diff --git a/src/base/bittorrent/session.cpp b/src/base/bittorrent/session.cpp
index b8189d126..7d2a7f58c 100644
--- a/src/base/bittorrent/session.cpp
+++ b/src/base/bittorrent/session.cpp
@@ -1005,7 +1005,7 @@ void Session::freeInstance()
 {
     if (m_instance) {
         delete m_instance;
-        m_instance = 0;
+        m_instance = nullptr;
     }
 }
 
diff --git a/src/base/bittorrent/session.h b/src/base/bittorrent/session.h
index 9b23f09cf..9cd2e2380 100644
--- a/src/base/bittorrent/session.h
+++ b/src/base/bittorrent/session.h
@@ -562,7 +562,7 @@ namespace BitTorrent
             bool requestedFileDeletion;
         };
 
-        explicit Session(QObject *parent = 0);
+        explicit Session(QObject *parent = nullptr);
         ~Session();
 
         bool hasPerTorrentRatioLimit() const;
diff --git a/src/base/bittorrent/torrenthandle.cpp b/src/base/bittorrent/torrenthandle.cpp
index 4f49f5c88..37f8fd711 100644
--- a/src/base/bittorrent/torrenthandle.cpp
+++ b/src/base/bittorrent/torrenthandle.cpp
@@ -1641,7 +1641,7 @@ void TorrentHandle::handleSaveResumeDataFailedAlert(libtorrent::save_resume_data
     // if torrent has no metadata we should save dummy fastresume data
     // containing Magnet URI and qBittorrent own resume data only
     if (p->error.value() == libt::errors::no_metadata)
-        handleSaveResumeDataAlert(0);
+        handleSaveResumeDataAlert(nullptr);
     else
         m_session->handleTorrentResumeDataFailed(this);
 }
diff --git a/src/base/http/connection.h b/src/base/http/connection.h
index 7ca3ca845..1eb8297aa 100644
--- a/src/base/http/connection.h
+++ b/src/base/http/connection.h
@@ -50,7 +50,7 @@ namespace Http
         Q_DISABLE_COPY(Connection)
 
     public:
-        Connection(QTcpSocket *socket, IRequestHandler *requestHandler, QObject *parent = 0);
+        Connection(QTcpSocket *socket, IRequestHandler *requestHandler, QObject *parent = nullptr);
         ~Connection();
 
         bool hasExpired(qint64 timeout) const;
diff --git a/src/base/iconprovider.cpp b/src/base/iconprovider.cpp
index 8d137556d..316ec67cf 100644
--- a/src/base/iconprovider.cpp
+++ b/src/base/iconprovider.cpp
@@ -47,7 +47,7 @@ void IconProvider::freeInstance()
 {
     if (m_instance) {
         delete m_instance;
-        m_instance = 0;
+        m_instance = nullptr;
     }
 }
 
@@ -61,4 +61,4 @@ QString IconProvider::getIconPath(const QString &iconId)
     return ":/icons/qbt-theme/" + iconId + ".png";
 }
 
-IconProvider *IconProvider::m_instance = 0;
+IconProvider *IconProvider::m_instance = nullptr;
diff --git a/src/base/iconprovider.h b/src/base/iconprovider.h
index f9c00d63c..98e204bd9 100644
--- a/src/base/iconprovider.h
+++ b/src/base/iconprovider.h
@@ -46,7 +46,7 @@ public:
     virtual QString getIconPath(const QString &iconId);
 
 protected:
-    explicit IconProvider(QObject *parent = 0);
+    explicit IconProvider(QObject *parent = nullptr);
     ~IconProvider();
 
     static IconProvider *m_instance;
diff --git a/src/base/logger.cpp b/src/base/logger.cpp
index 53855fb10..faa7aeb53 100644
--- a/src/base/logger.cpp
+++ b/src/base/logger.cpp
@@ -3,7 +3,7 @@
 #include <QDateTime>
 #include "base/utils/string.h"
 
-Logger* Logger::m_instance = 0;
+Logger* Logger::m_instance = nullptr;
 
 Logger::Logger()
     : lock(QReadWriteLock::Recursive)
@@ -29,7 +29,7 @@ void Logger::freeInstance()
 {
     if (m_instance) {
         delete m_instance;
-        m_instance = 0;
+        m_instance = nullptr;
     }
 }
 
diff --git a/src/base/net/downloadmanager.cpp b/src/base/net/downloadmanager.cpp
index 7abc7ebcc..50c31639e 100644
--- a/src/base/net/downloadmanager.cpp
+++ b/src/base/net/downloadmanager.cpp
@@ -51,7 +51,7 @@ namespace
     class NetworkCookieJar: public QNetworkCookieJar
     {
     public:
-        explicit NetworkCookieJar(QObject *parent = 0)
+        explicit NetworkCookieJar(QObject *parent = nullptr)
             : QNetworkCookieJar(parent)
         {
             QDateTime now = QDateTime::currentDateTime();
@@ -107,7 +107,7 @@ namespace
 
 using namespace Net;
 
-DownloadManager *DownloadManager::m_instance = 0;
+DownloadManager *DownloadManager::m_instance = nullptr;
 
 DownloadManager::DownloadManager(QObject *parent)
     : QObject(parent)
@@ -128,7 +128,7 @@ void DownloadManager::freeInstance()
 {
     if (m_instance) {
         delete m_instance;
-        m_instance = 0;
+        m_instance = nullptr;
     }
 }
 
diff --git a/src/base/net/downloadmanager.h b/src/base/net/downloadmanager.h
index 35acc4777..e847dbd01 100644
--- a/src/base/net/downloadmanager.h
+++ b/src/base/net/downloadmanager.h
@@ -64,7 +64,7 @@ namespace Net
     #endif
 
     private:
-        explicit DownloadManager(QObject *parent = 0);
+        explicit DownloadManager(QObject *parent = nullptr);
 
         void applyProxySettings();
 
diff --git a/src/base/net/private/geoipdatabase.cpp b/src/base/net/private/geoipdatabase.cpp
index 9594ac929..1a29fab71 100644
--- a/src/base/net/private/geoipdatabase.cpp
+++ b/src/base/net/private/geoipdatabase.cpp
@@ -91,7 +91,7 @@ GeoIPDatabase::GeoIPDatabase(quint32 size)
 
 GeoIPDatabase *GeoIPDatabase::load(const QString &filename, QString &error)
 {
-    GeoIPDatabase *db = 0;
+    GeoIPDatabase *db = nullptr;
     QFile file(filename);
     if (file.size() > MAX_FILE_SIZE) {
         error = tr("Unsupported database file size.");
@@ -122,7 +122,7 @@ GeoIPDatabase *GeoIPDatabase::load(const QString &filename, QString &error)
 
 GeoIPDatabase *GeoIPDatabase::load(const QByteArray &data, QString &error)
 {
-    GeoIPDatabase *db = 0;
+    GeoIPDatabase *db = nullptr;
     if (data.size() > MAX_FILE_SIZE) {
         error = tr("Unsupported database file size.");
         return 0;
diff --git a/src/base/net/proxyconfigurationmanager.cpp b/src/base/net/proxyconfigurationmanager.cpp
index 234881fd3..e792df651 100644
--- a/src/base/net/proxyconfigurationmanager.cpp
+++ b/src/base/net/proxyconfigurationmanager.cpp
@@ -80,7 +80,7 @@ void ProxyConfigurationManager::freeInstance()
 {
     if (m_instance) {
         delete m_instance;
-        m_instance = 0;
+        m_instance = nullptr;
     }
 }
 
diff --git a/src/base/net/reverseresolution.h b/src/base/net/reverseresolution.h
index ef181762a..c0a39dede 100644
--- a/src/base/net/reverseresolution.h
+++ b/src/base/net/reverseresolution.h
@@ -47,7 +47,7 @@ namespace Net
         Q_DISABLE_COPY(ReverseResolution)
 
     public:
-        explicit ReverseResolution(QObject *parent = 0);
+        explicit ReverseResolution(QObject *parent = nullptr);
         ~ReverseResolution();
 
         void resolve(const QString &ip);
diff --git a/src/base/preferences.cpp b/src/base/preferences.cpp
index 03b12e6bb..efb0e75d8 100644
--- a/src/base/preferences.cpp
+++ b/src/base/preferences.cpp
@@ -59,7 +59,7 @@
 #include "utils/fs.h"
 #include "utils/misc.h"
 
-Preferences *Preferences::m_instance = 0;
+Preferences *Preferences::m_instance = nullptr;
 
 Preferences::Preferences() = default;
 
@@ -78,7 +78,7 @@ void Preferences::freeInstance()
 {
     if (m_instance) {
         delete m_instance;
-        m_instance = 0;
+        m_instance = nullptr;
     }
 }
 
diff --git a/src/base/scanfoldersmodel.cpp b/src/base/scanfoldersmodel.cpp
index c35918797..2d327f8bb 100644
--- a/src/base/scanfoldersmodel.cpp
+++ b/src/base/scanfoldersmodel.cpp
@@ -56,7 +56,7 @@ struct ScanFoldersModel::PathData
     QString downloadPath; // valid for CUSTOM_LOCATION
 };
 
-ScanFoldersModel *ScanFoldersModel::m_instance = 0;
+ScanFoldersModel *ScanFoldersModel::m_instance = nullptr;
 
 bool ScanFoldersModel::initInstance(QObject *parent)
 {
@@ -72,7 +72,7 @@ void ScanFoldersModel::freeInstance()
 {
     if (m_instance) {
         delete m_instance;
-        m_instance = 0;
+        m_instance = nullptr;
     }
 }
 
@@ -83,7 +83,7 @@ ScanFoldersModel *ScanFoldersModel::instance()
 
 ScanFoldersModel::ScanFoldersModel(QObject *parent)
     : QAbstractListModel(parent)
-    , m_fsWatcher(0)
+    , m_fsWatcher(nullptr)
 {
     configure();
     connect(Preferences::instance(), SIGNAL(changed()), SLOT(configure()));
diff --git a/src/base/scanfoldersmodel.h b/src/base/scanfoldersmodel.h
index 41fd3a288..171996b1a 100644
--- a/src/base/scanfoldersmodel.h
+++ b/src/base/scanfoldersmodel.h
@@ -66,7 +66,7 @@ public:
         CUSTOM_LOCATION
     };
 
-    static bool initInstance(QObject *parent = 0);
+    static bool initInstance(QObject *parent = nullptr);
     static void freeInstance();
     static ScanFoldersModel* instance();
 
@@ -97,7 +97,7 @@ private slots:
     void addTorrentsToSession(const QStringList &pathList);
 
 private:
-    explicit ScanFoldersModel(QObject *parent = 0);
+    explicit ScanFoldersModel(QObject *parent = nullptr);
     ~ScanFoldersModel();
 
     virtual bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole);
diff --git a/src/base/utils/fs.h b/src/base/utils/fs.h
index 9c70477d3..8561bb23a 100644
--- a/src/base/utils/fs.h
+++ b/src/base/utils/fs.h
@@ -52,7 +52,7 @@ namespace Utils
                 , const QString &pad = QLatin1String(" "));
         bool isValidFileSystemName(const QString &name, bool allowSeparators = false);
         qint64 freeDiskSpaceOnPath(const QString &path);
-        QString branchPath(const QString &filePath, QString *removed = 0);
+        QString branchPath(const QString &filePath, QString *removed = nullptr);
         bool sameFileNames(const QString &first, const QString &second);
         QString expandPath(const QString &path);
         QString expandPathAbs(const QString &path);
diff --git a/src/gui/addnewtorrentdialog.cpp b/src/gui/addnewtorrentdialog.cpp
index ce465d089..b51d7f31b 100644
--- a/src/gui/addnewtorrentdialog.cpp
+++ b/src/gui/addnewtorrentdialog.cpp
@@ -148,7 +148,7 @@ AddNewTorrentDialog::AddNewTorrentDialog(const BitTorrent::AddTorrentParams &inP
     // Signal / slots
     connect(ui->adv_button, SIGNAL(clicked(bool)), SLOT(showAdvancedSettings(bool)));
     connect(ui->doNotDeleteTorrentCheckBox, SIGNAL(clicked(bool)), SLOT(doNotDeleteTorrentClicked(bool)));
-    QShortcut *editHotkey = new QShortcut(Qt::Key_F2, ui->contentTreeView, 0, 0, Qt::WidgetShortcut);
+    QShortcut *editHotkey = new QShortcut(Qt::Key_F2, ui->contentTreeView, nullptr, nullptr, Qt::WidgetShortcut);
     connect(editHotkey, SIGNAL(activated()), SLOT(renameSelectedFile()));
     connect(ui->contentTreeView, SIGNAL(doubleClicked(QModelIndex)), SLOT(renameSelectedFile()));
 
@@ -605,7 +605,7 @@ void AddNewTorrentDialog::displayContentTreeMenu(const QPoint &)
 {
     QMenu myFilesLlistMenu;
     const QModelIndexList selectedRows = ui->contentTreeView->selectionModel()->selectedRows(0);
-    QAction *actRename = 0;
+    QAction *actRename = nullptr;
     if (selectedRows.size() == 1) {
         actRename = myFilesLlistMenu.addAction(GuiIconProvider::instance()->getIcon("edit-rename"), tr("Rename..."));
         myFilesLlistMenu.addSeparator();
diff --git a/src/gui/autoexpandabledialog.h b/src/gui/autoexpandabledialog.h
index f3e5d0666..e12e61d92 100644
--- a/src/gui/autoexpandabledialog.h
+++ b/src/gui/autoexpandabledialog.h
@@ -48,7 +48,7 @@ public:
 
     static QString getText(QWidget *parent, const QString &title, const QString &label,
                             QLineEdit::EchoMode mode = QLineEdit::Normal, const QString &text = QString(),
-                            bool *ok = 0, Qt::InputMethodHints inputMethodHints = Qt::ImhNone);
+                            bool *ok = nullptr, Qt::InputMethodHints inputMethodHints = Qt::ImhNone);
 
 protected:
     void showEvent(QShowEvent *e);
diff --git a/src/gui/guiiconprovider.h b/src/gui/guiiconprovider.h
index 665a7fabe..0acc13f92 100644
--- a/src/gui/guiiconprovider.h
+++ b/src/gui/guiiconprovider.h
@@ -52,7 +52,7 @@ private slots:
     void configure();
 
 private:
-    explicit GuiIconProvider(QObject *parent = 0);
+    explicit GuiIconProvider(QObject *parent = nullptr);
     ~GuiIconProvider();
 #if (defined(Q_OS_UNIX) && !defined(Q_OS_MAC))
     QIcon generateDifferentSizes(const QIcon &icon);
diff --git a/src/gui/hidabletabwidget.h b/src/gui/hidabletabwidget.h
index ec169da8f..b6aace6ae 100644
--- a/src/gui/hidabletabwidget.h
+++ b/src/gui/hidabletabwidget.h
@@ -41,7 +41,7 @@
 class HidableTabWidget : public QTabWidget
 {
 public:
-    explicit HidableTabWidget(QWidget *parent = 0)
+    explicit HidableTabWidget(QWidget *parent = nullptr)
         : QTabWidget(parent)
     {
     }
diff --git a/src/gui/loglistwidget.h b/src/gui/loglistwidget.h
index 46147f204..37946538c 100644
--- a/src/gui/loglistwidget.h
+++ b/src/gui/loglistwidget.h
@@ -43,7 +43,7 @@ class LogListWidget: public QListWidget
 
 public:
     // -1 is the portable way to have all the bits set
-    explicit LogListWidget(int maxLines, const Log::MsgTypes &types = Log::ALL, QWidget *parent = 0);
+    explicit LogListWidget(int maxLines, const Log::MsgTypes &types = Log::ALL, QWidget *parent = nullptr);
     void showMsgTypes(const Log::MsgTypes &types);
 
 public slots:
diff --git a/src/gui/mainwindow.cpp b/src/gui/mainwindow.cpp
index a5daa6a15..5449ba0b6 100644
--- a/src/gui/mainwindow.cpp
+++ b/src/gui/mainwindow.cpp
@@ -1045,7 +1045,7 @@ void MainWindow::notifyOfUpdate(QString)
                                    , Log::CRITICAL);
     // Delete the executable watcher
     delete m_executableWatcher;
-    m_executableWatcher = 0;
+    m_executableWatcher = nullptr;
 }
 
 #ifndef Q_OS_MAC
diff --git a/src/gui/mainwindow.h b/src/gui/mainwindow.h
index ebb3ce3fa..ecad73c70 100644
--- a/src/gui/mainwindow.h
+++ b/src/gui/mainwindow.h
@@ -75,7 +75,7 @@ class MainWindow: public QMainWindow
     Q_OBJECT
 
 public:
-    explicit MainWindow(QWidget *parent = 0);
+    explicit MainWindow(QWidget *parent = nullptr);
     ~MainWindow() override;
 
     QWidget *currentTabWidget() const;
diff --git a/src/gui/messageboxraised.h b/src/gui/messageboxraised.h
index d9be5ffbd..7e12b93cc 100644
--- a/src/gui/messageboxraised.h
+++ b/src/gui/messageboxraised.h
@@ -38,7 +38,7 @@ class MessageBoxRaised : public QMessageBox
   Q_OBJECT
 
 private:
-  MessageBoxRaised(QMessageBox::Icon icon, const QString &title, const QString &text, QMessageBox::StandardButtons buttons = NoButton, QWidget *parent = 0, Qt::WindowFlags f = Qt::Dialog|Qt::MSWindowsFixedSizeDialogHint);
+  MessageBoxRaised(QMessageBox::Icon icon, const QString &title, const QString &text, QMessageBox::StandardButtons buttons = NoButton, QWidget *parent = nullptr, Qt::WindowFlags f = Qt::Dialog|Qt::MSWindowsFixedSizeDialogHint);
   MessageBoxRaised();
   MessageBoxRaised(MessageBoxRaised const&);
   void operator=(MessageBoxRaised const&);
diff --git a/src/gui/optionsdlg.h b/src/gui/optionsdlg.h
index d503dc8ec..300a705e9 100644
--- a/src/gui/optionsdlg.h
+++ b/src/gui/optionsdlg.h
@@ -77,7 +77,7 @@ private:
 
 public:
     // Constructor / Destructor
-    OptionsDialog(QWidget *parent = 0);
+    OptionsDialog(QWidget *parent = nullptr);
     ~OptionsDialog();
 
 public slots:
diff --git a/src/gui/powermanagement/powermanagement.h b/src/gui/powermanagement/powermanagement.h
index 435f76a2f..dca50d0f7 100644
--- a/src/gui/powermanagement/powermanagement.h
+++ b/src/gui/powermanagement/powermanagement.h
@@ -48,7 +48,7 @@ class PowerManagement : public QObject
   Q_OBJECT
 
 public:
-  PowerManagement(QObject *parent = 0);
+  PowerManagement(QObject *parent = nullptr);
   virtual ~PowerManagement();
 
   void setActivityState(bool busy);
diff --git a/src/gui/powermanagement/powermanagement_x11.h b/src/gui/powermanagement/powermanagement_x11.h
index 963d57581..8e5f327f3 100644
--- a/src/gui/powermanagement/powermanagement_x11.h
+++ b/src/gui/powermanagement/powermanagement_x11.h
@@ -42,7 +42,7 @@ class PowerManagementInhibitor : public QObject
     Q_OBJECT
 
 public:
-    PowerManagementInhibitor(QObject *parent = 0);
+    PowerManagementInhibitor(QObject *parent = nullptr);
     virtual ~PowerManagementInhibitor();
 
     void RequestIdle();
diff --git a/src/gui/programupdater.h b/src/gui/programupdater.h
index cda228bbb..e24641d28 100644
--- a/src/gui/programupdater.h
+++ b/src/gui/programupdater.h
@@ -39,7 +39,7 @@ class ProgramUpdater: public QObject
     Q_OBJECT
 
 public:
-    explicit ProgramUpdater(QObject *parent = 0, bool invokedByUser = false);
+    explicit ProgramUpdater(QObject *parent = nullptr, bool invokedByUser = false);
 
     void checkForUpdates();
     void updateProgram();
diff --git a/src/gui/properties/peerlistwidget.cpp b/src/gui/properties/peerlistwidget.cpp
index 85ee18ed4..61ff67ee1 100644
--- a/src/gui/properties/peerlistwidget.cpp
+++ b/src/gui/properties/peerlistwidget.cpp
@@ -131,7 +131,7 @@ PeerListWidget::PeerListWidget(PropertiesWidget *parent)
     connect(header(), SIGNAL(customContextMenuRequested(const QPoint&)), this, SLOT(displayToggleColumnsMenu(const QPoint&)));
     connect(header(), SIGNAL(sectionClicked(int)), SLOT(handleSortColumnChanged(int)));
     handleSortColumnChanged(header()->sortIndicatorSection());
-    m_copyHotkey = new QShortcut(QKeySequence::Copy, this, SLOT(copySelectedPeers()), 0, Qt::WidgetShortcut);
+    m_copyHotkey = new QShortcut(QKeySequence::Copy, this, SLOT(copySelectedPeers()), nullptr, Qt::WidgetShortcut);
 
     // This hack fixes reordering of first column with Qt5.
     // https://github.com/qtproject/qtbase/commit/e0fc088c0c8bc61dbcaf5928b24986cd61a22777
@@ -225,7 +225,7 @@ void PeerListWidget::showPeerListMenu(const QPoint &)
     if (!torrent) return;
 
     // Add Peer Action
-    QAction *addPeerAct = 0;
+    QAction *addPeerAct = nullptr;
     if (!torrent->isQueued() && !torrent->isChecking()) {
         addPeerAct = menu.addAction(GuiIconProvider::instance()->getIcon("user-group-new"), tr("Add a new peer..."));
         emptyMenu = false;
diff --git a/src/gui/properties/propertieswidget.cpp b/src/gui/properties/propertieswidget.cpp
index d9635fde9..9b63eb235 100644
--- a/src/gui/properties/propertieswidget.cpp
+++ b/src/gui/properties/propertieswidget.cpp
@@ -163,14 +163,14 @@ PropertiesWidget::PropertiesWidget(QWidget *parent, MainWindow *mainWindow, Tran
     m_refreshTimer = new QTimer(this);
     connect(m_refreshTimer, SIGNAL(timeout()), this, SLOT(loadDynamicData()));
     m_refreshTimer->start(3000); // 3sec
-    m_editHotkeyFile = new QShortcut(Qt::Key_F2, m_ui->filesList, 0, 0, Qt::WidgetShortcut);
+    m_editHotkeyFile = new QShortcut(Qt::Key_F2, m_ui->filesList, nullptr, nullptr, Qt::WidgetShortcut);
     connect(m_editHotkeyFile, SIGNAL(activated()), SLOT(renameSelectedFile()));
-    m_editHotkeyWeb = new QShortcut(Qt::Key_F2, m_ui->listWebSeeds, 0, 0, Qt::WidgetShortcut);
+    m_editHotkeyWeb = new QShortcut(Qt::Key_F2, m_ui->listWebSeeds, nullptr, nullptr, Qt::WidgetShortcut);
     connect(m_editHotkeyWeb, SIGNAL(activated()), SLOT(editWebSeed()));
     connect(m_ui->listWebSeeds, SIGNAL(doubleClicked(QModelIndex)), SLOT(editWebSeed()));
-    m_deleteHotkeyWeb = new QShortcut(QKeySequence::Delete, m_ui->listWebSeeds, 0, 0, Qt::WidgetShortcut);
+    m_deleteHotkeyWeb = new QShortcut(QKeySequence::Delete, m_ui->listWebSeeds, nullptr, nullptr, Qt::WidgetShortcut);
     connect(m_deleteHotkeyWeb, SIGNAL(activated()), SLOT(deleteSelectedUrlSeeds()));
-    m_openHotkeyFile = new QShortcut(Qt::Key_Return, m_ui->filesList, 0, 0, Qt::WidgetShortcut);
+    m_openHotkeyFile = new QShortcut(Qt::Key_Return, m_ui->filesList, nullptr, nullptr, Qt::WidgetShortcut);
     connect(m_openHotkeyFile, SIGNAL(activated()), SLOT(openSelectedFile()));
 }
 
diff --git a/src/gui/properties/trackerlist.cpp b/src/gui/properties/trackerlist.cpp
index 1477f8f03..eeeb37ea2 100644
--- a/src/gui/properties/trackerlist.cpp
+++ b/src/gui/properties/trackerlist.cpp
@@ -112,10 +112,10 @@ TrackerList::TrackerList(PropertiesWidget *properties)
     headerItem()->setTextAlignment(COL_PEERS, (Qt::AlignRight | Qt::AlignVCenter));
     headerItem()->setTextAlignment(COL_DOWNLOADED, (Qt::AlignRight | Qt::AlignVCenter));
     // Set hotkeys
-    m_editHotkey = new QShortcut(Qt::Key_F2, this, SLOT(editSelectedTracker()), 0, Qt::WidgetShortcut);
+    m_editHotkey = new QShortcut(Qt::Key_F2, this, SLOT(editSelectedTracker()), nullptr, Qt::WidgetShortcut);
     connect(this, SIGNAL(doubleClicked(QModelIndex)), SLOT(editSelectedTracker()));
-    m_deleteHotkey = new QShortcut(QKeySequence::Delete, this, SLOT(deleteSelectedTrackers()), 0, Qt::WidgetShortcut);
-    m_copyHotkey = new QShortcut(QKeySequence::Copy, this, SLOT(copyTrackerUrl()), 0, Qt::WidgetShortcut);
+    m_deleteHotkey = new QShortcut(QKeySequence::Delete, this, SLOT(deleteSelectedTrackers()), nullptr, Qt::WidgetShortcut);
+    m_copyHotkey = new QShortcut(QKeySequence::Copy, this, SLOT(copyTrackerUrl()), nullptr, Qt::WidgetShortcut);
 
     // This hack fixes reordering of first column with Qt5.
     // https://github.com/qtproject/qtbase/commit/e0fc088c0c8bc61dbcaf5928b24986cd61a22777
diff --git a/src/gui/qtnotify/notifications.h b/src/gui/qtnotify/notifications.h
index fe975fd27..593dac047 100644
--- a/src/gui/qtnotify/notifications.h
+++ b/src/gui/qtnotify/notifications.h
@@ -31,7 +31,7 @@ public:
     { return "org.freedesktop.Notifications"; }
 
 public:
-    OrgFreedesktopNotificationsInterface(const QString &service, const QString &path, const QDBusConnection &connection, QObject *parent = 0);
+    OrgFreedesktopNotificationsInterface(const QString &service, const QString &path, const QDBusConnection &connection, QObject *parent = nullptr);
 
     ~OrgFreedesktopNotificationsInterface();
 
diff --git a/src/gui/rss/automatedrssdownloader.cpp b/src/gui/rss/automatedrssdownloader.cpp
index 9927a9990..38d8c0867 100644
--- a/src/gui/rss/automatedrssdownloader.cpp
+++ b/src/gui/rss/automatedrssdownloader.cpp
@@ -120,11 +120,11 @@ AutomatedRssDownloader::AutomatedRssDownloader(QWidget *parent)
     connect(m_ui->listRules, &QListWidget::itemSelectionChanged, this, &AutomatedRssDownloader::updateRuleDefinitionBox);
     connect(m_ui->listRules, &QListWidget::itemChanged, this, &AutomatedRssDownloader::handleRuleCheckStateChange);
 
-    m_editHotkey = new QShortcut(Qt::Key_F2, m_ui->listRules, 0, 0, Qt::WidgetShortcut);
+    m_editHotkey = new QShortcut(Qt::Key_F2, m_ui->listRules, nullptr, nullptr, Qt::WidgetShortcut);
     connect(m_editHotkey, &QShortcut::activated, this, &AutomatedRssDownloader::renameSelectedRule);
     connect(m_ui->listRules, &QAbstractItemView::doubleClicked, this, &AutomatedRssDownloader::renameSelectedRule);
 
-    m_deleteHotkey = new QShortcut(QKeySequence::Delete, m_ui->listRules, 0, 0, Qt::WidgetShortcut);
+    m_deleteHotkey = new QShortcut(QKeySequence::Delete, m_ui->listRules, nullptr, nullptr, Qt::WidgetShortcut);
     connect(m_deleteHotkey, &QShortcut::activated, this, &AutomatedRssDownloader::on_removeRuleBtn_clicked);
 
     loadFeedList();
diff --git a/src/gui/rss/rsswidget.cpp b/src/gui/rss/rsswidget.cpp
index ef6dec28a..b243b4957 100644
--- a/src/gui/rss/rsswidget.cpp
+++ b/src/gui/rss/rsswidget.cpp
@@ -93,9 +93,9 @@ RSSWidget::RSSWidget(QWidget *parent)
     loadFoldersOpenState();
     m_feedListWidget->setCurrentItem(m_feedListWidget->stickyUnreadItem());
 
-    m_editHotkey = new QShortcut(Qt::Key_F2, m_feedListWidget, 0, 0, Qt::WidgetShortcut);
+    m_editHotkey = new QShortcut(Qt::Key_F2, m_feedListWidget, nullptr, nullptr, Qt::WidgetShortcut);
     connect(m_editHotkey, &QShortcut::activated, this, &RSSWidget::renameSelectedRSSItem);
-    m_deleteHotkey = new QShortcut(QKeySequence::Delete, m_feedListWidget, 0, 0, Qt::WidgetShortcut);
+    m_deleteHotkey = new QShortcut(QKeySequence::Delete, m_feedListWidget, nullptr, nullptr, Qt::WidgetShortcut);
     connect(m_deleteHotkey, &QShortcut::activated, this, &RSSWidget::deleteSelectedItems);
 
     // Feeds list actions
@@ -388,7 +388,7 @@ void RSSWidget::renameSelectedRSSItem()
 
         QString error;
         if (!RSS::Session::instance()->moveItem(rssItem, RSS::Item::joinPath(parentPath, newName), &error)) {
-            QMessageBox::warning(0, tr("Rename failed"), error);
+            QMessageBox::warning(nullptr, tr("Rename failed"), error);
             ok = false;
         }
     } while (!ok);
diff --git a/src/gui/search/pluginselectdlg.h b/src/gui/search/pluginselectdlg.h
index c67c19cf0..4c1722a4a 100644
--- a/src/gui/search/pluginselectdlg.h
+++ b/src/gui/search/pluginselectdlg.h
@@ -50,7 +50,7 @@ class PluginSelectDlg: public QDialog
     Q_OBJECT
 
 public:
-    explicit PluginSelectDlg(SearchPluginManager *pluginManager, QWidget *parent = 0);
+    explicit PluginSelectDlg(SearchPluginManager *pluginManager, QWidget *parent = nullptr);
     ~PluginSelectDlg();
 
     QList<QTreeWidgetItem*> findItemsWithUrl(QString url);
diff --git a/src/gui/search/pluginsourcedlg.h b/src/gui/search/pluginsourcedlg.h
index f600e90f1..3ae0a4efd 100644
--- a/src/gui/search/pluginsourcedlg.h
+++ b/src/gui/search/pluginsourcedlg.h
@@ -43,7 +43,7 @@ class PluginSourceDlg: public QDialog
     Q_OBJECT
 
 public:
-    explicit PluginSourceDlg(QWidget *parent = 0);
+    explicit PluginSourceDlg(QWidget *parent = nullptr);
     ~PluginSourceDlg();
 
 signals:
diff --git a/src/gui/search/searchsortmodel.h b/src/gui/search/searchsortmodel.h
index e3da49de8..75d80cff7 100644
--- a/src/gui/search/searchsortmodel.h
+++ b/src/gui/search/searchsortmodel.h
@@ -50,7 +50,7 @@ public:
         NB_SEARCH_COLUMNS
     };
 
-    explicit SearchSortModel(QObject *parent = 0);
+    explicit SearchSortModel(QObject *parent = nullptr);
 
     void enableNameFilter(bool enabled);
     void setNameFilter(const QString& searchTerm = QString());
diff --git a/src/gui/torrentcontentfiltermodel.h b/src/gui/torrentcontentfiltermodel.h
index ab9bd10d0..db7aa1bcf 100644
--- a/src/gui/torrentcontentfiltermodel.h
+++ b/src/gui/torrentcontentfiltermodel.h
@@ -40,7 +40,7 @@ class TorrentContentFilterModel: public QSortFilterProxyModel
     Q_OBJECT
 
 public:
-    TorrentContentFilterModel(QObject *parent = 0);
+    TorrentContentFilterModel(QObject *parent = nullptr);
     virtual ~TorrentContentFilterModel();
 
     TorrentContentModel *model() const;
diff --git a/src/gui/torrentcontentmodel.h b/src/gui/torrentcontentmodel.h
index cd6ef3966..60f7f014f 100644
--- a/src/gui/torrentcontentmodel.h
+++ b/src/gui/torrentcontentmodel.h
@@ -47,7 +47,7 @@ class TorrentContentModel: public QAbstractItemModel
     Q_OBJECT
 
 public:
-    TorrentContentModel(QObject *parent = 0);
+    TorrentContentModel(QObject *parent = nullptr);
     ~TorrentContentModel();
 
     void updateFilesProgress(const QVector<qreal> &fp);
diff --git a/src/gui/torrentcontentmodelfolder.cpp b/src/gui/torrentcontentmodelfolder.cpp
index b74f89ded..63227fef6 100644
--- a/src/gui/torrentcontentmodelfolder.cpp
+++ b/src/gui/torrentcontentmodelfolder.cpp
@@ -43,7 +43,7 @@ TorrentContentModelFolder::TorrentContentModelFolder(const QString &name, Torren
 }
 
 TorrentContentModelFolder::TorrentContentModelFolder(const QList<QVariant> &data)
-    : TorrentContentModelItem(0)
+    : TorrentContentModelItem(nullptr)
 {
     Q_ASSERT(data.size() == NB_COL);
     m_itemData = data;
diff --git a/src/gui/torrentcontenttreeview.h b/src/gui/torrentcontenttreeview.h
index 0da6614fc..d5058006d 100644
--- a/src/gui/torrentcontenttreeview.h
+++ b/src/gui/torrentcontenttreeview.h
@@ -36,7 +36,7 @@ class TorrentContentTreeView: public QTreeView
     Q_OBJECT
 
 public:
-    explicit TorrentContentTreeView(QWidget *parent = 0);
+    explicit TorrentContentTreeView(QWidget *parent = nullptr);
     void keyPressEvent(QKeyEvent *event);
 
 private:
diff --git a/src/gui/torrentcreatordlg.h b/src/gui/torrentcreatordlg.h
index 514dedf0c..5a9f7bd0a 100644
--- a/src/gui/torrentcreatordlg.h
+++ b/src/gui/torrentcreatordlg.h
@@ -49,7 +49,7 @@ class TorrentCreatorDlg: public QDialog
     Q_OBJECT
 
 public:
-    TorrentCreatorDlg(QWidget *parent = 0, const QString &defaultPath = QString());
+    TorrentCreatorDlg(QWidget *parent = nullptr, const QString &defaultPath = QString());
     ~TorrentCreatorDlg();
     void updateInputPath(const QString &path);
 
diff --git a/src/gui/torrentmodel.h b/src/gui/torrentmodel.h
index fd9161ec8..e5cc24940 100644
--- a/src/gui/torrentmodel.h
+++ b/src/gui/torrentmodel.h
@@ -83,7 +83,7 @@ public:
         NB_COLUMNS
     };
 
-    explicit TorrentModel(QObject *parent = 0);
+    explicit TorrentModel(QObject *parent = nullptr);
 
     int rowCount(const QModelIndex& index = QModelIndex()) const;
     int columnCount(const QModelIndex &parent=QModelIndex()) const;
diff --git a/src/gui/transferlistfilterswidget.cpp b/src/gui/transferlistfilterswidget.cpp
index f551c2511..423aa9c5b 100644
--- a/src/gui/transferlistfilterswidget.cpp
+++ b/src/gui/transferlistfilterswidget.cpp
@@ -229,7 +229,7 @@ TrackerFiltersList::~TrackerFiltersList()
 void TrackerFiltersList::addItem(const QString &tracker, const QString &hash)
 {
     QStringList tmp;
-    QListWidgetItem *trackerItem = 0;
+    QListWidgetItem *trackerItem = nullptr;
     QString host = getHost(tracker);
     bool exists = m_trackers.contains(host);
 
@@ -460,7 +460,7 @@ void TrackerFiltersList::showMenu(QPoint)
     QAction *startAct = menu.addAction(GuiIconProvider::instance()->getIcon("media-playback-start"), tr("Resume torrents"));
     QAction *pauseAct = menu.addAction(GuiIconProvider::instance()->getIcon("media-playback-pause"), tr("Pause torrents"));
     QAction *deleteTorrentsAct = menu.addAction(GuiIconProvider::instance()->getIcon("edit-delete"), tr("Delete torrents"));
-    QAction *act = 0;
+    QAction *act = nullptr;
     act = menu.exec(QCursor::pos());
 
     if (!act)
@@ -559,7 +559,7 @@ QStringList TrackerFiltersList::getHashes(int row)
 TransferListFiltersWidget::TransferListFiltersWidget(QWidget *parent, TransferListWidget *transferList)
     : QFrame(parent)
     , m_transferList(transferList)
-    , m_trackerFilters(0)
+    , m_trackerFilters(nullptr)
 {
     Preferences* const pref = Preferences::instance();
 
diff --git a/src/gui/transferlistsortmodel.h b/src/gui/transferlistsortmodel.h
index 1e092340d..a4ca13010 100644
--- a/src/gui/transferlistsortmodel.h
+++ b/src/gui/transferlistsortmodel.h
@@ -41,7 +41,7 @@ class TransferListSortModel: public QSortFilterProxyModel
     Q_OBJECT
 
 public:
-    TransferListSortModel(QObject *parent = 0);
+    TransferListSortModel(QObject *parent = nullptr);
 
     void setStatusFilter(TorrentFilter::Type filter);
     void setCategoryFilter(const QString &category);
diff --git a/src/gui/transferlistwidget.cpp b/src/gui/transferlistwidget.cpp
index 4fd07a250..86810ca6a 100644
--- a/src/gui/transferlistwidget.cpp
+++ b/src/gui/transferlistwidget.cpp
@@ -288,11 +288,11 @@ TransferListWidget::TransferListWidget(QWidget *parent, MainWindow *mainWindow)
     connect(header(), SIGNAL(sectionResized(int, int, int)), this, SLOT(saveSettings()));
     connect(header(), SIGNAL(sortIndicatorChanged(int, Qt::SortOrder)), this, SLOT(saveSettings()));
 
-    m_editHotkey = new QShortcut(Qt::Key_F2, this, SLOT(renameSelectedTorrent()), 0, Qt::WidgetShortcut);
-    m_deleteHotkey = new QShortcut(QKeySequence::Delete, this, SLOT(softDeleteSelectedTorrents()), 0, Qt::WidgetShortcut);
-    m_permDeleteHotkey = new QShortcut(Qt::SHIFT + Qt::Key_Delete, this, SLOT(permDeleteSelectedTorrents()), 0, Qt::WidgetShortcut);
-    m_doubleClickHotkey = new QShortcut(Qt::Key_Return, this, SLOT(torrentDoubleClicked()), 0, Qt::WidgetShortcut);
-    m_recheckHotkey = new QShortcut(Qt::CTRL + Qt::Key_R, this, SLOT(recheckSelectedTorrents()), 0, Qt::WidgetShortcut);
+    m_editHotkey = new QShortcut(Qt::Key_F2, this, SLOT(renameSelectedTorrent()), nullptr, Qt::WidgetShortcut);
+    m_deleteHotkey = new QShortcut(QKeySequence::Delete, this, SLOT(softDeleteSelectedTorrents()), nullptr, Qt::WidgetShortcut);
+    m_permDeleteHotkey = new QShortcut(Qt::SHIFT + Qt::Key_Delete, this, SLOT(permDeleteSelectedTorrents()), nullptr, Qt::WidgetShortcut);
+    m_doubleClickHotkey = new QShortcut(Qt::Key_Return, this, SLOT(torrentDoubleClicked()), nullptr, Qt::WidgetShortcut);
+    m_recheckHotkey = new QShortcut(Qt::CTRL + Qt::Key_R, this, SLOT(recheckSelectedTorrents()), nullptr, Qt::WidgetShortcut);
 
     // This hack fixes reordering of first column with Qt5.
     // https://github.com/qtproject/qtbase/commit/e0fc088c0c8bc61dbcaf5928b24986cd61a22777
@@ -859,56 +859,56 @@ void TransferListWidget::displayListMenu(const QPoint&)
     if (selectedIndexes.size() == 0) return;
 
     // Create actions
-    QAction actionStart(GuiIconProvider::instance()->getIcon("media-playback-start"), tr("Resume", "Resume/start the torrent"), 0);
+    QAction actionStart(GuiIconProvider::instance()->getIcon("media-playback-start"), tr("Resume", "Resume/start the torrent"), nullptr);
     connect(&actionStart, SIGNAL(triggered()), this, SLOT(startSelectedTorrents()));
-    QAction actionPause(GuiIconProvider::instance()->getIcon("media-playback-pause"), tr("Pause", "Pause the torrent"), 0);
+    QAction actionPause(GuiIconProvider::instance()->getIcon("media-playback-pause"), tr("Pause", "Pause the torrent"), nullptr);
     connect(&actionPause, SIGNAL(triggered()), this, SLOT(pauseSelectedTorrents()));
-    QAction actionForceStart(GuiIconProvider::instance()->getIcon("media-seek-forward"), tr("Force Resume", "Force Resume/start the torrent"), 0);
+    QAction actionForceStart(GuiIconProvider::instance()->getIcon("media-seek-forward"), tr("Force Resume", "Force Resume/start the torrent"), nullptr);
     connect(&actionForceStart, SIGNAL(triggered()), this, SLOT(forceStartSelectedTorrents()));
-    QAction actionDelete(GuiIconProvider::instance()->getIcon("edit-delete"), tr("Delete", "Delete the torrent"), 0);
+    QAction actionDelete(GuiIconProvider::instance()->getIcon("edit-delete"), tr("Delete", "Delete the torrent"), nullptr);
     connect(&actionDelete, SIGNAL(triggered()), this, SLOT(softDeleteSelectedTorrents()));
-    QAction actionPreview_file(GuiIconProvider::instance()->getIcon("view-preview"), tr("Preview file..."), 0);
+    QAction actionPreview_file(GuiIconProvider::instance()->getIcon("view-preview"), tr("Preview file..."), nullptr);
     connect(&actionPreview_file, SIGNAL(triggered()), this, SLOT(previewSelectedTorrents()));
-    QAction actionSet_max_ratio(QIcon(QLatin1String(":/icons/skin/ratio.png")), tr("Limit share ratio..."), 0);
+    QAction actionSet_max_ratio(QIcon(QLatin1String(":/icons/skin/ratio.png")), tr("Limit share ratio..."), nullptr);
     connect(&actionSet_max_ratio, SIGNAL(triggered()), this, SLOT(setMaxRatioSelectedTorrents()));
-    QAction actionSet_upload_limit(GuiIconProvider::instance()->getIcon("kt-set-max-upload-speed"), tr("Limit upload rate..."), 0);
+    QAction actionSet_upload_limit(GuiIconProvider::instance()->getIcon("kt-set-max-upload-speed"), tr("Limit upload rate..."), nullptr);
     connect(&actionSet_upload_limit, SIGNAL(triggered()), this, SLOT(setUpLimitSelectedTorrents()));
-    QAction actionSet_download_limit(GuiIconProvider::instance()->getIcon("kt-set-max-download-speed"), tr("Limit download rate..."), 0);
+    QAction actionSet_download_limit(GuiIconProvider::instance()->getIcon("kt-set-max-download-speed"), tr("Limit download rate..."), nullptr);
     connect(&actionSet_download_limit, SIGNAL(triggered()), this, SLOT(setDlLimitSelectedTorrents()));
-    QAction actionOpen_destination_folder(GuiIconProvider::instance()->getIcon("inode-directory"), tr("Open destination folder"), 0);
+    QAction actionOpen_destination_folder(GuiIconProvider::instance()->getIcon("inode-directory"), tr("Open destination folder"), nullptr);
     connect(&actionOpen_destination_folder, SIGNAL(triggered()), this, SLOT(openSelectedTorrentsFolder()));
-    QAction actionIncreasePriority(GuiIconProvider::instance()->getIcon("go-up"), tr("Move up", "i.e. move up in the queue"), 0);
+    QAction actionIncreasePriority(GuiIconProvider::instance()->getIcon("go-up"), tr("Move up", "i.e. move up in the queue"), nullptr);
     connect(&actionIncreasePriority, SIGNAL(triggered()), this, SLOT(increasePrioSelectedTorrents()));
-    QAction actionDecreasePriority(GuiIconProvider::instance()->getIcon("go-down"), tr("Move down", "i.e. Move down in the queue"), 0);
+    QAction actionDecreasePriority(GuiIconProvider::instance()->getIcon("go-down"), tr("Move down", "i.e. Move down in the queue"), nullptr);
     connect(&actionDecreasePriority, SIGNAL(triggered()), this, SLOT(decreasePrioSelectedTorrents()));
-    QAction actionTopPriority(GuiIconProvider::instance()->getIcon("go-top"), tr("Move to top", "i.e. Move to top of the queue"), 0);
+    QAction actionTopPriority(GuiIconProvider::instance()->getIcon("go-top"), tr("Move to top", "i.e. Move to top of the queue"), nullptr);
     connect(&actionTopPriority, SIGNAL(triggered()), this, SLOT(topPrioSelectedTorrents()));
-    QAction actionBottomPriority(GuiIconProvider::instance()->getIcon("go-bottom"), tr("Move to bottom", "i.e. Move to bottom of the queue"), 0);
+    QAction actionBottomPriority(GuiIconProvider::instance()->getIcon("go-bottom"), tr("Move to bottom", "i.e. Move to bottom of the queue"), nullptr);
     connect(&actionBottomPriority, SIGNAL(triggered()), this, SLOT(bottomPrioSelectedTorrents()));
-    QAction actionSetTorrentPath(GuiIconProvider::instance()->getIcon("inode-directory"), tr("Set location..."), 0);
+    QAction actionSetTorrentPath(GuiIconProvider::instance()->getIcon("inode-directory"), tr("Set location..."), nullptr);
     connect(&actionSetTorrentPath, SIGNAL(triggered()), this, SLOT(setSelectedTorrentsLocation()));
-    QAction actionForce_recheck(GuiIconProvider::instance()->getIcon("document-edit-verify"), tr("Force recheck"), 0);
+    QAction actionForce_recheck(GuiIconProvider::instance()->getIcon("document-edit-verify"), tr("Force recheck"), nullptr);
     connect(&actionForce_recheck, SIGNAL(triggered()), this, SLOT(recheckSelectedTorrents()));
-    QAction actionForce_reannounce(GuiIconProvider::instance()->getIcon("document-edit-verify"), tr("Force reannounce"), 0);
+    QAction actionForce_reannounce(GuiIconProvider::instance()->getIcon("document-edit-verify"), tr("Force reannounce"), nullptr);
     connect(&actionForce_reannounce, SIGNAL(triggered()), this, SLOT(reannounceSelectedTorrents()));
-    QAction actionCopy_magnet_link(GuiIconProvider::instance()->getIcon("kt-magnet"), tr("Copy magnet link"), 0);
+    QAction actionCopy_magnet_link(GuiIconProvider::instance()->getIcon("kt-magnet"), tr("Copy magnet link"), nullptr);
     connect(&actionCopy_magnet_link, SIGNAL(triggered()), this, SLOT(copySelectedMagnetURIs()));
-    QAction actionCopy_name(GuiIconProvider::instance()->getIcon("edit-copy"), tr("Copy name"), 0);
+    QAction actionCopy_name(GuiIconProvider::instance()->getIcon("edit-copy"), tr("Copy name"), nullptr);
     connect(&actionCopy_name, SIGNAL(triggered()), this, SLOT(copySelectedNames()));
-    QAction actionCopyHash(GuiIconProvider::instance()->getIcon("edit-copy"), tr("Copy hash"), 0);
+    QAction actionCopyHash(GuiIconProvider::instance()->getIcon("edit-copy"), tr("Copy hash"), nullptr);
     connect(&actionCopyHash, &QAction::triggered, this, &TransferListWidget::copySelectedHashes);
-    QAction actionSuper_seeding_mode(tr("Super seeding mode"), 0);
+    QAction actionSuper_seeding_mode(tr("Super seeding mode"), nullptr);
     actionSuper_seeding_mode.setCheckable(true);
     connect(&actionSuper_seeding_mode, SIGNAL(triggered()), this, SLOT(toggleSelectedTorrentsSuperSeeding()));
-    QAction actionRename(GuiIconProvider::instance()->getIcon("edit-rename"), tr("Rename..."), 0);
+    QAction actionRename(GuiIconProvider::instance()->getIcon("edit-rename"), tr("Rename..."), nullptr);
     connect(&actionRename, SIGNAL(triggered()), this, SLOT(renameSelectedTorrent()));
-    QAction actionSequential_download(tr("Download in sequential order"), 0);
+    QAction actionSequential_download(tr("Download in sequential order"), nullptr);
     actionSequential_download.setCheckable(true);
     connect(&actionSequential_download, SIGNAL(triggered()), this, SLOT(toggleSelectedTorrentsSequentialDownload()));
-    QAction actionFirstLastPiece_prio(tr("Download first and last pieces first"), 0);
+    QAction actionFirstLastPiece_prio(tr("Download first and last pieces first"), nullptr);
     actionFirstLastPiece_prio.setCheckable(true);
     connect(&actionFirstLastPiece_prio, SIGNAL(triggered()), this, SLOT(toggleSelectedFirstLastPiecePrio()));
-    QAction actionAutoTMM(tr("Automatic Torrent Management"), 0);
+    QAction actionAutoTMM(tr("Automatic Torrent Management"), nullptr);
     actionAutoTMM.setCheckable(true);
     actionAutoTMM.setToolTip(tr("Automatic mode means that various torrent properties(eg save path) will be decided by the associated category"));
     connect(&actionAutoTMM, SIGNAL(triggered(bool)), this, SLOT(setSelectedAutoTMMEnabled(bool)));
@@ -1111,7 +1111,7 @@ void TransferListWidget::displayListMenu(const QPoint&)
     listMenu.addAction(&actionCopyHash);
     listMenu.addAction(&actionCopy_magnet_link);
     // Call menu
-    QAction *act = 0;
+    QAction *act = nullptr;
     act = listMenu.exec(QCursor::pos());
     if (act) {
         // Parse category & tag actions only (others have slots assigned)
@@ -1146,7 +1146,7 @@ void TransferListWidget::displayListMenu(const QPoint&)
 void TransferListWidget::currentChanged(const QModelIndex& current, const QModelIndex&)
 {
     qDebug("CURRENT CHANGED");
-    BitTorrent::TorrentHandle *torrent = 0;
+    BitTorrent::TorrentHandle *torrent = nullptr;
     if (current.isValid()) {
         torrent = m_listModel->torrentHandle(mapToSource(current));
         // Scroll Fix
diff --git a/src/webui/webapplication.cpp b/src/webui/webapplication.cpp
index 710404823..587ae3e2d 100644
--- a/src/webui/webapplication.cpp
+++ b/src/webui/webapplication.cpp
@@ -114,7 +114,7 @@ namespace
                 QString translation = word;
                 if (isTranslationNeeded) {
                     QString context = regex.cap(4);
-                    translation = qApp->translate(context.toUtf8().constData(), word.constData(), 0, 1);
+                    translation = qApp->translate(context.toUtf8().constData(), word.constData(), nullptr, 1);
                 }
                 // Remove keyboard shortcuts
                 translation.replace(mnemonic, "");