diff --git a/addons/portal/static/src/signature_form/signature_form.js b/addons/portal/static/src/signature_form/signature_form.js
index 5da333a1387..5fdb283fd98 100644
--- a/addons/portal/static/src/signature_form/signature_form.js
+++ b/addons/portal/static/src/signature_form/signature_form.js
@@ -1,6 +1,7 @@
 /** @odoo-module **/
 
 import { Component, onMounted, useRef, useState } from "@odoo/owl";
+import dom from "@web/legacy/js/core/dom";
 import { _t } from "@web/core/l10n/translation";
 import { registry } from "@web/core/registry";
 import { redirect } from "@web/core/utils/urls";
@@ -62,10 +63,16 @@ class SignatureForm extends Component {
      * @returns {Promise}
      */
     async onClickSubmit() {
+        const button = document.querySelector('.o_portal_sign_submit')
+        const icon = button.removeChild(button.firstChild)
+        const restoreBtnLoading = dom.addButtonLoadingEffect(button);
+
         const name = this.signature.name;
         const signature = this.signature.getSignatureImage()[1];
         const data = await this.rpc(this.props.callUrl, { name, signature });
         if (data.force_refresh) {
+            restoreBtnLoading();
+            button.prepend(icon)
             if (data.redirect_url) {
                 redirect(data.redirect_url);
             } else {
diff --git a/addons/portal/static/src/signature_form/signature_form.xml b/addons/portal/static/src/signature_form/signature_form.xml
index d0af26a32d7..71b9631361d 100644
--- a/addons/portal/static/src/signature_form/signature_form.xml
+++ b/addons/portal/static/src/signature_form/signature_form.xml
@@ -22,7 +22,7 @@
                         </div>
                         <div class="text-end my-3">
                             <button type="submit" class="o_portal_sign_submit btn btn-primary" t-on-click.prevent="onClickSubmit" t-att-disabled="signature.isSignatureEmpty ? 'disabled' : ''">
-                                <i class="fa fa-check"/>
+                                <i class="fa fa-check me-1"/>
                                 <t t-esc="sendLabel"/>
                             </button>
                         </div>