \'Save\' button to sync the changes you and others make.',
+            txtCompare: 'Compare',
+            tipCompare: 'Compare current document with another one',
+            mniFromFile: 'Document from File',
+            mniFromUrl: 'Document from URL',
+            mniFromStorage: 'Document from Storage',
+            mniSettings: 'Comparison Settings',
             txtCommentRemove: 'Remove',
             tipCommentRemCurrent: 'Remove current comments',
             tipCommentRem: 'Remove comments',
diff --git a/apps/common/main/resources/less/toolbar.less b/apps/common/main/resources/less/toolbar.less
index 74da8eb05b..67d8f706bc 100644
--- a/apps/common/main/resources/less/toolbar.less
+++ b/apps/common/main/resources/less/toolbar.less
@@ -533,6 +533,7 @@
 .button-normal-icon(btn-caption,            76, @toolbar-big-icon-size);
 .button-normal-icon(btn-calculation,        80, @toolbar-big-icon-size);
 .button-normal-icon(btn-scale,              81, @toolbar-big-icon-size);
+.button-normal-icon(btn-compare,            82, @toolbar-big-icon-size);
 .button-normal-icon(btn-rem-comment,        83, @toolbar-big-icon-size);
 .button-normal-icon(btn-symbol,             84, @toolbar-big-icon-size);
 
diff --git a/apps/documenteditor/main/app/controller/Main.js b/apps/documenteditor/main/app/controller/Main.js
index 34542c5c36..c75edb3b0f 100644
--- a/apps/documenteditor/main/app/controller/Main.js
+++ b/apps/documenteditor/main/app/controller/Main.js
@@ -352,8 +352,10 @@ define([
                 this.appOptions.canRequestSendNotify = this.editorConfig.canRequestSendNotify;
                 this.appOptions.canRequestSaveAs = this.editorConfig.canRequestSaveAs;
                 this.appOptions.canRequestInsertImage = this.editorConfig.canRequestInsertImage;
+                this.appOptions.canRequestCompareFile = this.editorConfig.canRequestCompareFile;
                 this.appOptions.canRequestMailMergeRecipients = this.editorConfig.canRequestMailMergeRecipients;
                 this.appOptions.compatibleFeatures = (typeof (this.appOptions.customization) == 'object') && !!this.appOptions.customization.compatibleFeatures;
+                this.appOptions.canFeatureComparison = !!this.api.asc_isSupportFeature("comparison");
 
                 appHeader = this.getApplication().getController('Viewport').getView('Common.Views.Header');
                 appHeader.setCanBack(this.appOptions.canBackToFolder === true, (this.appOptions.canBackToFolder) ? this.editorConfig.customization.goback.text : '')
@@ -1392,6 +1394,18 @@ define([
                         config.msg = this.uploadImageFileCountMessage;
                         break;
 
+                    case Asc.c_oAscError.ID.UplDocumentSize:
+                        config.msg = this.uploadDocSizeMessage;
+                        break;
+
+                    case Asc.c_oAscError.ID.UplDocumentExt:
+                        config.msg = this.uploadDocExtMessage;
+                        break;
+
+                    case Asc.c_oAscError.ID.UplDocumentFileCount:
+                        config.msg = this.uploadDocFileCountMessage;
+                        break;
+
                     case Asc.c_oAscError.ID.SplitCellMaxRows:
                         config.msg = this.splitMaxRowsErrorText.replace('%1', errData.get_Value());
                         break;
@@ -2170,7 +2184,7 @@ define([
             uploadImageTextText: 'Uploading image...',
             savePreparingText: 'Preparing to save',
             savePreparingTitle: 'Preparing to save. Please wait...',
-            uploadImageSizeMessage: 'Maximium image size limit exceeded.',
+            uploadImageSizeMessage: 'Maximum image size limit exceeded.',
             uploadImageExtMessage: 'Unknown image format.',
             uploadImageFileCountMessage: 'No images uploaded.',
             reloadButtonText: 'Reload Page',
@@ -2486,6 +2500,9 @@ define([
             txtMainDocOnly: 'Error! Main Document Only.',
             txtNotValidBookmark: 'Error! Not a valid bookmark self-reference.',
             txtNoText: 'Error! No text of specified style in document.',
+            uploadDocSizeMessage: 'Maximum document size limit exceeded.',
+            uploadDocExtMessage: 'Unknown document format.',
+            uploadDocFileCountMessage: 'No documents uploaded.',
             errorUpdateVersionOnDisconnect: 'Internet connection has been restored, and the file version has been changed.<br>Before you can continue working, you need to download the file or copy its content to make sure nothing is lost, and then reload this page.'
         }
     })(), DE.Controllers.Main || {}))
diff --git a/apps/documenteditor/main/app/controller/Toolbar.js b/apps/documenteditor/main/app/controller/Toolbar.js
index 1affbdbd8c..dfded77bd6 100644
--- a/apps/documenteditor/main/app/controller/Toolbar.js
+++ b/apps/documenteditor/main/app/controller/Toolbar.js
@@ -57,7 +57,8 @@ define([
     'documenteditor/main/app/controller/PageLayout',
     'documenteditor/main/app/view/CustomColumnsDialog',
     'documenteditor/main/app/view/ControlSettingsDialog',
-    'documenteditor/main/app/view/WatermarkSettingsDialog'
+    'documenteditor/main/app/view/WatermarkSettingsDialog',
+    'documenteditor/main/app/view/CompareSettingsDialog'
 ], function () {
     'use strict';
 
diff --git a/apps/documenteditor/main/app/view/CompareSettingsDialog.js b/apps/documenteditor/main/app/view/CompareSettingsDialog.js
new file mode 100644
index 0000000000..d7c9f84ba4
--- /dev/null
+++ b/apps/documenteditor/main/app/view/CompareSettingsDialog.js
@@ -0,0 +1,150 @@
+/*
+ *
+ * (c) Copyright Ascensio System SIA 2010-2019
+ *
+ * This program is a free software product. You can redistribute it and/or
+ * modify it under the terms of the GNU Affero General Public License (AGPL)
+ * version 3 as published by the Free Software Foundation. In accordance with
+ * Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect
+ * that Ascensio System SIA expressly excludes the warranty of non-infringement
+ * of any third-party rights.
+ *
+ * This program is distributed WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For
+ * details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
+ *
+ * You can contact Ascensio System SIA at 20A-12 Ernesta Birznieka-Upisha
+ * street, Riga, Latvia, EU, LV-1050.
+ *
+ * The  interactive user interfaces in modified source and object code versions
+ * of the Program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU AGPL version 3.
+ *
+ * Pursuant to Section 7(b) of the License you must retain the original Product
+ * logo when distributing the program. Pursuant to Section 7(e) we decline to
+ * grant you any rights under trademark law for use of our trademarks.
+ *
+ * All the Product's GUI elements, including illustrations and icon sets, as
+ * well as technical writing content are licensed under the terms of the
+ * Creative Commons Attribution-ShareAlike 4.0 International. See the License
+ * terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
+ *
+ */
+
+/**
+ *  CompareSettingsDialog.js.js
+ *
+ *  Created by Julia Radzhabova on 14.08.2019
+ *  Copyright (c) 2019 Ascensio System SIA. All rights reserved.
+ *
+ */
+
+define([
+    'common/main/lib/util/utils',
+    'common/main/lib/component/CheckBox',
+    'common/main/lib/component/InputField',
+    'common/main/lib/view/AdvancedSettingsWindow'
+], function () { 'use strict';
+
+    DE.Views.CompareSettingsDialog = Common.Views.AdvancedSettingsWindow.extend(_.extend({
+        options: {
+            contentWidth: 220,
+            height: 160
+        },
+
+        initialize : function(options) {
+            var me = this;
+
+            _.extend(this.options, {
+                title: this.textTitle,
+                template: [
+                    '<div class="box" style="height:' + (me.options.height - 85) + 'px;">',
+                        '<div class="content-panel" style="padding: 0 5px;"><div class="inner-content">',
+                            '<div class="settings-panel active">',
+                                '<table cols="1" style="width: 100%;">',
+                                '<tr>',
+                                    '<td class="padding-small">',
+                                        '<label class="header">', me.textShow, '</label>',
+                                    '</td>',
+                                '</tr>',
+                                '<tr>',
+                                    '<td class="padding-small">',
+                                        '<div id="compare-settings-radio-char"></div>',
+                                    '</td>',
+                                '</tr>',
+                                '<tr>',
+                                    '<td class="padding-small">',
+                                        '<div id="compare-settings-radio-word"></div>',
+                                    '</td>',
+                                '</tr>',
+                                '</table>',
+                            '</div></div>',
+                        '</div>',
+                    '</div>'
+                ].join('')
+            }, options);
+
+            this.handler    = options.handler;
+            this.props      = options.props;
+
+            Common.Views.AdvancedSettingsWindow.prototype.initialize.call(this, this.options);
+        },
+
+        render: function() {
+            Common.Views.AdvancedSettingsWindow.prototype.render.call(this);
+            var me = this;
+
+            this.radioChar = new Common.UI.RadioBox({
+                el: $('#compare-settings-radio-char'),
+                labelText: this.textChar,
+                name: 'asc-radio-compare-show'
+            });
+
+            this.radioWord = new Common.UI.RadioBox({
+                el: $('#compare-settings-radio-word'),
+                labelText: this.textWord,
+                name: 'asc-radio-compare-show'
+            });
+
+            this.afterRender();
+        },
+
+        afterRender: function() {
+            this._setDefaults(this.props);
+        },
+
+        show: function() {
+            Common.Views.AdvancedSettingsWindow.prototype.show.apply(this, arguments);
+        },
+
+        _setDefaults: function (props) {
+            if (props) {
+                var value = props.getWords();
+                (value==false) ? this.radioChar.setValue(true, true) : this.radioWord.setValue(true, true);
+            }
+        },
+
+        getSettings: function () {
+            var props   = new AscCommonWord.ComparisonOptions();
+            props.putWords(this.radioWord.getValue());
+            return props;
+        },
+
+        onDlgBtnClick: function(event) {
+            var me = this;
+            var state = (typeof(event) == 'object') ? event.currentTarget.attributes['result'].value : event;
+            if (state == 'ok') {
+                this.handler && this.handler.call(this, state, this.getSettings());
+                Common.localStorage.setBool("de-compare-char", this.radioChar.getValue());
+            }
+
+            this.close();
+        },
+
+        textTitle:    'Comparison Settings',
+        textShow: 'Show changes at',
+        textChar: 'Character level',
+        textWord: 'Word level'
+
+    }, DE.Views.CompareSettingsDialog || {}))
+});
\ No newline at end of file
diff --git a/apps/documenteditor/main/app/view/Toolbar.js b/apps/documenteditor/main/app/view/Toolbar.js
index ee80a4da94..f2d27a750b 100644
--- a/apps/documenteditor/main/app/view/Toolbar.js
+++ b/apps/documenteditor/main/app/view/Toolbar.js
@@ -2175,8 +2175,8 @@ define([
             tipBack: 'Back',
             tipInsertShape: 'Insert Autoshape',
             tipInsertEquation: 'Insert Equation',
-            mniImageFromFile: 'Image from file',
-            mniImageFromUrl: 'Image from url',
+            mniImageFromFile: 'Image from File',
+            mniImageFromUrl: 'Image from URL',
             mniCustomTable: 'Insert Custom Table',
             textTitleError: 'Error',
             textInsertPageNumber: 'Insert page number',
diff --git a/apps/documenteditor/main/locale/en.json b/apps/documenteditor/main/locale/en.json
index 3b2bac95ca..6e3f8ab30d 100644
--- a/apps/documenteditor/main/locale/en.json
+++ b/apps/documenteditor/main/locale/en.json
@@ -69,6 +69,8 @@
   "Common.Controllers.ReviewChanges.textTabs": "Change tabs",
   "Common.Controllers.ReviewChanges.textUnderline": "Underline",
   "Common.Controllers.ReviewChanges.textWidow": "Widow control",
+  "Common.Controllers.ReviewChanges.textUrl": "Paste a document URL",
+  "Common.Controllers.ReviewChanges.textAcceptBeforeCompare": "In order to compare documents all the tracked changes in them will be considered to have been accepted. Do you want to continue?",
   "Common.define.chartData.textArea": "Area",
   "Common.define.chartData.textBar": "Bar",
   "Common.define.chartData.textCharts": "Charts",
@@ -302,6 +304,12 @@
   "Common.Views.ReviewChanges.txtSpelling": "Spell Checking",
   "Common.Views.ReviewChanges.txtTurnon": "Track Changes",
   "Common.Views.ReviewChanges.txtView": "Display Mode",
+  "Common.Views.ReviewChanges.txtCompare": "Compare",
+  "Common.Views.ReviewChanges.tipCompare": "Compare current document with another one",
+  "Common.Views.ReviewChanges.mniFromFile": "Document from File",
+  "Common.Views.ReviewChanges.mniFromUrl": "Document from URL",
+  "Common.Views.ReviewChanges.mniFromStorage": "Document from Storage",
+  "Common.Views.ReviewChanges.mniSettings": "Comparison Settings",
   "Common.Views.ReviewChangesDialog.textTitle": "Review Changes",
   "Common.Views.ReviewChangesDialog.txtAccept": "Accept",
   "Common.Views.ReviewChangesDialog.txtAcceptAll": "Accept All Changes",
@@ -691,6 +699,9 @@
   "DE.Controllers.Main.txtZeroDivide": "Zero Divide",
   "DE.Controllers.Main.unknownErrorText": "Unknown error.",
   "DE.Controllers.Main.unsupportedBrowserErrorText": "Your browser is not supported.",
+  "DE.Controllers.Main.uploadDocSizeMessage": "Maximum document size limit exceeded.",
+  "DE.Controllers.Main.uploadDocExtMessage": "Unknown document format.",
+  "DE.Controllers.Main.uploadDocFileCountMessage": "No documents uploaded.",
   "DE.Controllers.Main.uploadImageExtMessage": "Unknown image format.",
   "DE.Controllers.Main.uploadImageFileCountMessage": "No images uploaded.",
   "DE.Controllers.Main.uploadImageSizeMessage": "Maximum image size limit exceeded.",
@@ -1115,6 +1126,10 @@
   "DE.Views.ChartSettings.txtTight": "Tight",
   "DE.Views.ChartSettings.txtTitle": "Chart",
   "DE.Views.ChartSettings.txtTopAndBottom": "Top and bottom",
+  "DE.Views.CompareSettingsDialog.textTitle": "Comparison Settings",
+  "DE.Views.CompareSettingsDialog.textShow": "Show changes at",
+  "DE.Views.CompareSettingsDialog.textChar": "Character level",
+  "DE.Views.CompareSettingsDialog.textWord": "Word level",
   "DE.Views.ControlSettingsDialog.textAppearance": "Appearance",
   "DE.Views.ControlSettingsDialog.textApplyAll": "Apply to All",
   "DE.Views.ControlSettingsDialog.textBox": "Bounding box",
diff --git a/apps/documenteditor/sdk_dev_scripts.js b/apps/documenteditor/sdk_dev_scripts.js
index c4de93a9ad..f0f246b885 100644
--- a/apps/documenteditor/sdk_dev_scripts.js
+++ b/apps/documenteditor/sdk_dev_scripts.js
@@ -13,6 +13,7 @@ var sdk_dev_scrpipts = [
 	"../../../../sdkjs/common/TableId.js",
 	"../../../../sdkjs/common/TableIdChanges.js",
 	"../../../../sdkjs/common/macros.js",
+	"../../../../sdkjs/common/delta.js",
 	"../../../../sdkjs/common/NumFormat.js",
     "../../../../sdkjs/common/SerializeChart.js",
     "../../../../sdkjs/common/AdvancedOptions.js",
@@ -91,6 +92,7 @@ var sdk_dev_scrpipts = [
     "../../../../sdkjs/word/Editor/GraphicObjects/WrapManager.js",
     "../../../../sdkjs/word/Editor/CollaborativeEditing.js",
 	"../../../../sdkjs/word/Editor/DocumentContentElementBase.js",
+	"../../../../sdkjs/word/Editor/DocumentComparison.js",
 	"../../../../sdkjs/word/Editor/ParagraphContentBase.js",
     "../../../../sdkjs/word/Editor/Comments.js",
 	"../../../../sdkjs/word/Editor/CommentsChanges.js",