diff --git a/addons/web/static/src/js/views/basic/basic_renderer.js b/addons/web/static/src/js/views/basic/basic_renderer.js
index d9c0f1a570b..f0d41f31f49 100644
--- a/addons/web/static/src/js/views/basic/basic_renderer.js
+++ b/addons/web/static/src/js/views/basic/basic_renderer.js
@@ -594,7 +594,7 @@ var BasicRenderer = AbstractRenderer.extend({
      */
     _renderWidget: function (record, node) {
         var Widget = widgetRegistry.get(node.attrs.name);
-        var widget = new Widget(this, record);
+        var widget = new Widget(this, record, node);
 
         // Prepare widget rendering and save the related deferred
         var def = widget._widgetRenderAndInsert(function () {});
diff --git a/addons/web/static/src/js/views/form/form_renderer.js b/addons/web/static/src/js/views/form/form_renderer.js
index b289663fb19..b28d25c5b90 100644
--- a/addons/web/static/src/js/views/form/form_renderer.js
+++ b/addons/web/static/src/js/views/form/form_renderer.js
@@ -370,6 +370,9 @@ var FormRenderer = BasicRenderer.extend({
             if (child.tag === 'button') {
                 $buttons.append(self._renderHeaderButton(child));
             }
+            if (child.tag === 'widget') {
+                $buttons.append(self._renderTagWidget(child));
+            }
         });
         return $buttons;
     },
diff --git a/addons/web/static/src/js/widgets/attach_document.js b/addons/web/static/src/js/widgets/attach_document.js
new file mode 100644
index 00000000000..041b021d60b
--- /dev/null
+++ b/addons/web/static/src/js/widgets/attach_document.js
@@ -0,0 +1,135 @@
+odoo.define('web.AttachDocument', function (require) {
+"use static";
+
+var core = require('web.core');
+var framework = require('web.framework');
+var widgetRegistry = require('web.widget_registry');
+var Widget = require('web.Widget');
+
+var _t = core._t;
+
+var AttachDocument = Widget.extend({
+    template: 'AttachDocument',
+    events: {
+        'click span.o_attach_document': '_onClickAttachDocument',
+        'change input.o_input_file': '_onFileChanged',
+    },
+    /**
+     * @constructor
+     * @param {Widget} parent
+     * @param {Object} record
+     * @param {Object} nodeInfo
+     */
+    init: function (parent, record, nodeInfo) {
+        this._super.apply(this, arguments);
+        this.res_id = record.res_id;
+        this.res_model = record.model;
+        this.state = record;
+        this.node = nodeInfo;
+        this.fileuploadID = _.uniqueId('o_fileupload');
+    },
+    /**
+     * @override
+     */
+    start: function () {
+        $(window).on(this.fileuploadID, this._onFileLoaded.bind(this));
+        return this._super.apply(this, arguments);
+    },
+    /**
+     * @override
+     */
+    destroy: function () {
+        $(window).off(this.fileuploadID);
+        this._super.apply(this, arguments);
+    },
+
+    //--------------------------------------------------------------------------
+    // private
+    //--------------------------------------------------------------------------
+
+    /**
+     * Helper function to display a warning that some fields have an invalid
+     * value. This is used when a save operation cannot be completed.
+     *
+     * @private
+     * @param {string[]} invalidFields - list of field names
+     */
+    _notifyInvalidFields: function (invalidFields) {
+        var fields = this.state.fields;
+        var warnings = invalidFields.map(function (fieldName) {
+            var fieldStr = fields[fieldName].string;
+            return _.str.sprintf('<li>%s</li>', _.escape(fieldStr));
+        });
+        warnings.unshift('<ul>');
+        warnings.push('</ul>');
+        this.do_warn(_t("The following fields are invalid:"), warnings.join(''));
+     },
+
+    //--------------------------------------------------------------------------
+    // Handlers
+    //--------------------------------------------------------------------------
+
+    /**
+     * Opens File Explorer dialog if all fields are valid and record is saved
+     *
+     * @private
+     * @param {Event} ev
+     */
+    _onClickAttachDocument: function (ev) {
+        var fieldNames = this.getParent().canBeSaved(this.state.id);
+        if (fieldNames.length) {
+            return this._notifyInvalidFields(fieldNames);
+        }
+        // We want to save record on widget click and then open File Selection Explorer
+        // but due to this security restriction give warning to save record first.
+        // https://stackoverflow.com/questions/29728705/trigger-click-on-input-file-on-asynchronous-ajax-done/29873845#29873845
+        if (!this.res_id) {
+            return this.do_warn(_t('Warning : You have to save first before attaching a file.'));
+        }
+        this.$('input.o_input_file').trigger('click');
+    },
+    /**
+     * Submits file
+     *
+     * @private
+     * @param {Event} ev
+     */
+    _onFileChanged: function (ev) {
+        ev.stopPropagation();
+        this.$('form.o_form_binary_form').trigger('submit');
+        framework.blockUI();
+    },
+    /**
+     * Call action given as node attribute after file submission
+     *
+     * @private
+     */
+    _onFileLoaded: function () {
+        var self = this,
+            def = $.Deferred();
+
+        if (self.node.attrs.action) {
+            // the first argument isn't a file but the jQuery.Event
+            var files = Array.prototype.slice.call(arguments, 1);
+            self._rpc({
+                model: self.res_model,
+                method: self.node.attrs.action,
+                args: [self.res_id],
+                kwargs: {
+                    'attachment_ids': _.map(files, function (file) {return file.id;}),
+                }
+            }).then( function () {
+                def.resolve();
+            });
+        } else {
+            def.resolve();
+        }
+        return $.when(def).then(function () {
+            self.trigger_up('reload');
+            framework.unblockUI();
+        });
+    },
+
+});
+widgetRegistry.add('attach_document', AttachDocument);
+});
diff --git a/addons/web/static/src/xml/base.xml b/addons/web/static/src/xml/base.xml
index 196346d4d9c..ce432fea823 100644
--- a/addons/web/static/src/xml/base.xml
+++ b/addons/web/static/src/xml/base.xml
@@ -1351,4 +1351,20 @@
     </div>
 </t>
 
+<t t-name="AttachDocument">
+    <button class="btn btn-sm btn-default o_attachment_button">
+        <span class="o_attach_document"><t t-esc="widget.node.attrs.string"/></span>
+        <span class="hide">
+            <t t-call="HiddenInputFile">
+                <t t-set="fileupload_id" t-value="widget.fileuploadID"/>
+                <t t-set="fileupload_action" t-translation="off">/web/binary/upload_attachment</t>
+                <t t-set="multi_upload" t-value="true"/>
+                <input type="hidden" name="model" t-att-value="widget.res_model"/>
+                <input type="hidden" name="id" t-att-value="widget.res_id"/>
+                <input type="hidden" name="session_id" t-att-value="widget.getSession().session_id"/>
+            </t>
+        </span>
+    </button>
+</t>
+
 </templates>
diff --git a/addons/web/static/tests/views/form_tests.js b/addons/web/static/tests/views/form_tests.js
index 6d8909ff2c3..37420e0f076 100644
--- a/addons/web/static/tests/views/form_tests.js
+++ b/addons/web/static/tests/views/form_tests.js
@@ -6227,6 +6227,28 @@ QUnit.module('Views', {
         delete widgetRegistry.map.test;
     });
 
+    QUnit.test('support header button as widgets on form statusbar', function (assert) {
+        assert.expect(2);
+
+        var form = createView({
+            View: FormView,
+            model: 'partner',
+            data: this.data,
+            arch: '<form string="Partners">' +
+                    '<header>' +
+                        '<widget name="attach_document" string="Attach document"/>' +
+                    '</header>' +
+                '</form>',
+        });
+
+        assert.strictEqual(form.$('button.o_attachment_button').length, 1,
+            "should have 1 attach_document widget in the statusbar");
+        assert.strictEqual(form.$('span.o_attach_document').text().trim(), 'Attach document',
+            "widget should have been instantiated");
+
+        form.destroy();
+    });
+
     QUnit.test('bounce edit button in readonly mode', function (assert) {
         assert.expect(3);
 
diff --git a/addons/web/views/webclient_templates.xml b/addons/web/views/webclient_templates.xml
index 2742871c790..35ded8170cf 100644
--- a/addons/web/views/webclient_templates.xml
+++ b/addons/web/views/webclient_templates.xml
@@ -240,6 +240,7 @@
         <script type="text/javascript" src="/web/static/src/js/views/calendar/calendar_quick_create.js"></script>
         <script type="text/javascript" src="/web/static/src/js/views/calendar/calendar_renderer.js"></script>
         <script type="text/javascript" src="/web/static/src/js/views/calendar/calendar_view.js"></script>
+        <script type="text/javascript" src="/web/static/src/js/widgets/attach_document.js"></script>
 
         <script type="text/javascript" src="/web/static/src/js/report/utils.js"/>
         <script type="text/javascript" src="/web/static/src/js/report/client_action.js"/>