diff --git a/src/app/application.cpp b/src/app/application.cpp
index 9cc1d3558..de322790d 100644
--- a/src/app/application.cpp
+++ b/src/app/application.cpp
@@ -99,10 +99,10 @@ namespace
     // just a shortcut
     inline SettingsStorage *settings() { return  SettingsStorage::instance(); }
 
-    const QString LOG_FOLDER("logs");
-    const char PARAMS_SEPARATOR[] = "|";
+    const QString LOG_FOLDER = QStringLiteral("logs");
+    const QChar PARAMS_SEPARATOR = '|';
 
-    const QString DEFAULT_PORTABLE_MODE_PROFILE_DIR = QLatin1String("profile");
+    const QString DEFAULT_PORTABLE_MODE_PROFILE_DIR = QStringLiteral("profile");
 
     const int MIN_FILELOG_SIZE = 1024; // 1KiB
     const int MAX_FILELOG_SIZE = 1000 * 1024 * 1024; // 1000MiB
@@ -265,7 +265,7 @@ void Application::setFileLoggerAgeType(const int value)
 
 void Application::processMessage(const QString &message)
 {
-    QStringList params = message.split(QLatin1String(PARAMS_SEPARATOR), QString::SkipEmptyParts);
+    QStringList params = message.split(PARAMS_SEPARATOR, QString::SkipEmptyParts);
     // If Application is not running (i.e., other
     // components are not ready) store params
     if (m_running)
@@ -409,7 +409,7 @@ void Application::allTorrentsFinished()
 
 bool Application::sendParams(const QStringList &params)
 {
-    return sendMessage(params.join(QLatin1String(PARAMS_SEPARATOR)));
+    return sendMessage(params.join(PARAMS_SEPARATOR));
 }
 
 // As program parameters, we can get paths or urls.
diff --git a/src/app/cmdoptions.cpp b/src/app/cmdoptions.cpp
index da831d654..5b5762182 100644
--- a/src/app/cmdoptions.cpp
+++ b/src/app/cmdoptions.cpp
@@ -402,7 +402,7 @@ QBtCommandLineParameters parseCommandLine(const QStringList &args)
         const QString &arg = args[i];
 
         if ((arg.startsWith("--") && !arg.endsWith(".torrent"))
-            || (arg.startsWith("-") && (arg.size() == 2))) {
+            || (arg.startsWith('-') && (arg.size() == 2))) {
             // Parse known parameters
             if (arg == SHOW_HELP_OPTION) {
                 result.showHelp = true;
@@ -499,7 +499,7 @@ QString wrapText(const QString &text, int initialIndentation = USAGE_TEXT_COLUMN
 
     foreach (const QString &word, words.mid(1)) {
         if (lines.last().length() + word.length() + 1 < currentLineMaxLength) {
-            lines.last().append(" " + word);
+            lines.last().append(' ' + word);
         }
         else {
             lines.append(QString(initialIndentation, ' ') + word);
diff --git a/src/base/bittorrent/magneturi.cpp b/src/base/bittorrent/magneturi.cpp
index b306792c0..0c37eb139 100644
--- a/src/base/bittorrent/magneturi.cpp
+++ b/src/base/bittorrent/magneturi.cpp
@@ -46,7 +46,7 @@ namespace
         rawBc = rawBc.mid(8); // skip bc://bt/
         rawBc = QByteArray::fromBase64(rawBc); // Decode base64
         // Format is now AA/url_encoded_filename/size_bytes/info_hash/ZZ
-        QStringList parts = QString(rawBc).split("/");
+        QStringList parts = QString(rawBc).split('/');
         if (parts.size() != 5) return QString();
 
         QString filename = parts.at(1);
diff --git a/src/base/bittorrent/peerinfo.cpp b/src/base/bittorrent/peerinfo.cpp
index 92d12cbc2..3db80ceb2 100644
--- a/src/base/bittorrent/peerinfo.cpp
+++ b/src/base/bittorrent/peerinfo.cpp
@@ -377,7 +377,7 @@ void PeerInfo::determineFlags()
 
     // L = Peer is local
     if (fromLSD()) {
-        m_flags += "L";
+        m_flags += 'L';
         flagsDescriptionList += "L = "
                 + tr("peer from LSD");
     }
diff --git a/src/base/bittorrent/session.cpp b/src/base/bittorrent/session.cpp
index 86d54729c..8171d321d 100644
--- a/src/base/bittorrent/session.cpp
+++ b/src/base/bittorrent/session.cpp
@@ -688,7 +688,7 @@ QString Session::torrentTempPath(const TorrentInfo &torrentInfo) const
     if ((torrentInfo.filesCount() > 1) && !torrentInfo.hasRootFolder())
         return tempPath()
             + QString::fromStdString(torrentInfo.nativeInfo()->orig_files().name())
-            + "/";
+            + '/';
 
     return tempPath();
 }
@@ -793,7 +793,7 @@ bool Session::removeCategory(const QString &name)
     bool result = false;
     if (isSubcategoriesEnabled()) {
         // remove subcategories
-        const QString test = name + "/";
+        const QString test = name + '/';
         Dict::removeIf(m_categories, [this, &test, &result](const QString &category, const QString &)
         {
             if (category.startsWith(test)) {
@@ -3664,7 +3664,7 @@ void Session::handleTorrentFinished(TorrentHandle *const torrent)
         const QString torrentRelpath = torrent->filePath(i);
         if (torrentRelpath.endsWith(".torrent", Qt::CaseInsensitive)) {
             qDebug("Found possible recursive torrent download.");
-            const QString torrentFullpath = torrent->savePath(true) + "/" + torrentRelpath;
+            const QString torrentFullpath = torrent->savePath(true) + '/' + torrentRelpath;
             qDebug("Full subtorrent path is %s", qUtf8Printable(torrentFullpath));
             TorrentInfo torrentInfo = TorrentInfo::loadFromFile(torrentFullpath);
             if (torrentInfo.isValid()) {
@@ -3814,7 +3814,7 @@ void Session::recursiveTorrentDownload(const InfoHash &hash)
                         tr("Recursive download of file '%1' embedded in torrent '%2'"
                            , "Recursive download of 'test.torrent' embedded in torrent 'test2'")
                         .arg(Utils::Fs::toNativePath(torrentRelpath), torrent->name()));
-            const QString torrentFullpath = torrent->savePath() + "/" + torrentRelpath;
+            const QString torrentFullpath = torrent->savePath() + '/' + torrentRelpath;
 
             AddTorrentParams params;
             // Passing the save path along to the sub torrent file
@@ -4309,7 +4309,7 @@ void Session::handleListenSucceededAlert(libt::listen_succeeded_alert *p)
         proto = "TCP";
     else if (p->sock_type == libt::listen_succeeded_alert::tcp_ssl)
         proto = "TCP_SSL";
-    qDebug() << "Successfully listening on " << proto << p->endpoint.address().to_string(ec).c_str() << "/" << p->endpoint.port();
+    qDebug() << "Successfully listening on " << proto << p->endpoint.address().to_string(ec).c_str() << '/' << p->endpoint.port();
     Logger::instance()->addMessage(
         tr("qBittorrent is successfully listening on interface %1 port: %2/%3", "e.g: qBittorrent is successfully listening on interface 192.168.0.1 port: TCP/6881")
             .arg(p->endpoint.address().to_string(ec).c_str(), proto, QString::number(p->endpoint.port())), Log::INFO);
@@ -4336,7 +4336,7 @@ void Session::handleListenFailedAlert(libt::listen_failed_alert *p)
         proto = "I2P";
     else if (p->sock_type == libt::listen_failed_alert::socks5)
         proto = "SOCKS5";
-    qDebug() << "Failed listening on " << proto << p->endpoint.address().to_string(ec).c_str() << "/" << p->endpoint.port();
+    qDebug() << "Failed listening on " << proto << p->endpoint.address().to_string(ec).c_str() << '/' << p->endpoint.port();
     Logger::instance()->addMessage(
         tr("qBittorrent failed listening on interface %1 port: %2/%3. Reason: %4.",
             "e.g: qBittorrent failed listening on interface 192.168.0.1 port: TCP/6881. Reason: already in use.")
diff --git a/src/base/bittorrent/torrentcreatorthread.cpp b/src/base/bittorrent/torrentcreatorthread.cpp
index 85b2b3150..30a05dee6 100644
--- a/src/base/bittorrent/torrentcreatorthread.cpp
+++ b/src/base/bittorrent/torrentcreatorthread.cpp
@@ -89,7 +89,7 @@ void TorrentCreatorThread::run()
     emit updateProgress(0);
 
     try {
-        const QString parentPath = Utils::Fs::branchPath(m_params.inputPath) + "/";
+        const QString parentPath = Utils::Fs::branchPath(m_params.inputPath) + '/';
 
         // Adding files to the torrent
         libt::file_storage fs;
diff --git a/src/base/bittorrent/torrenthandle.cpp b/src/base/bittorrent/torrenthandle.cpp
index cb6efb875..7a729a1ad 100644
--- a/src/base/bittorrent/torrenthandle.cpp
+++ b/src/base/bittorrent/torrenthandle.cpp
@@ -328,7 +328,7 @@ QString TorrentHandle::rootPath(bool actual) const
         return QString();
 
     QString firstFilePath = filePath(0);
-    const int slashIndex = firstFilePath.indexOf("/");
+    const int slashIndex = firstFilePath.indexOf('/');
     if (slashIndex >= 0)
         return QDir(savePath(actual)).absoluteFilePath(firstFilePath.left(slashIndex));
     else
@@ -556,7 +556,7 @@ bool TorrentHandle::belongsToCategory(const QString &category) const
 
     if (m_category == category) return true;
 
-    if (m_session->isSubcategoriesEnabled() && m_category.startsWith(category + "/"))
+    if (m_session->isSubcategoriesEnabled() && m_category.startsWith(category + '/'))
         return true;
 
     return false;
@@ -1683,12 +1683,12 @@ void TorrentHandle::handleFileRenamedAlert(const libtorrent::file_renamed_alert
     // TODO: Check this!
     if (filesCount() > 1) {
         // Check if folders were renamed
-        QStringList oldPathParts = m_torrentInfo.origFilePath(p->index).split("/");
+        QStringList oldPathParts = m_torrentInfo.origFilePath(p->index).split('/');
         oldPathParts.removeLast();
-        QString oldPath = oldPathParts.join("/");
-        QStringList newPathParts = newName.split("/");
+        QString oldPath = oldPathParts.join('/');
+        QStringList newPathParts = newName.split('/');
         newPathParts.removeLast();
-        QString newPath = newPathParts.join("/");
+        QString newPath = newPathParts.join('/');
         if (!newPathParts.isEmpty() && (oldPath != newPath)) {
             qDebug("oldPath(%s) != newPath(%s)", qUtf8Printable(oldPath), qUtf8Printable(newPath));
             oldPath = QString("%1/%2").arg(savePath(true), oldPath);
@@ -2018,7 +2018,7 @@ void TorrentHandle::prioritizeFiles(const QVector<int> &priorities)
             // Make sure the file does not already exists
             if (QDir(parentAbsPath).dirName() != ".unwanted") {
                 QString unwantedAbsPath = parentAbsPath + "/.unwanted";
-                QString newAbsPath = unwantedAbsPath + "/" + Utils::Fs::fileName(filepath);
+                QString newAbsPath = unwantedAbsPath + '/' + Utils::Fs::fileName(filepath);
                 qDebug() << "Unwanted path is" << unwantedAbsPath;
                 if (QFile::exists(newAbsPath)) {
                     qWarning() << "File" << newAbsPath << "already exists at destination.";
@@ -2038,8 +2038,8 @@ void TorrentHandle::prioritizeFiles(const QVector<int> &priorities)
                 }
 #endif
                 QString parentPath = Utils::Fs::branchPath(filepath);
-                if (!parentPath.isEmpty() && !parentPath.endsWith("/"))
-                    parentPath += "/";
+                if (!parentPath.isEmpty() && !parentPath.endsWith('/'))
+                    parentPath += '/';
                 renameFile(i, parentPath + ".unwanted/" + Utils::Fs::fileName(filepath));
             }
         }
@@ -2056,8 +2056,8 @@ void TorrentHandle::prioritizeFiles(const QVector<int> &priorities)
                     renameFile(i, QDir(newRelPath).filePath(oldName));
 
                 // Remove .unwanted directory if empty
-                qDebug() << "Attempting to remove .unwanted folder at " << QDir(spath + "/" + newRelPath).absoluteFilePath(".unwanted");
-                QDir(spath + "/" + newRelPath).rmdir(".unwanted");
+                qDebug() << "Attempting to remove .unwanted folder at " << QDir(spath + '/' + newRelPath).absoluteFilePath(".unwanted");
+                QDir(spath + '/' + newRelPath).rmdir(".unwanted");
             }
         }
     }
diff --git a/src/base/bittorrent/tracker.cpp b/src/base/bittorrent/tracker.cpp
index c95f24e56..601f06c38 100644
--- a/src/base/bittorrent/tracker.cpp
+++ b/src/base/bittorrent/tracker.cpp
@@ -60,7 +60,7 @@ bool Peer::operator==(const Peer &other) const
 
 QString Peer::uid() const
 {
-    return ip + ":" + QString::number(port);
+    return ip + ':' + QString::number(port);
 }
 
 libtorrent::entry Peer::toEntry(bool noPeerId) const
diff --git a/src/base/net/dnsupdater.cpp b/src/base/net/dnsupdater.cpp
index aefab36f1..422b07888 100644
--- a/src/base/net/dnsupdater.cpp
+++ b/src/base/net/dnsupdater.cpp
@@ -181,7 +181,7 @@ void DNSUpdater::processIPUpdateReply(const QString &reply)
 {
     Logger *const logger = Logger::instance();
     qDebug() << Q_FUNC_INFO << reply;
-    QString code = reply.split(" ").first();
+    QString code = reply.split(' ').first();
     qDebug() << Q_FUNC_INFO << "Code:" << code;
 
     if ((code == "good") || (code == "nochg")) {
diff --git a/src/base/net/smtp.cpp b/src/base/net/smtp.cpp
index e8069f15d..691ba1890 100644
--- a/src/base/net/smtp.cpp
+++ b/src/base/net/smtp.cpp
@@ -299,7 +299,7 @@ QByteArray Smtp::encodeMimeHeader(const QString &key, const QString &value, QTex
             if (firstWord)
                 line += word;
             else
-                line += " " + word;
+                line += ' ' + word;
             firstWord = false;
         }
     }
@@ -423,7 +423,7 @@ void Smtp::authenticate()
         // Skip authentication
         logError("The SMTP server does not seem to support any of the authentications modes "
                  "we support [CRAM-MD5|PLAIN|LOGIN], skipping authentication, "
-                 "knowing it is likely to fail... Server Auth Modes: " + auth.join("|"));
+                 "knowing it is likely to fail... Server Auth Modes: " + auth.join('|'));
         m_state = Authenticated;
         // At this point the server will not send any response
         // So fill the buffer with a fake one to pass the tests
@@ -503,7 +503,7 @@ void Smtp::authLogin()
 void Smtp::logError(const QString &msg)
 {
     qDebug() << "Email Notification Error:" << msg;
-    Logger::instance()->addMessage(tr("Email Notification Error:") + " " + msg, Log::CRITICAL);
+    Logger::instance()->addMessage(tr("Email Notification Error:") + ' ' + msg, Log::CRITICAL);
 }
 
 QString Smtp::getCurrentDateTime() const
@@ -529,7 +529,7 @@ QString Smtp::getCurrentDateTime() const
     std::snprintf(buf, sizeof(buf), "%+05d", timeOffset);
     QString timeOffsetStr = buf;
 
-    QString ret = weekDayStr + ", " + dayStr + " " + monthStr + " " + yearStr + " " + timeStr + " " + timeOffsetStr;
+    QString ret = weekDayStr + ", " + dayStr + ' ' + monthStr + ' ' + yearStr + ' ' + timeStr + ' ' + timeOffsetStr;
     return ret;
 }
 
diff --git a/src/base/preferences.cpp b/src/base/preferences.cpp
index d3e6138bd..b02b1e5b5 100644
--- a/src/base/preferences.cpp
+++ b/src/base/preferences.cpp
@@ -256,7 +256,7 @@ void Preferences::setWinStartup(bool b)
 {
     QSettings settings("HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Run", QSettings::NativeFormat);
     if (b) {
-        const QString binPath = "\"" + Utils::Fs::toNativePath(qApp->applicationFilePath()) + "\"";
+        const QString binPath = '"' + Utils::Fs::toNativePath(qApp->applicationFilePath()) + '"';
         settings.setValue("qBittorrent", binPath);
     }
     else {
@@ -500,7 +500,7 @@ void Preferences::setWebUiAuthSubnetWhitelist(QStringList subnets)
 
 QString Preferences::getServerDomains() const
 {
-    return value("Preferences/WebUI/ServerDomains", "*").toString();
+    return value("Preferences/WebUI/ServerDomains", '*').toString();
 }
 
 void Preferences::setServerDomains(const QString &str)
@@ -510,7 +510,7 @@ void Preferences::setServerDomains(const QString &str)
 
 QString Preferences::getWebUiAddress() const
 {
-    return value("Preferences/WebUI/Address", "*").toString().trimmed();
+    return value("Preferences/WebUI/Address", '*').toString().trimmed();
 }
 
 void Preferences::setWebUiAddress(const QString &addr)
@@ -987,7 +987,7 @@ QString Preferences::getPythonPath()
     // Fallback: Detect python from default locations
     const QStringList dirs = QDir("C:/").entryList(QStringList("Python*"), QDir::Dirs, QDir::Name | QDir::Reversed);
     foreach (const QString &dir, dirs) {
-        const QString path("C:/" + dir + "/");
+        const QString path("C:/" + dir + '/');
         if (QFile::exists(path + "python.exe"))
             return path;
     }
@@ -1058,8 +1058,8 @@ void Preferences::setMagnetLinkAssoc(bool set)
 
     // Magnet association
     if (set) {
-        const QString commandStr = "\"" + qApp->applicationFilePath() + "\" \"%1\"";
-        const QString iconStr = "\"" + qApp->applicationFilePath() + "\",1";
+        const QString commandStr = '"' + qApp->applicationFilePath() + "\" \"%1\"";
+        const QString iconStr = '"' + qApp->applicationFilePath() + "\",1";
 
         settings.setValue("magnet/Default", "URL:Magnet link");
         settings.setValue("magnet/Content Type", "application/x-magnet");
diff --git a/src/base/rss/rss_autodownloadrule.cpp b/src/base/rss/rss_autodownloadrule.cpp
index 294bb528e..f7dbfc5af 100644
--- a/src/base/rss/rss_autodownloadrule.cpp
+++ b/src/base/rss/rss_autodownloadrule.cpp
@@ -502,7 +502,7 @@ void AutoDownloadRule::setMustContain(const QString &tokens)
     if (m_dataPtr->useRegex)
         m_dataPtr->mustContain = QStringList() << tokens;
     else
-        m_dataPtr->mustContain = tokens.split("|");
+        m_dataPtr->mustContain = tokens.split('|');
 
     // Check for single empty string - if so, no condition
     if ((m_dataPtr->mustContain.size() == 1) && m_dataPtr->mustContain[0].isEmpty())
@@ -516,7 +516,7 @@ void AutoDownloadRule::setMustNotContain(const QString &tokens)
     if (m_dataPtr->useRegex)
         m_dataPtr->mustNotContain = QStringList() << tokens;
     else
-        m_dataPtr->mustNotContain = tokens.split("|");
+        m_dataPtr->mustNotContain = tokens.split('|');
 
     // Check for single empty string - if so, no condition
     if ((m_dataPtr->mustNotContain.size() == 1) && m_dataPtr->mustNotContain[0].isEmpty())
@@ -605,12 +605,12 @@ int AutoDownloadRule::ignoreDays() const
 
 QString AutoDownloadRule::mustContain() const
 {
-    return m_dataPtr->mustContain.join("|");
+    return m_dataPtr->mustContain.join('|');
 }
 
 QString AutoDownloadRule::mustNotContain() const
 {
-    return m_dataPtr->mustNotContain.join("|");
+    return m_dataPtr->mustNotContain.join('|');
 }
 
 bool AutoDownloadRule::useSmartFilter() const
diff --git a/src/base/search/searchhandler.cpp b/src/base/search/searchhandler.cpp
index 8547087be..d2c518787 100644
--- a/src/base/search/searchhandler.cpp
+++ b/src/base/search/searchhandler.cpp
@@ -65,13 +65,13 @@ SearchHandler::SearchHandler(const QString &pattern, const QString &category, co
 
     const QStringList params {
         Utils::Fs::toNativePath(m_manager->engineLocation() + "/nova2.py"),
-        m_usedPlugins.join(","),
+        m_usedPlugins.join(','),
         m_category
     };
 
     // Launch search
     m_searchProcess->setProgram(Utils::ForeignApps::pythonInfo().executableName);
-    m_searchProcess->setArguments(params + m_pattern.split(" "));
+    m_searchProcess->setArguments(params + m_pattern.split(' '));
 
 #if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
     connect(m_searchProcess, &QProcess::errorOccurred, this, &SearchHandler::processFailed);
@@ -161,7 +161,7 @@ void SearchHandler::processFailed()
 // file url | file name | file size | nb seeds | nb leechers | Search engine url
 bool SearchHandler::parseSearchResult(const QString &line, SearchResult &searchResult)
 {
-    const QStringList parts = line.split("|");
+    const QStringList parts = line.split('|');
     const int nbFields = parts.size();
     if (nbFields < (NB_PLUGIN_COLUMNS - 1)) return false; // -1 because desc_link is optional
 
diff --git a/src/base/search/searchpluginmanager.cpp b/src/base/search/searchpluginmanager.cpp
index a72eb0472..e920b836d 100644
--- a/src/base/search/searchpluginmanager.cpp
+++ b/src/base/search/searchpluginmanager.cpp
@@ -204,7 +204,7 @@ void SearchPluginManager::installPlugin(const QString &source)
             path = QUrl(path).toLocalFile();
 
         QString pluginName = Utils::Fs::fileName(path);
-        pluginName.chop(pluginName.size() - pluginName.lastIndexOf("."));
+        pluginName.chop(pluginName.size() - pluginName.lastIndexOf('.'));
 
         if (!path.endsWith(".py", Qt::CaseInsensitive))
             emit pluginInstallationFailed(pluginName, tr("Unknown search engine plugin file format."));
@@ -375,7 +375,7 @@ void SearchPluginManager::pluginDownloaded(const QString &url, QString filePath)
     filePath = Utils::Fs::fromNativePath(filePath);
 
     QString pluginName = Utils::Fs::fileName(url);
-    pluginName.chop(pluginName.size() - pluginName.lastIndexOf(".")); // Remove extension
+    pluginName.chop(pluginName.size() - pluginName.lastIndexOf('.')); // Remove extension
     installPlugin_impl(pluginName, filePath);
     Utils::Fs::forceRemove(filePath);
 }
@@ -502,13 +502,13 @@ void SearchPluginManager::parseVersionInfo(const QByteArray &info)
     foreach (QByteArray line, lines) {
         line = line.trimmed();
         if (line.isEmpty()) continue;
-        if (line.startsWith("#")) continue;
+        if (line.startsWith('#')) continue;
 
         QList<QByteArray> list = line.split(' ');
         if (list.size() != 2) continue;
 
         QString pluginName = QString(list.first());
-        if (!pluginName.endsWith(":")) continue;
+        if (!pluginName.endsWith(':')) continue;
 
         pluginName.chop(1); // remove trailing ':'
         PluginVersion version = PluginVersion::tryParse(list.last(), {});
diff --git a/src/base/utils/fs.cpp b/src/base/utils/fs.cpp
index 39f99a222..1a22eab0b 100644
--- a/src/base/utils/fs.cpp
+++ b/src/base/utils/fs.cpp
@@ -78,14 +78,14 @@ QString Utils::Fs::fromNativePath(const QString &path)
 QString Utils::Fs::fileExtension(const QString &filename)
 {
     QString ext = QString(filename).remove(QB_EXT);
-    const int pointIndex = ext.lastIndexOf(".");
+    const int pointIndex = ext.lastIndexOf('.');
     return (pointIndex >= 0) ? ext.mid(pointIndex + 1) : QString();
 }
 
 QString Utils::Fs::fileName(const QString &filePath)
 {
     QString path = fromNativePath(filePath);
-    const int slashIndex = path.lastIndexOf("/");
+    const int slashIndex = path.lastIndexOf('/');
     if (slashIndex == -1)
         return path;
     return path.mid(slashIndex + 1);
@@ -94,7 +94,7 @@ QString Utils::Fs::fileName(const QString &filePath)
 QString Utils::Fs::folderName(const QString &filePath)
 {
     QString path = fromNativePath(filePath);
-    const int slashIndex = path.lastIndexOf("/");
+    const int slashIndex = path.lastIndexOf('/');
     if (slashIndex == -1)
         return path;
     return path.left(slashIndex);
@@ -121,13 +121,13 @@ bool Utils::Fs::smartRemoveEmptyFolderTree(const QString &path)
     };
 
     // travel from the deepest folder and remove anything unwanted on the way out.
-    QStringList dirList(path + "/");  // get all sub directories paths
+    QStringList dirList(path + '/');  // get all sub directories paths
     QDirIterator iter(path, (QDir::AllDirs | QDir::NoDotAndDotDot), QDirIterator::Subdirectories);
     while (iter.hasNext())
-        dirList << iter.next() + "/";
+        dirList << iter.next() + '/';
     // sort descending by directory depth
     std::sort(dirList.begin(), dirList.end()
-              , [](const QString &l, const QString &r) { return l.count("/") > r.count("/"); });
+              , [](const QString &l, const QString &r) { return l.count('/') > r.count('/'); });
 
     for (const QString &p : qAsConst(dirList)) {
         // remove unwanted files
@@ -139,7 +139,7 @@ bool Utils::Fs::smartRemoveEmptyFolderTree(const QString &path)
         QDir dir(p);
         QStringList tmpFileList = dir.entryList(QDir::Files);
         for (const QString &f : tmpFileList) {
-            if (f.endsWith("~"))
+            if (f.endsWith('~'))
                 forceRemove(p + f);
         }
 
@@ -246,9 +246,9 @@ qint64 Utils::Fs::freeDiskSpaceOnPath(const QString &path)
 QString Utils::Fs::branchPath(const QString &filePath, QString *removed)
 {
     QString ret = fromNativePath(filePath);
-    if (ret.endsWith("/"))
+    if (ret.endsWith('/'))
         ret.chop(1);
-    const int slashIndex = ret.lastIndexOf("/");
+    const int slashIndex = ret.lastIndexOf('/');
     if (slashIndex >= 0) {
         if (removed)
             *removed = ret.mid(slashIndex + 1);
diff --git a/src/base/utils/misc.cpp b/src/base/utils/misc.cpp
index 212445d5e..72dbb840d 100644
--- a/src/base/utils/misc.cpp
+++ b/src/base/utils/misc.cpp
@@ -501,7 +501,7 @@ void Utils::Misc::openFolderSelect(const QString &absolutePath)
     const QString path = Utils::Fs::fromNativePath(absolutePath);
     // If the item to select doesn't exist, try to open its parent
     if (!QFileInfo::exists(path)) {
-        openPath(path.left(path.lastIndexOf("/")));
+        openPath(path.left(path.lastIndexOf('/')));
         return;
     }
 #ifdef Q_OS_WIN
@@ -540,10 +540,10 @@ void Utils::Misc::openFolderSelect(const QString &absolutePath)
     }
     else {
         // "caja" manager can't pinpoint the file, see: https://github.com/qbittorrent/qBittorrent/issues/5003
-        openPath(path.left(path.lastIndexOf("/")));
+        openPath(path.left(path.lastIndexOf('/')));
     }
 #else
-    openPath(path.left(path.lastIndexOf("/")));
+    openPath(path.left(path.lastIndexOf('/')));
 #endif
 }
 
diff --git a/src/gui/addnewtorrentdialog.cpp b/src/gui/addnewtorrentdialog.cpp
index 5b9021cd2..30dc31d97 100644
--- a/src/gui/addnewtorrentdialog.cpp
+++ b/src/gui/addnewtorrentdialog.cpp
@@ -445,7 +445,7 @@ void AddNewTorrentDialog::updateDiskSpaceLabel()
     sizeString += " (";
     sizeString += tr("Free space on disk: %1").arg(Utils::Misc::friendlyUnit(Utils::Fs::freeDiskSpaceOnPath(
                                                                    m_ui->savePath->selectedPath())));
-    sizeString += ")";
+    sizeString += ')';
     m_ui->labelSize->setText(sizeString);
 }
 
diff --git a/src/gui/mainwindow.cpp b/src/gui/mainwindow.cpp
index f84641d42..396e4a087 100644
--- a/src/gui/mainwindow.cpp
+++ b/src/gui/mainwindow.cpp
@@ -2037,7 +2037,7 @@ bool MainWindow::addPythonPathToEnv()
         QString pathEnvar = QString::fromLocal8Bit(qgetenv("PATH").constData());
         if (pathEnvar.isNull())
             pathEnvar = "";
-        pathEnvar = pythonPath + ";" + pathEnvar;
+        pathEnvar = pythonPath + ';' + pathEnvar;
         qDebug("New PATH envvar is: %s", qUtf8Printable(pathEnvar));
         qputenv("PATH", Utils::Fs::toNativePath(pathEnvar).toLocal8Bit());
         return true;
@@ -2069,7 +2069,7 @@ void MainWindow::pythonDownloadSuccess(const QString &url, const QString &filePa
 
     if (QSysInfo::windowsVersion() >= QSysInfo::WV_VISTA) {
         QFile::rename(filePath, filePath + ".exe");
-        installer.start("\"" + Utils::Fs::toNativePath(filePath) + ".exe\" /passive");
+        installer.start('"' + Utils::Fs::toNativePath(filePath) + ".exe\" /passive");
     }
     else {
         QFile::rename(filePath, filePath + ".msi");
diff --git a/src/gui/previewlistdelegate.h b/src/gui/previewlistdelegate.h
index f26090c49..f8dea8270 100644
--- a/src/gui/previewlistdelegate.h
+++ b/src/gui/previewlistdelegate.h
@@ -70,7 +70,7 @@ public:
                 QStyleOptionProgressBar newopt;
                 qreal progress = index.data().toDouble() * 100.;
                 newopt.rect = opt.rect;
-                newopt.text = ((progress == 100.0) ? QString("100%") : Utils::String::fromDouble(progress, 1) + "%");
+                newopt.text = ((progress == 100.0) ? QString("100%") : Utils::String::fromDouble(progress, 1) + '%');
                 newopt.progress = static_cast<int>(progress);
                 newopt.maximum = 100;
                 newopt.minimum = 0;
diff --git a/src/gui/properties/peerlistdelegate.h b/src/gui/properties/peerlistdelegate.h
index 29db78c9a..93f7f88f5 100644
--- a/src/gui/properties/peerlistdelegate.h
+++ b/src/gui/properties/peerlistdelegate.h
@@ -100,7 +100,7 @@ public:
         case RELEVANCE: {
                 qreal progress = index.data().toDouble();
                 opt.displayAlignment = Qt::AlignRight | Qt::AlignVCenter;
-                QItemDelegate::drawDisplay(painter, opt, opt.rect, Utils::String::fromDouble(progress * 100.0, 1) + "%");
+                QItemDelegate::drawDisplay(painter, opt, opt.rect, Utils::String::fromDouble(progress * 100.0, 1) + '%');
             }
             break;
         default:
diff --git a/src/gui/properties/peerlistwidget.cpp b/src/gui/properties/peerlistwidget.cpp
index 000c0d6ba..8f579ed7e 100644
--- a/src/gui/properties/peerlistwidget.cpp
+++ b/src/gui/properties/peerlistwidget.cpp
@@ -304,9 +304,9 @@ void PeerListWidget::copySelectedPeers()
         QString ip = m_listModel->data(m_listModel->index(row, PeerListDelegate::IP_HIDDEN)).toString();
         QString myport = m_listModel->data(m_listModel->index(row, PeerListDelegate::PORT)).toString();
         if (ip.indexOf('.') == -1) // IPv6
-            selectedPeers << "[" + ip + "]:" + myport;
+            selectedPeers << '[' + ip + "]:" + myport;
         else // IPv4
-            selectedPeers << ip + ":" + myport;
+            selectedPeers << ip + ':' + myport;
     }
     QApplication::clipboard()->setText(selectedPeers.join('\n'));
 }
@@ -404,8 +404,8 @@ QStandardItem *PeerListWidget::addPeer(const QString &ip, BitTorrent::TorrentHan
     m_listModel->setData(m_listModel->index(row, PeerListDelegate::TOT_UP), peer.totalUpload());
     m_listModel->setData(m_listModel->index(row, PeerListDelegate::RELEVANCE), peer.relevance());
     QStringList downloadingFiles(torrent->info().filesForPiece(peer.downloadingPieceIndex()));
-    m_listModel->setData(m_listModel->index(row, PeerListDelegate::DOWNLOADING_PIECE), downloadingFiles.join(QLatin1String(";")));
-    m_listModel->setData(m_listModel->index(row, PeerListDelegate::DOWNLOADING_PIECE), downloadingFiles.join(QLatin1String("\n")), Qt::ToolTipRole);
+    m_listModel->setData(m_listModel->index(row, PeerListDelegate::DOWNLOADING_PIECE), downloadingFiles.join(QLatin1Char(';')));
+    m_listModel->setData(m_listModel->index(row, PeerListDelegate::DOWNLOADING_PIECE), downloadingFiles.join(QLatin1Char('\n')), Qt::ToolTipRole);
 
     return m_listModel->item(row, PeerListDelegate::IP);
 }
diff --git a/src/gui/properties/propertieswidget.cpp b/src/gui/properties/propertieswidget.cpp
index e0573a5ce..2a19a600f 100644
--- a/src/gui/properties/propertieswidget.cpp
+++ b/src/gui/properties/propertieswidget.cpp
@@ -474,7 +474,7 @@ void PropertiesWidget::loadDynamicData()
 
                 // Progress
                 qreal progress = m_torrent->progress() * 100.;
-                m_ui->labelProgressVal->setText(Utils::String::fromDouble(progress, 1) + "%");
+                m_ui->labelProgressVal->setText(Utils::String::fromDouble(progress, 1) + '%');
                 m_downloadedPieces->setProgress(m_torrent->pieces(), m_torrent->downloadingPieces());
             }
             else {
diff --git a/src/gui/properties/proplistdelegate.cpp b/src/gui/properties/proplistdelegate.cpp
index 075e617b8..f748f6462 100644
--- a/src/gui/properties/proplistdelegate.cpp
+++ b/src/gui/properties/proplistdelegate.cpp
@@ -87,7 +87,7 @@ void PropListDelegate::paint(QPainter *painter, const QStyleOptionViewItem &opti
             QStyleOptionProgressBar newopt;
             qreal progress = index.data().toDouble() * 100.;
             newopt.rect = opt.rect;
-            newopt.text = ((progress == 100.0) ? QString("100%") : Utils::String::fromDouble(progress, 1) + "%");
+            newopt.text = ((progress == 100.0) ? QString("100%") : Utils::String::fromDouble(progress, 1) + '%');
             newopt.progress = int(progress);
             newopt.maximum = 100;
             newopt.minimum = 0;
diff --git a/src/gui/properties/trackerlistwidget.cpp b/src/gui/properties/trackerlistwidget.cpp
index 998c727d3..d4e131a86 100644
--- a/src/gui/properties/trackerlistwidget.cpp
+++ b/src/gui/properties/trackerlistwidget.cpp
@@ -371,9 +371,9 @@ void TrackerListWidget::loadTrackers()
         item->setText(COL_PEERS, QString::number(entry.nativeEntry().scrape_incomplete > 0 ? entry.nativeEntry().scrape_incomplete : 0));
         item->setText(COL_DOWNLOADED, QString::number(entry.nativeEntry().scrape_downloaded > 0 ? entry.nativeEntry().scrape_downloaded : 0));
 #else
-        item->setText(COL_SEEDS, "0");
-        item->setText(COL_PEERS, "0");
-        item->setText(COL_DOWNLOADED, "0");
+        item->setText(COL_SEEDS, '0');
+        item->setText(COL_PEERS, '0');
+        item->setText(COL_DOWNLOADED, '0');
 #endif
 
         item->setTextAlignment(COL_TIER, (Qt::AlignRight | Qt::AlignVCenter));
diff --git a/src/gui/rss/automatedrssdownloader.cpp b/src/gui/rss/automatedrssdownloader.cpp
index da7ca8ab1..12124f1ad 100644
--- a/src/gui/rss/automatedrssdownloader.cpp
+++ b/src/gui/rss/automatedrssdownloader.cpp
@@ -675,7 +675,7 @@ void AutomatedRssDownloader::updateMustLineValidity()
         if (isRegex)
             tokens << text;
         else
-            foreach (const QString &token, text.split("|"))
+            foreach (const QString &token, text.split('|'))
                 tokens << Utils::String::wildcardToRegex(token);
 
         foreach (const QString &token, tokens) {
@@ -713,7 +713,7 @@ void AutomatedRssDownloader::updateMustNotLineValidity()
         if (isRegex)
             tokens << text;
         else
-            foreach (const QString &token, text.split("|"))
+            foreach (const QString &token, text.split('|'))
                 tokens << Utils::String::wildcardToRegex(token);
 
         foreach (const QString &token, tokens) {
diff --git a/src/gui/statusbar.cpp b/src/gui/statusbar.cpp
index 93a8d71de..ce61ec2fb 100644
--- a/src/gui/statusbar.cpp
+++ b/src/gui/statusbar.cpp
@@ -209,14 +209,14 @@ void StatusBar::updateSpeedLabels()
     QString speedLbl = Utils::Misc::friendlyUnit(sessionStatus.payloadDownloadRate, true);
     int speedLimit = BitTorrent::Session::instance()->downloadSpeedLimit();
     if (speedLimit)
-        speedLbl += " [" + Utils::Misc::friendlyUnit(speedLimit, true) + "]";
-    speedLbl += " (" + Utils::Misc::friendlyUnit(sessionStatus.totalPayloadDownload) + ")";
+        speedLbl += " [" + Utils::Misc::friendlyUnit(speedLimit, true) + ']';
+    speedLbl += " (" + Utils::Misc::friendlyUnit(sessionStatus.totalPayloadDownload) + ')';
     m_dlSpeedLbl->setText(speedLbl);
     speedLimit = BitTorrent::Session::instance()->uploadSpeedLimit();
     speedLbl = Utils::Misc::friendlyUnit(sessionStatus.payloadUploadRate, true);
     if (speedLimit)
-        speedLbl += " [" + Utils::Misc::friendlyUnit(speedLimit, true) + "]";
-    speedLbl += " (" + Utils::Misc::friendlyUnit(sessionStatus.totalPayloadUpload) + ")";
+        speedLbl += " [" + Utils::Misc::friendlyUnit(speedLimit, true) + ']';
+    speedLbl += " (" + Utils::Misc::friendlyUnit(sessionStatus.totalPayloadUpload) + ')';
     m_upSpeedLbl->setText(speedLbl);
 }
 
diff --git a/src/gui/tagfiltermodel.cpp b/src/gui/tagfiltermodel.cpp
index 818b72d5a..8dcb6181d 100644
--- a/src/gui/tagfiltermodel.cpp
+++ b/src/gui/tagfiltermodel.cpp
@@ -39,16 +39,16 @@ namespace
 {
     QString getSpecialAllTag()
     {
-        static const QString *const ALL_TAG = new QString(" ");
-        Q_ASSERT(!BitTorrent::Session::isValidTag(*ALL_TAG));
-        return *ALL_TAG;
+        const QString ALL_TAG = QLatin1String(" ");
+        Q_ASSERT(!BitTorrent::Session::isValidTag(ALL_TAG));
+        return ALL_TAG;
     }
 
     QString getSpecialUntaggedTag()
     {
-        static const QString *const UNTAGGED_TAG = new QString("  ");
-        Q_ASSERT(!BitTorrent::Session::isValidTag(*UNTAGGED_TAG));
-        return *UNTAGGED_TAG;
+        const QString UNTAGGED_TAG = QLatin1String("  ");
+        Q_ASSERT(!BitTorrent::Session::isValidTag(UNTAGGED_TAG));
+        return UNTAGGED_TAG;
     }
 }
 
diff --git a/src/gui/transferlistdelegate.cpp b/src/gui/transferlistdelegate.cpp
index 584ead328..5e8f0b756 100644
--- a/src/gui/transferlistdelegate.cpp
+++ b/src/gui/transferlistdelegate.cpp
@@ -91,7 +91,7 @@ void TransferListDelegate::paint(QPainter *painter, const QStyleOptionViewItem &
             qlonglong total = index.data(Qt::UserRole).toLongLong();
             if (hideValues && (!value && !total))
                 break;
-            QString display = QString::number(value) + " (" + QString::number(total) + ")";
+            QString display = QString::number(value) + " (" + QString::number(total) + ')';
             opt.displayAlignment = Qt::AlignRight | Qt::AlignVCenter;
             QItemDelegate::drawDisplay(painter, opt, opt.rect, display);
         }
@@ -160,7 +160,7 @@ void TransferListDelegate::paint(QPainter *painter, const QStyleOptionViewItem &
             QStyleOptionProgressBar newopt;
             qreal progress = index.data().toDouble() * 100.;
             newopt.rect = opt.rect;
-            newopt.text = ((progress == 100.0) ? QString("100%") : Utils::String::fromDouble(progress, 1) + "%");
+            newopt.text = ((progress == 100.0) ? QString("100%") : Utils::String::fromDouble(progress, 1) + '%');
             newopt.progress = static_cast<int>(progress);
             newopt.maximum = 100;
             newopt.minimum = 0;
diff --git a/src/gui/transferlistmodel.cpp b/src/gui/transferlistmodel.cpp
index f6b81a90e..adfd8773d 100644
--- a/src/gui/transferlistmodel.cpp
+++ b/src/gui/transferlistmodel.cpp
@@ -93,7 +93,7 @@ QVariant TransferListModel::headerData(int section, Qt::Orientation orientation,
     if (orientation == Qt::Horizontal) {
         if (role == Qt::DisplayRole) {
             switch (section) {
-            case TR_PRIORITY: return "#";
+            case TR_PRIORITY: return QChar('#');
             case TR_NAME: return tr("Name", "i.e: torrent name");
             case TR_SIZE: return tr("Size", "i.e: torrent size");
             case TR_PROGRESS: return tr("Done", "% Done");
diff --git a/src/gui/utils.cpp b/src/gui/utils.cpp
index e2279687a..08ca7b59b 100644
--- a/src/gui/utils.cpp
+++ b/src/gui/utils.cpp
@@ -73,7 +73,7 @@ QPixmap Utils::Gui::scaledPixmap(const QString &path, const QWidget *widget, con
 QPixmap Utils::Gui::scaledPixmapSvg(const QString &path, const QWidget *widget, const int baseHeight)
 {
     const int scaledHeight = baseHeight * Utils::Gui::screenScalingFactor(widget);
-    const QString normalizedKey = path + "@" + QString::number(scaledHeight);
+    const QString normalizedKey = path + '@' + QString::number(scaledHeight);
 
     QPixmap pm;
     QPixmapCache cache;
diff --git a/src/webui/api/synccontroller.cpp b/src/webui/api/synccontroller.cpp
index a90e69a93..d8fe4d464 100644
--- a/src/webui/api/synccontroller.cpp
+++ b/src/webui/api/synccontroller.cpp
@@ -465,7 +465,7 @@ void SyncController::torrentPeersAction()
         peer[KEY_PEER_RELEVANCE] = pi.relevance();
         peer[KEY_PEER_FILES] = torrent->info().filesForPiece(pi.downloadingPieceIndex()).join(QLatin1String("\n"));
 
-        peers[pi.address().ip.toString() + ":" + QString::number(pi.address().port)] = peer;
+        peers[pi.address().ip.toString() + ':' + QString::number(pi.address().port)] = peer;
     }
 
     data["peers"] = peers;
diff --git a/src/webui/api/torrentscontroller.cpp b/src/webui/api/torrentscontroller.cpp
index 12ddcddfb..99e043638 100644
--- a/src/webui/api/torrentscontroller.cpp
+++ b/src/webui/api/torrentscontroller.cpp
@@ -734,16 +734,16 @@ void TorrentsController::setLocationAction()
 {
     checkParams({"hashes", "location"});
 
-    const QStringList hashes {params()["hashes"].split("|")};
+    const QStringList hashes {params()["hashes"].split('|')};
     const QString newLocation {params()["location"].trimmed()};
 
     if (newLocation.isEmpty())
         throw APIError(APIErrorType::BadParams, tr("Save path is empty"));
-        
+
     // try to create the location if it does not exist
     if (!QDir(newLocation).mkpath("."))
         throw APIError(APIErrorType::Conflict, tr("Cannot make save path"));
-    
+
     // check permissions
     if (!QFileInfo(newLocation).isWritable())
         throw APIError(APIErrorType::AccessDenied, tr("Cannot write to directory"));