diff --git a/PdfForQtLib/PdfForQtLib.pro b/PdfForQtLib/PdfForQtLib.pro
index 342c656..3ad96bb 100644
--- a/PdfForQtLib/PdfForQtLib.pro
+++ b/PdfForQtLib/PdfForQtLib.pro
@@ -51,7 +51,8 @@ SOURCES += \
     sources/pdfcolorspaces.cpp \
     sources/pdfrenderer.cpp \
     sources/pdfpagecontentprocessor.cpp \
-    sources/pdfpainter.cpp
+    sources/pdfpainter.cpp \
+    sources/pdfrenderingerrorswidget.cpp
 
 HEADERS += \
     sources/pdfobject.h \
@@ -75,7 +76,8 @@ HEADERS += \
     sources/pdfrenderer.h \
     sources/pdfpagecontentprocessor.h \
     sources/pdfpainter.h \
-    sources/pdfutils.h
+    sources/pdfutils.h \
+    sources/pdfrenderingerrorswidget.h
 
 unix {
     target.path = /usr/lib
@@ -87,3 +89,6 @@ CONFIG += force_debug_info
 
 
 QMAKE_CXXFLAGS += /std:c++latest /utf-8
+
+FORMS += \
+    sources/pdfrenderingerrorswidget.ui
diff --git a/PdfForQtLib/sources/pdfdrawspacecontroller.cpp b/PdfForQtLib/sources/pdfdrawspacecontroller.cpp
index eac9b43..cc08181 100644
--- a/PdfForQtLib/sources/pdfdrawspacecontroller.cpp
+++ b/PdfForQtLib/sources/pdfdrawspacecontroller.cpp
@@ -535,10 +535,38 @@ void PDFDrawWidgetProxy::draw(QPainter* painter, QRect rect)
 
             PDFRenderer renderer(m_controller->getDocument());
             QList<PDFRenderError> errors = renderer.render(painter, placedRect, item.pageIndex);
+
+            if (!errors.empty())
+            {
+                emit renderingError(item.pageIndex, errors);
+            }
         }
     }
 }
 
+std::vector<PDFInteger> PDFDrawWidgetProxy::getPagesIntersectingRect(QRect rect) const
+{
+    std::vector<PDFInteger> pages;
+
+    // We assume, that no more, than 32 pages will be displayed in the rectangle
+    pages.reserve(32);
+
+    // Iterate trough pages, place them and test, if they intersects with rectangle
+    for (const LayoutItem& item : m_layout.items)
+    {
+        // The offsets m_horizontalOffset and m_verticalOffset are offsets to the
+        // topleft point of the block. But block maybe doesn't start at (0, 0),
+        // so we must also use translation from the block beginning.
+        QRect placedRect = item.pageRect.translated(m_horizontalOffset - m_layout.blockRect.left(), m_verticalOffset - m_layout.blockRect.top());
+        if (placedRect.intersects(rect))
+        {
+            pages.push_back(item.pageIndex);
+        }
+    }
+
+    return pages;
+}
+
 void PDFDrawWidgetProxy::performOperation(Operation operation)
 {
     switch (operation)
diff --git a/PdfForQtLib/sources/pdfdrawspacecontroller.h b/PdfForQtLib/sources/pdfdrawspacecontroller.h
index f2be291..f122492 100644
--- a/PdfForQtLib/sources/pdfdrawspacecontroller.h
+++ b/PdfForQtLib/sources/pdfdrawspacecontroller.h
@@ -20,6 +20,7 @@
 
 #include "pdfglobal.h"
 #include "pdfdocument.h"
+#include "pdfrenderer.h"
 
 #include <QRectF>
 #include <QObject>
@@ -177,11 +178,16 @@ public:
     /// Returns the page layout
     PageLayout getPageLayout() const { return m_controller->getPageLayout(); }
 
+    /// Returns pages, which are intersecting rectangle (even partially)
+    /// \param rect Rectangle to test
+    std::vector<PDFInteger> getPagesIntersectingRect(QRect rect) const;
+
     static constexpr PDFReal ZOOM_STEP = 1.2;
 
 signals:
     void drawSpaceChanged();
     void pageLayoutChanged();
+    void renderingError(PDFInteger pageIndex, const QList<PDFRenderError>& errors);
 
 private:
     struct LayoutItem
diff --git a/PdfForQtLib/sources/pdfdrawwidget.cpp b/PdfForQtLib/sources/pdfdrawwidget.cpp
index 3a48ccd..8f05abc 100644
--- a/PdfForQtLib/sources/pdfdrawwidget.cpp
+++ b/PdfForQtLib/sources/pdfdrawwidget.cpp
@@ -49,6 +49,7 @@ PDFWidget::PDFWidget(QWidget* parent) :
 
     m_proxy = new PDFDrawWidgetProxy(this);
     m_proxy->init(this);
+    connect(m_proxy, &PDFDrawWidgetProxy::renderingError, this, &PDFWidget::onRenderingError);
 }
 
 PDFWidget::~PDFWidget()
@@ -61,6 +62,24 @@ void PDFWidget::setDocument(const PDFDocument* document)
     m_proxy->setDocument(document);
 }
 
+int PDFWidget::getPageRenderingErrorCount() const
+{
+    int count = 0;
+    for (const auto& item : m_pageRenderingErrors)
+    {
+        count += item.second.size();
+    }
+    return count;
+}
+
+void PDFWidget::onRenderingError(PDFInteger pageIndex, const QList<PDFRenderError>& errors)
+{
+    // Empty list of error should not be reported!
+    Q_ASSERT(!errors.empty());
+    m_pageRenderingErrors[pageIndex] = errors;
+    emit pageRenderingErrorsChanged(pageIndex, errors.size());
+}
+
 PDFDrawWidget::PDFDrawWidget(PDFWidget* widget, QWidget* parent) :
     QWidget(parent),
     m_widget(widget),
@@ -74,6 +93,11 @@ PDFDrawWidget::~PDFDrawWidget()
 
 }
 
+std::vector<PDFInteger> PDFDrawWidget::getCurrentPages() const
+{
+    return m_widget->getDrawWidgetProxy()->getPagesIntersectingRect(this->rect());
+}
+
 QSize PDFDrawWidget::minimumSizeHint() const
 {
     return QSize(200, 200);
diff --git a/PdfForQtLib/sources/pdfdrawwidget.h b/PdfForQtLib/sources/pdfdrawwidget.h
index 25448c4..befcacd 100644
--- a/PdfForQtLib/sources/pdfdrawwidget.h
+++ b/PdfForQtLib/sources/pdfdrawwidget.h
@@ -20,6 +20,7 @@
 #define PDFDRAWWIDGET_H
 
 #include "pdfglobal.h"
+#include "pdfrenderer.h"
 
 #include <QWidget>
 #include <QScrollBar>
@@ -38,6 +39,8 @@ public:
     explicit PDFWidget(QWidget* parent);
     virtual ~PDFWidget() override;
 
+    using PageRenderingErrors = std::map<PDFInteger, QList<PDFRenderError>>;
+
     /// Sets the document to be viewed in this widget. Document can be nullptr,
     /// in that case, widget contents are cleared.
     /// \param document Document
@@ -47,12 +50,20 @@ public:
     QScrollBar* getHorizontalScrollbar() const { return m_horizontalScrollBar; }
     QScrollBar* getVerticalScrollbar() const { return m_verticalScrollBar; }
     PDFDrawWidgetProxy* getDrawWidgetProxy() const { return m_proxy; }
+    const PageRenderingErrors* getPageRenderingErrors() const { return &m_pageRenderingErrors; }
+    int getPageRenderingErrorCount() const;
+
+signals:
+    void pageRenderingErrorsChanged(PDFInteger pageIndex, int errorsCount);
 
 private:
+    void onRenderingError(PDFInteger pageIndex, const QList<PDFRenderError>& errors);
+
     PDFDrawWidget* m_drawWidget;
     QScrollBar* m_horizontalScrollBar;
     QScrollBar* m_verticalScrollBar;
     PDFDrawWidgetProxy* m_proxy;
+    PageRenderingErrors m_pageRenderingErrors;
 };
 
 class PDFFORQTLIBSHARED_EXPORT PDFDrawWidget : public QWidget
@@ -63,6 +74,9 @@ public:
     explicit PDFDrawWidget(PDFWidget* widget, QWidget* parent);
     virtual ~PDFDrawWidget() override;
 
+    /// Returns page indices, which are currently displayed in the widget
+    std::vector<PDFInteger> getCurrentPages() const;
+
     virtual QSize minimumSizeHint() const override;
 
 protected:
diff --git a/PdfForQtLib/sources/pdfrenderingerrorswidget.cpp b/PdfForQtLib/sources/pdfrenderingerrorswidget.cpp
new file mode 100644
index 0000000..7f57f77
--- /dev/null
+++ b/PdfForQtLib/sources/pdfrenderingerrorswidget.cpp
@@ -0,0 +1,95 @@
+//    Copyright (C) 2019 Jakub Melka
+//
+//    This file is part of PdfForQt.
+//
+//    PdfForQt is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    PdfForQt is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with PDFForQt.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "pdfrenderingerrorswidget.h"
+#include "pdfdrawwidget.h"
+#include "ui_pdfrenderingerrorswidget.h"
+
+namespace pdf
+{
+
+PDFRenderingErrorsWidget::PDFRenderingErrorsWidget(QWidget* parent, PDFWidget* pdfWidget) :
+    QDialog(parent),
+    ui(new Ui::PDFRenderingErrorsWidget)
+{
+    ui->setupUi(this);
+
+    ui->renderErrorsTreeWidget->setColumnCount(3);
+    ui->renderErrorsTreeWidget->setColumnWidth(0, 100);
+    ui->renderErrorsTreeWidget->setColumnWidth(1, 300);
+    ui->renderErrorsTreeWidget->setHeaderLabels({ tr("Page"), tr("Error type"), tr("Description") });
+
+    Q_ASSERT(pdfWidget);
+    std::vector<PDFInteger> currentPages = pdfWidget->getDrawWidget()->getCurrentPages();
+    qSort(currentPages);
+
+    QTreeWidgetItem* scrollToItem = nullptr;
+    const PDFWidget::PageRenderingErrors* pageRenderingErrors = pdfWidget->getPageRenderingErrors();
+    for (const auto& pageRenderingError : *pageRenderingErrors)
+    {
+        // TODO: udelat realna cisla stranek
+        const PDFInteger pageIndex = pageRenderingError.first;
+        QTreeWidgetItem* root = new QTreeWidgetItem(ui->renderErrorsTreeWidget, QStringList() << QString::number(pageIndex + 1) << QString() << QString());
+
+        for (const PDFRenderError& error : pageRenderingError.second)
+        {
+            QString typeString;
+            switch (error.type)
+            {
+                case RenderErrorType::Error:
+                {
+                    typeString = tr("Error");
+                    break;
+                }
+
+                case RenderErrorType::NotImplemented:
+                {
+                    typeString = tr("Not implemented");
+                    break;
+                }
+
+                default:
+                {
+                    Q_ASSERT(false);
+                    break;
+                }
+            }
+
+            new QTreeWidgetItem(root, QStringList() << QString() << typeString << error.message);
+        }
+
+        bool isCurrentPage = std::binary_search(currentPages.cbegin(), currentPages.cend(), pageIndex);
+        ui->renderErrorsTreeWidget->setItemExpanded(root, isCurrentPage);
+
+        if (isCurrentPage && !scrollToItem)
+        {
+            scrollToItem = root;
+        }
+    }
+
+    if (scrollToItem)
+    {
+        ui->renderErrorsTreeWidget->scrollToItem(scrollToItem, QAbstractItemView::EnsureVisible);
+    }
+}
+
+PDFRenderingErrorsWidget::~PDFRenderingErrorsWidget()
+{
+    delete ui;
+}
+
+}   // namespace pdf
diff --git a/PdfForQtLib/sources/pdfrenderingerrorswidget.h b/PdfForQtLib/sources/pdfrenderingerrorswidget.h
new file mode 100644
index 0000000..f7d1657
--- /dev/null
+++ b/PdfForQtLib/sources/pdfrenderingerrorswidget.h
@@ -0,0 +1,48 @@
+//    Copyright (C) 2019 Jakub Melka
+//
+//    This file is part of PdfForQt.
+//
+//    PdfForQt is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    PdfForQt is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with PDFForQt.  If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef PDFRENDERINGERRORSWIDGET_H
+#define PDFRENDERINGERRORSWIDGET_H
+
+#include "pdfglobal.h"
+
+#include <QDialog>
+
+namespace Ui
+{
+class PDFRenderingErrorsWidget;
+}
+
+namespace pdf
+{
+class PDFWidget;
+
+class PDFFORQTLIBSHARED_EXPORT PDFRenderingErrorsWidget : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit PDFRenderingErrorsWidget(QWidget* parent, PDFWidget* pdfWidget);
+    virtual ~PDFRenderingErrorsWidget() override;
+
+private:
+    Ui::PDFRenderingErrorsWidget* ui;
+};
+
+}   // namespace pdf
+
+#endif // PDFRENDERINGERRORSWIDGET_H
diff --git a/PdfForQtLib/sources/pdfrenderingerrorswidget.ui b/PdfForQtLib/sources/pdfrenderingerrorswidget.ui
new file mode 100644
index 0000000..954bd99
--- /dev/null
+++ b/PdfForQtLib/sources/pdfrenderingerrorswidget.ui
@@ -0,0 +1,73 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>PDFRenderingErrorsWidget</class>
+ <widget class="QDialog" name="PDFRenderingErrorsWidget">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>798</width>
+    <height>510</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Rendering errors</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <item>
+    <widget class="QTreeWidget" name="renderErrorsTreeWidget">
+     <column>
+      <property name="text">
+       <string notr="true">1</string>
+      </property>
+     </column>
+    </widget>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>PDFRenderingErrorsWidget</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>248</x>
+     <y>254</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>PDFRenderingErrorsWidget</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>316</x>
+     <y>260</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>
diff --git a/PdfForQtViewer/pdfviewermainwindow.cpp b/PdfForQtViewer/pdfviewermainwindow.cpp
index 7035084..bad78ea 100644
--- a/PdfForQtViewer/pdfviewermainwindow.cpp
+++ b/PdfForQtViewer/pdfviewermainwindow.cpp
@@ -23,6 +23,7 @@
 #include "pdfstreamfilters.h"
 #include "pdfdrawwidget.h"
 #include "pdfdrawspacecontroller.h"
+#include "pdfrenderingerrorswidget.h"
 
 #include <QSettings>
 #include <QFileDialog>
@@ -76,6 +77,7 @@ PDFViewerMainWindow::PDFViewerMainWindow(QWidget *parent) :
     setFocusProxy(m_pdfWidget);
 
     connect(m_pdfWidget->getDrawWidgetProxy(), &pdf::PDFDrawWidgetProxy::pageLayoutChanged, this, &PDFViewerMainWindow::updatePageLayoutActions);
+    connect(m_pdfWidget, &pdf::PDFWidget::pageRenderingErrorsChanged, this, &PDFViewerMainWindow::onPageRenderingErrorsChanged, Qt::QueuedConnection);
 
     readSettings();
     updatePageLayoutActions();
@@ -105,6 +107,14 @@ void PDFViewerMainWindow::onActionQuitTriggered()
     close();
 }
 
+void PDFViewerMainWindow::onPageRenderingErrorsChanged(pdf::PDFInteger pageIndex, int errorsCount)
+{
+    if (errorsCount > 0)
+    {
+        statusBar()->showMessage(tr("Rendering of page %1: %2 errors occured.").arg(pageIndex + 1).arg(errorsCount), 4000);
+    }
+}
+
 void PDFViewerMainWindow::readSettings()
 {
     QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName());
@@ -287,4 +297,10 @@ void PDFViewerMainWindow::on_actionFirstPageOnRightSide_triggered()
     }
 }
 
+void PDFViewerMainWindow::on_actionRendering_Errors_triggered()
+{
+    pdf::PDFRenderingErrorsWidget renderingErrorsDialog(this, m_pdfWidget);
+    renderingErrorsDialog.exec();
+}
+
 }   // namespace pdfviewer
diff --git a/PdfForQtViewer/pdfviewermainwindow.h b/PdfForQtViewer/pdfviewermainwindow.h
index 2df12ed..64df6a4 100644
--- a/PdfForQtViewer/pdfviewermainwindow.h
+++ b/PdfForQtViewer/pdfviewermainwindow.h
@@ -19,6 +19,7 @@
 #define PDFVIEWERMAINWINDOW_H
 
 #include "pdfcatalog.h"
+#include "pdfrenderer.h"
 
 #include <QMainWindow>
 #include <QSharedPointer>
@@ -54,10 +55,13 @@ private slots:
     void on_actionPageLayoutTwoColumns_triggered();
     void on_actionFirstPageOnRightSide_triggered();
 
+    void on_actionRendering_Errors_triggered();
+
 private:
     void onActionOpenTriggered();
     void onActionCloseTriggered();
     void onActionQuitTriggered();
+    void onPageRenderingErrorsChanged(pdf::PDFInteger pageIndex, int errorsCount);
 
     void readSettings();
     void writeSettings();
diff --git a/PdfForQtViewer/pdfviewermainwindow.ui b/PdfForQtViewer/pdfviewermainwindow.ui
index 077d888..cfd62a3 100644
--- a/PdfForQtViewer/pdfviewermainwindow.ui
+++ b/PdfForQtViewer/pdfviewermainwindow.ui
@@ -53,9 +53,16 @@
     </widget>
     <addaction name="menuPage_Layout"/>
    </widget>
+   <widget class="QMenu" name="menuTools">
+    <property name="title">
+     <string>Tools</string>
+    </property>
+    <addaction name="actionRendering_Errors"/>
+   </widget>
    <addaction name="menuFile"/>
    <addaction name="menuView"/>
    <addaction name="menuGoTo"/>
+   <addaction name="menuTools"/>
   </widget>
   <widget class="QToolBar" name="mainToolBar">
    <attribute name="toolBarArea">
@@ -139,6 +146,14 @@
     <string>Ctrl+5</string>
    </property>
   </action>
+  <action name="actionRendering_Errors">
+   <property name="text">
+    <string>Rendering Errors</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+E</string>
+   </property>
+  </action>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
  <resources/>