diff --git a/src/plugins/help/helpconstants.h b/src/plugins/help/helpconstants.h
index a212159ceb3..294424af7dc 100644
--- a/src/plugins/help/helpconstants.h
+++ b/src/plugins/help/helpconstants.h
@@ -49,6 +49,7 @@ const char HELP_HOME[] = "Help.Home";
 const char HELP_PREVIOUS[] = "Help.Previous";
 const char HELP_NEXT[] = "Help.Next";
 const char HELP_ADDBOOKMARK[] = "Help.AddBookmark";
+const char HELP_OPENONLINE[] = "Help.OpenOnline";
 const char HELP_INDEX[] = "Help.Index";
 const char HELP_CONTENTS[] = "Help.Contents";
 const char HELP_SEARCH[] = "Help.Search";
diff --git a/src/plugins/help/helpplugin.cpp b/src/plugins/help/helpplugin.cpp
index 7e8bf80c81d..c06619f3bc9 100644
--- a/src/plugins/help/helpplugin.cpp
+++ b/src/plugins/help/helpplugin.cpp
@@ -701,19 +701,8 @@ HelpViewer *HelpPluginPrivate::showHelpUrl(const QUrl &url, Core::HelpManager::H
         return nullptr;
 
     if (!HelpManager::findFile(url).isValid()) {
-        const QString address = url.toString();
-        if (address.startsWith("qthelp://org.qt-project.")
-                || address.startsWith("qthelp://com.nokia.")
-                || address.startsWith("qthelp://com.trolltech.")) {
-            // local help not installed, resort to external web help
-            QString urlPrefix = "http://doc.qt.io/";
-            if (url.authority().startsWith(qtcreatorUnversionedID))
-                urlPrefix.append(QString::fromLatin1("qtcreator"));
-            else
-                urlPrefix.append("qt-5");
-            QDesktopServices::openUrl(QUrl(urlPrefix + address.mid(address.lastIndexOf(QLatin1Char('/')))));
+        if (LocalHelpManager::openOnlineHelp(url))
             return nullptr;
-        }
     }
 
     HelpViewer *viewer = viewerForHelpViewerLocation(location);
diff --git a/src/plugins/help/helpwidget.cpp b/src/plugins/help/helpwidget.cpp
index 64f76e4e6cb..74557c3c712 100644
--- a/src/plugins/help/helpwidget.cpp
+++ b/src/plugins/help/helpwidget.cpp
@@ -208,6 +208,11 @@ HelpWidget::HelpWidget(const Core::Context &context, WidgetStyle style, QWidget
     layout->addWidget(new Utils::StyledSeparator(toolBar));
     layout->addWidget(Core::Command::toolButtonWithAppendedShortcut(m_addBookmarkAction, cmd));
 
+    m_openOnlineDocumentationAction = new QAction(Utils::Icons::EXPORTFILE_TOOLBAR.icon(), tr("Open Online Documentation..."), this);
+    cmd = Core::ActionManager::registerAction(m_openOnlineDocumentationAction, Constants::HELP_OPENONLINE, context);
+    connect(m_openOnlineDocumentationAction, &QAction::triggered, this, &HelpWidget::openOnlineDocumentation);
+    layout->addWidget(Core::Command::toolButtonWithAppendedShortcut(m_openOnlineDocumentationAction, cmd));
+
     if (style == ModeWidget) {
         layout->addWidget(new Utils::StyledSeparator(toolBar));
         layout->addWidget(OpenPagesManager::instance().openPagesComboBox(), 10);
@@ -453,6 +458,7 @@ void HelpWidget::setCurrentViewer(HelpViewer *viewer)
     m_backAction->setEnabled(viewer->isBackwardAvailable());
     m_forwardAction->setEnabled(viewer->isForwardAvailable());
     m_addBookmarkAction->setEnabled(isBookmarkable(viewer->source()));
+    m_openOnlineDocumentationAction->setEnabled(LocalHelpManager::canOpenOnlineHelp(viewer->source()));
     if (m_style == ExternalWindow)
         updateWindowTitle();
     emit sourceChanged(viewer->source());
@@ -472,6 +478,7 @@ void HelpWidget::addViewer(HelpViewer *viewer)
     connect(viewer, &HelpViewer::sourceChanged, this, [viewer, this](const QUrl &url) {
         if (currentViewer() == viewer) {
             m_addBookmarkAction->setEnabled(isBookmarkable(url));
+            m_openOnlineDocumentationAction->setEnabled(LocalHelpManager::canOpenOnlineHelp(url));
             emit sourceChanged(url);
         }
     });
@@ -633,6 +640,13 @@ void HelpWidget::addBookmark()
     manager->showBookmarkDialog(this, viewer->title(), url);
 }
 
+void HelpWidget::openOnlineDocumentation()
+{
+    HelpViewer *viewer = currentViewer();
+    QTC_ASSERT(viewer, return);
+    LocalHelpManager::openOnlineHelp(viewer->source());
+}
+
 void HelpWidget::copy()
 {
     QTC_ASSERT(currentViewer(), return);
diff --git a/src/plugins/help/helpwidget.h b/src/plugins/help/helpwidget.h
index fb084c99f3e..bc38dcaa070 100644
--- a/src/plugins/help/helpwidget.h
+++ b/src/plugins/help/helpwidget.h
@@ -99,6 +99,7 @@ private:
 
     void goHome();
     void addBookmark();
+    void openOnlineDocumentation();
     void copy();
     void forward();
     void backward();
@@ -120,6 +121,7 @@ private:
     QAction *m_backAction = nullptr;
     QAction *m_forwardAction = nullptr;
     QAction *m_addBookmarkAction = nullptr;
+    QAction *m_openOnlineDocumentationAction = nullptr;
     QComboBox *m_filterComboBox = nullptr;
     QAction *m_closeAction = nullptr;
     QAction *m_scaleUp = nullptr;
diff --git a/src/plugins/help/localhelpmanager.cpp b/src/plugins/help/localhelpmanager.cpp
index 140aa4a9350..828af819844 100644
--- a/src/plugins/help/localhelpmanager.cpp
+++ b/src/plugins/help/localhelpmanager.cpp
@@ -36,6 +36,7 @@
 #include <utils/hostosinfo.h>
 #include <utils/qtcassert.h>
 
+#include <QDesktopServices>
 #include <QFontDatabase>
 #include <QMutexLocker>
 
@@ -445,3 +446,31 @@ void LocalHelpManager::updateFilterModel()
     }
     emit m_instance->filterIndexChanged(m_currentFilterIndex);
 }
+
+bool LocalHelpManager::canOpenOnlineHelp(const QUrl &url)
+{
+    const QString address = url.toString();
+    if (address.startsWith("qthelp://org.qt-project.")
+            || address.startsWith("qthelp://com.nokia.")
+            || address.startsWith("qthelp://com.trolltech.")) {
+        return true;
+    }
+    return false;
+}
+
+bool LocalHelpManager::openOnlineHelp(const QUrl &url)
+{
+    static const QString qtcreatorUnversionedID = "org.qt-project.qtcreator";
+
+    if (canOpenOnlineHelp(url)) {
+        QString urlPrefix = "http://doc.qt.io/";
+        if (url.authority().startsWith(qtcreatorUnversionedID))
+            urlPrefix.append(QString::fromLatin1("qtcreator"));
+        else
+            urlPrefix.append("qt-5");
+        const QString address = url.toString();
+        QDesktopServices::openUrl(QUrl(urlPrefix + address.mid(address.lastIndexOf(QLatin1Char('/')))));
+        return true;
+    }
+    return false;
+}
diff --git a/src/plugins/help/localhelpmanager.h b/src/plugins/help/localhelpmanager.h
index 7b330ade309..8e4e8ce0036 100644
--- a/src/plugins/help/localhelpmanager.h
+++ b/src/plugins/help/localhelpmanager.h
@@ -105,6 +105,9 @@ public:
 
     static void updateFilterModel();
 
+    static bool canOpenOnlineHelp(const QUrl &url);
+    static bool openOnlineHelp(const QUrl &url);
+
 signals:
     void filterIndexChanged(int index);
     void fallbackFontChanged(const QFont &font);