diff --git a/app/javascript/sdk/IFrameHelper.js b/app/javascript/sdk/IFrameHelper.js
index 3ab1ba1f5..ffe2e75b4 100644
--- a/app/javascript/sdk/IFrameHelper.js
+++ b/app/javascript/sdk/IFrameHelper.js
@@ -19,6 +19,8 @@ import {
   setBubbleText,
   addUnreadClass,
   removeUnreadClass,
+  addArticleViewClass,
+  removeArticleViewClass,
 } from './bubbleHelpers';
 import { isWidgetColorLighter } from 'shared/helpers/colorHelper';
 import { dispatchWindowEvent } from 'shared/helpers/CustomEventHelper';
@@ -268,6 +270,10 @@ export const IFrameHelper = {
     },
 
     resetUnreadMode: () => removeUnreadClass(),
+
+    expandWidget: () => addArticleViewClass(),
+    collapseWidget: () => removeArticleViewClass(),
+
     handleNotificationDot: event => {
       if (window.$chatwoot.hideMessageBubble) {
         return;
diff --git a/app/javascript/sdk/bubbleHelpers.js b/app/javascript/sdk/bubbleHelpers.js
index c53323e27..e46dbee5a 100644
--- a/app/javascript/sdk/bubbleHelpers.js
+++ b/app/javascript/sdk/bubbleHelpers.js
@@ -110,3 +110,13 @@ export const removeUnreadClass = () => {
   const holderEl = document.querySelector('.woot-widget-holder');
   removeClasses(holderEl, 'has-unread-view');
 };
+
+export const addArticleViewClass = () => {
+  const holderEl = document.querySelector('.woot-widget-holder');
+  addClasses(holderEl, 'has-article-view');
+};
+
+export const removeArticleViewClass = () => {
+  const holderEl = document.querySelector('.woot-widget-holder');
+  removeClasses(holderEl, 'has-article-view');
+};
diff --git a/app/javascript/sdk/sdk.js b/app/javascript/sdk/sdk.js
index 095fe80ca..44473c8c8 100644
--- a/app/javascript/sdk/sdk.js
+++ b/app/javascript/sdk/sdk.js
@@ -7,11 +7,13 @@ export const SDK_CSS = `
 .woot-widget-holder {
   box-shadow: 0 5px 40px rgba(0, 0, 0, .16);
   opacity: 1;
-  will-change: transform, opacity;
+  will-change: transform, opacity, width, height;
   transform: translateY(0);
   overflow: hidden !important;
   position: fixed !important;
-  transition: opacity 0.2s linear, transform 0.25s linear;
+  transition: opacity 0.2s linear, transform 0.25s linear,
+    width 0.3s cubic-bezier(0.4, 0, 0.2, 1),
+    height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
   z-index: 2147483000 !important;
 }
 
@@ -287,6 +289,12 @@ export const SDK_CSS = `
     min-height: 250px !important;
     width: 400px !important;
  }
+
+  .woot-widget-holder.has-article-view {
+    width: min(640px, max(0px, -20px + 100dvw)) !important;
+    height: calc(100% - 125px) !important;
+    max-height: none !important;
+  }
 }
 
 .woot-hidden {
diff --git a/app/javascript/widget/App.vue b/app/javascript/widget/App.vue
index 0d456fa83..c5ed2f9cc 100755
--- a/app/javascript/widget/App.vue
+++ b/app/javascript/widget/App.vue
@@ -81,6 +81,15 @@ export default {
         document.documentElement.dir = value ? 'rtl' : 'ltr';
       },
     },
+    '$route.name'(routeName, previousRouteName) {
+      // Expansion is driven by the rendered portal page (see the
+      // 'portalPageLoaded' handler) so the widget only widens for article pages.
+      // Here we just collapse when leaving the article view, since the iframe is
+      // torn down then and can no longer signal.
+      if (this.isIFrame && previousRouteName === 'article-viewer') {
+        IFrameHelper.sendMessage({ event: 'collapseWidget' });
+      }
+    },
   },
   mounted() {
     const { websiteToken, locale, widgetColor } = window.chatwootWebChannel;
@@ -342,6 +351,10 @@ export default {
           this.setColorScheme(message.darkMode);
         } else if (message.event === 'open-article') {
           this.openArticle(message.slug);
+        } else if (message.event === 'portalPageLoaded') {
+          IFrameHelper.sendMessage({
+            event: message.isArticle ? 'expandWidget' : 'collapseWidget',
+          });
         } else if (message.event === 'toggle-open') {
           this.$store.dispatch('appConfig/toggleWidgetOpen', message.isOpen);
 
diff --git a/app/views/layouts/_portal_scripts.html.erb b/app/views/layouts/_portal_scripts.html.erb
index b1479cace..ef04f5ec7 100644
--- a/app/views/layouts/_portal_scripts.html.erb
+++ b/app/views/layouts/_portal_scripts.html.erb
@@ -88,6 +88,19 @@ html.light {
     tocHeader: '<%= I18n.t('public_portal.toc_header') %>'
   };
 </script>
+<% if @is_plain_layout_enabled %>
+<script>
+  // When rendered inside the chat widget, tell it whether this is an article
+  // page so the widget widens only for articles and collapses on every other page.
+  window.parent.postMessage(
+    'chatwoot-widget:' + JSON.stringify({
+      event: 'portalPageLoaded',
+      isArticle: <%= @article.present? %>,
+    }),
+    '*'
+  );
+</script>
+<% end %>
 <% if @portal.channel_web_widget.present? && !@is_plain_layout_enabled %>
 <script>
   window.chatwootSettings = window.chatwootSettings || {};