diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3b69bf6..86acc9e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -32,5 +32,6 @@ add_subdirectory(chotkeys)
 add_subdirectory(cupdatecursor)
 add_subdirectory(gmenuproxy)
 add_subdirectory(notificationd)
+add_subdirectory(sddm-helper)
 
 install(FILES cutefish DESTINATION /etc/ COMPONENT Runtime)
diff --git a/sddm-helper/CMakeLists.txt b/sddm-helper/CMakeLists.txt
new file mode 100644
index 0000000..a694795
--- /dev/null
+++ b/sddm-helper/CMakeLists.txt
@@ -0,0 +1,24 @@
+project(cutefish-sddm-helper)
+set(PROJECT_NAME cutefish-sddm-helper)
+
+set(SRCS
+    main.cpp
+)
+
+add_executable(${PROJECT_NAME}
+    ${SRCS}
+)
+
+target_link_libraries(${PROJECT_NAME}
+        Qt5::Core
+        Qt5::Gui
+)
+
+configure_file(
+    com.cutefish.sddm.helper.pkexec.policy.in
+    com.cutefish.sddm.helper.pkexec.policy
+    @ONLY
+)
+
+install(TARGETS ${PROJECT_NAME} RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/com.cutefish.sddm.helper.pkexec.policy DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/polkit-1/actions/)
diff --git a/sddm-helper/com.cutefish.sddm.helper.pkexec.policy.in b/sddm-helper/com.cutefish.sddm.helper.pkexec.policy.in
new file mode 100644
index 0000000..346e66b
--- /dev/null
+++ b/sddm-helper/com.cutefish.sddm.helper.pkexec.policy.in
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE policyconfig PUBLIC
+ "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN"
+ "http://www.freedesktop.org/standards/PolicyKit/1/policyconfig.dtd">
+<policyconfig>
+  <action id="com.cutefish.sddm.helper.pkexec">
+    <message>Authentication is required to SDDM DPI</message>
+    <icon_name>battery</icon_name>
+    <defaults>
+      <allow_any>no</allow_any>
+      <allow_inactive>no</allow_inactive>
+      <allow_active>yes</allow_active>
+    </defaults>
+    <annotate key="org.freedesktop.policykit.exec.path">@CMAKE_INSTALL_FULL_BINDIR@/cutefish-sddm-helper</annotate>
+  </action>
+</policyconfig>
diff --git a/sddm-helper/main.cpp b/sddm-helper/main.cpp
new file mode 100644
index 0000000..26b2193
--- /dev/null
+++ b/sddm-helper/main.cpp
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2021 CutefishOS Team.
+ *
+ * Author:     Kate Leet (kate@cutefishos.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <QCommandLineParser>
+#include <QFile>
+#include <QDir>
+#include <QSettings>
+#include <QDebug>
+
+int main(int argc, char *argv[])
+{
+    QCoreApplication app(argc, argv);
+    QCommandLineParser parser;
+    parser.addHelpOption();
+    parser.addVersionOption();
+
+    QCommandLineOption dpiOption(QStringLiteral("dpi"), QStringLiteral("Set DPI"));
+    parser.addOption(dpiOption);
+    parser.addPositionalArgument("value", "Value");
+
+    parser.process(app);
+
+    if (parser.isSet(dpiOption)) {
+        int value = parser.positionalArguments().value(0).toInt();
+        int minValue = 96;
+
+        if (value < minValue)
+            value = minValue;
+
+        QDir dir("/etc/sddm.conf.d");
+
+        if (!dir.exists()) {
+            dir.mkpath("/etc/sddm.conf.d");
+        }
+
+        QSettings settings("/etc/sddm.conf.d/dpi.conf", QSettings::IniFormat);
+        settings.beginGroup("X11");
+        settings.setValue("ServerArguments", QString("-nolisten tcp -dpi %1").arg(value));
+    }
+
+    return 0;
+}
diff --git a/settings-daemon/theme/thememanager.cpp b/settings-daemon/theme/thememanager.cpp
index b4eda9a..0df82b9 100644
--- a/settings-daemon/theme/thememanager.cpp
+++ b/settings-daemon/theme/thememanager.cpp
@@ -216,6 +216,14 @@ void ThemeManager::setDevicePixelRatio(qreal ratio)
     m_settings->sync();
     applyXResources();
 
+    // SDDM
+    QProcess p;
+    p.setProgram("pkexec");
+    p.setArguments(QStringList() << "cutefish-sddm-helper"
+                                 << "--dpi" << QString::number(fontDpi));
+    p.start();
+    p.waitForFinished(-1);
+
     QDBusInterface iface("org.freedesktop.Notifications",
                          "/org/freedesktop/Notifications",
                          "org.freedesktop.Notifications",