diff --git a/apps/spreadsheeteditor/main/app/controller/DataTab.js b/apps/spreadsheeteditor/main/app/controller/DataTab.js
index c09d9ac0d..5fe81fb6b 100644
--- a/apps/spreadsheeteditor/main/app/controller/DataTab.js
+++ b/apps/spreadsheeteditor/main/app/controller/DataTab.js
@@ -43,7 +43,8 @@ define([
     'core',
     'spreadsheeteditor/main/app/view/DataTab',
     'spreadsheeteditor/main/app/view/GroupDialog',
-    'spreadsheeteditor/main/app/view/SortDialog'
+    'spreadsheeteditor/main/app/view/SortDialog',
+    'spreadsheeteditor/main/app/view/RemoveDuplicatesDialog'
 ], function () {
     'use strict';
 
@@ -88,7 +89,8 @@ define([
                     'data:show': this.onShowClick,
                     'data:hide': this.onHideClick,
                     'data:groupsettings': this.onGroupSettings,
-                    'data:sortcustom': this.onCustomSort
+                    'data:sortcustom': this.onCustomSort,
+                    'data:remduplicates': this.onRemoveDuplicates
                 },
                 'Statusbar': {
                     'sheet:changed': this.onApiSheetChanged
@@ -258,6 +260,49 @@ define([
             }
         },
 
+        onRemoveDuplicates: function() {
+            var me = this;
+            if (this.api) {
+                var res = this.api.asc_sortCellsRangeExpand();
+                if (res) {
+                    var config = {
+                        width: 500,
+                        title: this.txtRemDuplicates,
+                        msg: this.txtExpandRemDuplicates,
+
+                        buttons: [  {caption: this.txtExpand, primary: true, value: 'expand'},
+                            {caption: this.txtRemSelected, primary: true, value: 'remove'},
+                            'cancel'],
+                        callback: function(btn){
+                            if (btn == 'expand' || btn == 'remove') {
+                                setTimeout(function(){
+                                    me.showRemDuplicates(btn == 'expand');
+                                },1);
+                            }
+                        }
+                    };
+                    Common.UI.alert(config);
+                } else
+                    me.showRemDuplicates(res !== null);
+            }
+        },
+
+        showRemDuplicates: function(expand) {
+            var me = this,
+                props = me.api.asc_getRemoveDuplicates(expand);
+            if (props) {
+                (new SSE.Views.RemoveDuplicatesDialog({
+                    props: props,
+                    api: me.api,
+                    handler: function (result, settings) {
+                        if (me && me.api) {
+                            me.api.asc_setRemoveDuplicates(settings, result != 'ok');
+                        }
+                    }
+                })).show();
+            }
+        },
+
         onWorksheetLocked: function(index,locked) {
             if (index == this.api.asc_getActiveWorksheetIndex()) {
                 Common.Utils.lockControls(SSE.enumLock.sheetLock, locked, {array: this.view.btnsSortDown.concat(this.view.btnsSortUp, this.view.btnCustomSort, this.view.btnGroup, this.view.btnUngroup)});
@@ -271,7 +316,11 @@ define([
             this.onWorksheetLocked(currentSheet, this.api.asc_isWorksheetLockedOrDeleted(currentSheet));
         },
 
-        textWizard: 'Text to Columns Wizard'
+        textWizard: 'Text to Columns Wizard',
+        txtRemDuplicates: 'Remove Duplicates',
+        txtExpandRemDuplicates: 'The data next to the selection will not be removed. Do you want to expand the selection to include the adjacent data or continue with the currently selected cells only?',
+        txtExpand: 'Expand',
+        txtRemSelected: 'Remove in selected'
 
     }, SSE.Controllers.DataTab || {}));
 });
\ No newline at end of file
diff --git a/apps/spreadsheeteditor/main/app/template/Toolbar.template b/apps/spreadsheeteditor/main/app/template/Toolbar.template
index 0cc1fe7b9..958f2d26d 100644
--- a/apps/spreadsheeteditor/main/app/template/Toolbar.template
+++ b/apps/spreadsheeteditor/main/app/template/Toolbar.template
@@ -205,6 +205,7 @@
                 <div class="separator long"></div>
                 <div class="group">
                     <span class="btn-slot text x-huge" id="slot-btn-text-column"></span>
+                    <span class="btn-slot text x-huge" id="slot-btn-rem-duplicates"></span>
                 </div>
                 <div class="separator long"></div>
                 <div class="group">
diff --git a/apps/spreadsheeteditor/main/app/view/DataTab.js b/apps/spreadsheeteditor/main/app/view/DataTab.js
index 5b2f59a8d..9475023bd 100644
--- a/apps/spreadsheeteditor/main/app/view/DataTab.js
+++ b/apps/spreadsheeteditor/main/app/view/DataTab.js
@@ -66,6 +66,9 @@ define([
             me.btnTextToColumns.on('click', function (b, e) {
                 me.fireEvent('data:tocolumns');
             });
+            me.btnRemoveDuplicates.on('click', function (b, e) {
+                me.fireEvent('data:remduplicates');
+            });
             // isn't used for awhile
             // me.btnShow.on('click', function (b, e) {
             //     me.fireEvent('data:show');
@@ -166,6 +169,16 @@ define([
                 // Common.Utils.injectComponent($host.find('#slot-btn-hide-details'), this.btnHide);
                 // this.lockedControls.push(this.btnHide);
 
+                this.btnRemoveDuplicates = new Common.UI.Button({
+                    cls: 'btn-toolbar x-huge icon-top',
+                    iconCls: 'toolbar__icon btn-custom-sort',
+                    caption: this.capBtnTextRemDuplicates,
+                    disabled: true,
+                    lock: [_set.editCell, _set.selChart, _set.selChartText, _set.selShape, _set.selShapeText, _set.selImage, _set.lostConnect, _set.coAuth, _set.ruleFilter, _set.editPivot, _set.cantModifyFilter, _set.sheetLock]
+                });
+                Common.Utils.injectComponent($host.find('#slot-btn-rem-duplicates'), this.btnRemoveDuplicates);
+                this.lockedControls.push(this.btnRemoveDuplicates);
+
                 this.btnCustomSort = new Common.UI.Button({
                     cls: 'btn-toolbar x-huge icon-top',
                     iconCls: 'toolbar__icon btn-custom-sort',
@@ -226,6 +239,7 @@ define([
                     me.btnGroup.setMenu(_menu);
 
                     me.btnTextToColumns.updateHint(me.tipToColumns);
+                    me.btnRemoveDuplicates.updateHint(me.tipRemDuplicates);
 
                     me.btnsSortDown.forEach( function(btn) {
                         btn.updateHint(me.toolbar.txtSortAZ);
@@ -290,7 +304,9 @@ define([
             textBelow: 'Summary rows below detail',
             textRightOf: 'Summary columns to right of detail',
             capBtnTextCustomSort: 'Custom Sort',
-            tipCustomSort: 'Custom sort'
+            tipCustomSort: 'Custom sort',
+            capBtnTextRemDuplicates: 'Remove Duplicates',
+            tipRemDuplicates: 'Remove duplicate rows from a sheet'
         }
     }()), SSE.Views.DataTab || {}));
 });
diff --git a/apps/spreadsheeteditor/main/app/view/RemoveDuplicatesDialog.js b/apps/spreadsheeteditor/main/app/view/RemoveDuplicatesDialog.js
new file mode 100644
index 000000000..4e476bd2c
--- /dev/null
+++ b/apps/spreadsheeteditor/main/app/view/RemoveDuplicatesDialog.js
@@ -0,0 +1,303 @@
+/*
+ *
+ * (c) Copyright Ascensio System SIA 2010-2020
+ *
+ * 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
+ *
+ */
+/**
+ *  RemoveDuplicatesDialog.js
+ *
+ *  Created by Julia Radzhabova on 07.04.2020
+ *  Copyright (c) 2020 Ascensio System SIA. All rights reserved.
+ *
+ */
+
+define([
+    'common/main/lib/component/Window',
+    'common/main/lib/component/ComboBox',
+    'common/main/lib/component/ListView'
+], function () {
+    'use strict';
+
+    SSE.Views.RemoveDuplicatesDialog = Common.UI.Window.extend(_.extend({
+        options: {
+            width: 350,
+            style: 'min-width: 230px;',
+            cls: 'modal-dlg',
+            buttons: ['ok', 'cancel']
+        },
+
+        initialize : function (options) {
+            var t = this,
+                _options = {};
+
+            _.extend(this.options, {
+                title: this.txtTitle
+            }, options || {});
+
+            this.template = [
+                '<div class="box" style="height: 265px;">',
+                    '<div style="margin-bottom: 16px;">',
+                        '<label>' + this.textDescription + '</label>',
+                    '</div>',
+                    '<div class="input-row">',
+                        '<div id="rem-duplicates-dlg-headers"></div>',
+                    '</div>',
+                    '<div class="input-row">',
+                        '<label style="font-weight: bold;">' + this.textColumns + '</label>',
+                    '</div>',
+                    '<div id="rem-duplicates-dlg-columns" class="" style="width: 100%; height: 165px; overflow: hidden;"></div>',
+                '</div>'
+            ].join('');
+
+            this.options.tpl = _.template(this.template)(this.options);
+            this.api = this.options.api;
+            this.props = this.options.props;
+            this.handler =   this.options.handler;
+
+            Common.UI.Window.prototype.initialize.call(this, this.options);
+        },
+        render: function () {
+            Common.UI.Window.prototype.render.call(this);
+
+            this.chHeaders = new Common.UI.CheckBox({
+                el: $('#rem-duplicates-dlg-headers'),
+                labelText: this.textHeaders
+            });
+            this.chHeaders.on('change', _.bind(function(field, newValue, oldValue, eOpts){
+                this.props.asc_setHasHeaders(field.getValue()=='checked');
+                this.props.asc_updateColumnList();
+                this.updateColumnsList();
+            }, this));
+
+            this.columnsList = new Common.UI.ListView({
+                el: $('#rem-duplicates-dlg-columns', this.$window),
+                store: new Common.UI.DataViewStore(),
+                simpleAddMode: true,
+                scrollAlwaysVisible: true,
+                template: _.template(['<div class="listview inner" style=""></div>'].join('')),
+                itemTemplate: _.template([
+                    '<div>',
+                        '<label class="checkbox-indeterminate" style="position:absolute;">',
+                            '<input id="rdcheckbox-<%= id %>" type="checkbox" class="button__checkbox">',
+                            '<label for="rdcheckbox-<%= id %>" class="checkbox__shape" />',
+                        '</label>',
+                        '<div id="<%= id %>" class="list-item" style="pointer-events:none; margin-left: 20px;display: flex;">',
+                            '<div style="flex-grow: 1;"><%= Common.Utils.String.htmlEncode(value) %></div>',
+                        '</div>',
+                    '</div>'
+                ].join(''))
+            });
+            this.columnsList.on({
+                'item:change': this.onItemChanged.bind(this),
+                'item:add': this.onItemChanged.bind(this),
+                'item:select': this.onCellCheck.bind(this)
+            });
+            this.columnsList.onKeyDown = _.bind(this.onListKeyDown, this);
+
+            this.$window.find('.dlg-btn').on('click', _.bind(this.onBtnClick, this));
+            this.afterRender();
+        },
+
+        updateColumnsList: function() {
+            var selectAllState = false,
+                selectedCells = 0,
+                arr = [],
+                store = this.columnsList.store;
+
+            if (store.length<1) {
+                this.props.asc_getColumnList().forEach(function (item, index) {
+                    var visible = item.asc_getVisible();
+                    arr.push(new Common.UI.DataViewModel({
+                        id              : index,
+                        selected        : false,
+                        allowSelected   : true,
+                        value           : item.asc_getVal(),
+                        groupid         : '1',
+                        check           : visible
+                    }));
+                    if (visible) selectedCells++;
+                });
+
+                if (selectedCells==arr.length) selectAllState = true;
+                else if (selectedCells>0) selectAllState = 'indeterminate';
+
+                if (arr.length>0)
+                    arr.unshift(new Common.UI.DataViewModel({
+                        id              : arr.length,
+                        selected        : false,
+                        allowSelected   : true,
+                        value           : this.textSelectAll,
+                        groupid         : '0',
+                        check           : selectAllState,
+                        throughIndex    : 0
+                    }));
+                this.columnsList.store.reset(arr);
+                this.columnsList.scroller.update({minScrollbarLength  : 40, alwaysVisibleY: true, suppressScrollX: true});
+            } else {
+                this.props.asc_getColumnList().forEach(function (item, index) {
+                    store.at(index+1).set('value', item.asc_getVal());
+                });
+            }
+        },
+
+        onItemChanged: function (view, record) {
+            var state = record.model.get('check');
+            if ( state == 'indeterminate' )
+                $('input[type=checkbox]', record.$el).prop('indeterminate', true);
+            else $('input[type=checkbox]', record.$el).prop({checked: state, indeterminate: false});
+        },
+
+        onCellCheck: function (listView, itemView, record) {
+            if (this.checkCellTrigerBlock)
+                return;
+
+            var target = '', isLabel = false, bound = null;
+
+            var event = window.event ? window.event : window._event;
+            if (event) {
+                target = $(event.currentTarget).find('.list-item');
+
+                if (target.length) {
+                    bound = target.get(0).getBoundingClientRect();
+                    var _clientX = event.clientX*Common.Utils.zoom(),
+                        _clientY = event.clientY*Common.Utils.zoom();
+                    if (bound.left < _clientX && _clientX < bound.right &&
+                        bound.top < _clientY && _clientY < bound.bottom) {
+                        isLabel = true;
+                    }
+                }
+
+                if (isLabel || event.target.className.match('checkbox')) {
+                    this.updateCellCheck(listView, record);
+
+                    _.delay(function () {
+                        listView.$el.find('.listview').focus();
+                    }, 100, this);
+                }
+            }
+        },
+
+        onListKeyDown: function (e, data) {
+            var record = null, listView = this.columnsList;
+
+            if (listView.disabled) return;
+            if (_.isUndefined(undefined)) data = e;
+
+            if (data.keyCode == Common.UI.Keys.SPACE) {
+                data.preventDefault();
+                data.stopPropagation();
+
+                this.updateCellCheck(listView, listView.getSelectedRec());
+
+            } else {
+                Common.UI.DataView.prototype.onKeyDown.call(this.columnsList, e, data);
+            }
+        },
+
+        updateCellCheck: function (listView, record) {
+            if (record && listView) {
+                var store = listView.store,
+                    check = !record.get('check'),
+                    me = this;
+                if ('0' == record.get('groupid')) {
+                    store.each(function(cell) {
+                        cell.set('check', check);
+                    });
+                } else {
+                    record.set('check', check);
+                    var selectAllState = check;
+                    for (var i=0; i< store.length; i++) {
+                        var cell = store.at(i);
+                        if ('1' == cell.get('groupid') && cell.get('check') !== check) {
+                            selectAllState = 'indeterminate';
+                            break;
+                        }
+                    }
+                    this.checkCellTrigerBlock = true;
+                    store.at(0).set('check', selectAllState);
+                    this.checkCellTrigerBlock = undefined;
+                }
+
+                listView.scroller.update({minScrollbarLength  : 40, alwaysVisibleY: true, suppressScrollX: true});
+            }
+        },
+
+        afterRender: function() {
+            this._setDefaults(this.props);
+        },
+
+        _setDefaults: function (props) {
+            if (props) {
+                this.chHeaders.setValue(!!props.asc_getHasHeaders(), true);
+                this.updateColumnsList();
+            }
+        },
+
+        getSettings: function () {
+            var store = this.columnsList.store,
+                props = this.props.asc_getColumnList();
+            store.each(function(item, index) {
+                if ('1' == item.get('groupid')) {
+                    props[index-1].asc_setVisible(item.get('check'));
+                }
+            });
+            return this.props;
+        },
+
+        onBtnClick: function(event) {
+            this._handleInput(event.currentTarget.attributes['result'].value);
+        },
+
+        onDblClickFormat: function () {
+            this._handleInput('ok');
+        },
+
+        onPrimary: function(event) {
+            this._handleInput('ok');
+            return false;
+        },
+
+        _handleInput: function(state) {
+            if (this.options.handler) {
+                this.options.handler.call(this, state, (state == 'ok') ? this.getSettings() : this.props);
+            }
+
+            this.close();
+        },
+
+        //
+        txtTitle: 'Remove Duplicates',
+        textDescription: 'To delete duplicate values, select one or more columns than contain duplicates.',
+        textHeaders: 'My data has headers',
+        textColumns: 'Columns',
+        textSelectAll       : 'Select All'
+        
+    }, SSE.Views.RemoveDuplicatesDialog || {}));
+});
\ No newline at end of file