diff --git a/CHANGELOG.md b/CHANGELOG.md
index 82f4a511cf6..0a8b5eaa4c0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,6 +30,7 @@
 - Minor: Links can now have prefixes and suffixes such as parentheses. (#5486, #5515)
 - Minor: Added support for scrolling in splits with touchscreen panning gestures. (#5524)
 - Minor: Removed experimental IRC support. (#5547)
+- Minor: Remember last popup size for next popup. (#5635)
 - Minor: Moderators can now see which mods start and cancel raids. (#5563)
 - Minor: The emote popup now reloads when Twitch emotes are reloaded. (#5580)
 - Minor: Added `--login <username>` CLI argument to specify which account to start logged in as. (#5626)
diff --git a/src/common/ChatterinoSetting.hpp b/src/common/ChatterinoSetting.hpp
index 6dab1a0c654..35d538b138a 100644
--- a/src/common/ChatterinoSetting.hpp
+++ b/src/common/ChatterinoSetting.hpp
@@ -3,6 +3,7 @@
 #include "util/QMagicEnum.hpp"
 
 #include <pajlada/settings.hpp>
+#include <QSize>
 #include <QString>
 
 namespace chatterino {
@@ -55,6 +56,7 @@ using DoubleSetting = ChatterinoSetting<double>;
 using IntSetting = ChatterinoSetting<int>;
 using StringSetting = ChatterinoSetting<std::string>;
 using QStringSetting = ChatterinoSetting<QString>;
+using QSizeSetting = ChatterinoSetting<QSize>;
 
 template <typename Enum>
 class EnumSetting
diff --git a/src/singletons/Settings.hpp b/src/singletons/Settings.hpp
index 3566815e87e..94366dabe3e 100644
--- a/src/singletons/Settings.hpp
+++ b/src/singletons/Settings.hpp
@@ -212,6 +212,10 @@ class Settings
     BoolSetting useCustomFfzVipBadges = {
         "/appearance/badges/useCustomFfzVipBadges", true};
     BoolSetting showBadgesSevenTV = {"/appearance/badges/seventv", true};
+    QSizeSetting lastPopupSize = {
+        "/appearance/lastPopup/size",
+        {300, 500},
+    };
 
     /// Behaviour
     BoolSetting allowDuplicateMessages = {"/behaviour/allowDuplicateMessages",
diff --git a/src/util/RapidJsonSerializeQSize.hpp b/src/util/RapidJsonSerializeQSize.hpp
new file mode 100644
index 00000000000..c5cff37783f
--- /dev/null
+++ b/src/util/RapidJsonSerializeQSize.hpp
@@ -0,0 +1,52 @@
+#pragma once
+
+#include "util/RapidjsonHelpers.hpp"
+
+#include <pajlada/serialize.hpp>
+#include <QSize>
+
+namespace pajlada {
+
+template <>
+struct Serialize<QSize> {
+    static rapidjson::Value get(const QSize &value,
+                                rapidjson::Document::AllocatorType &a)
+    {
+        rapidjson::Value ret(rapidjson::kObjectType);
+
+        chatterino::rj::set(ret, "width", value.width(), a);
+        chatterino::rj::set(ret, "height", value.height(), a);
+
+        return ret;
+    }
+};
+
+template <>
+struct Deserialize<QSize> {
+    static QSize get(const rapidjson::Value &value, bool *error = nullptr)
+    {
+        if (!value.IsObject())
+        {
+            PAJLADA_REPORT_ERROR(error);
+            return {};
+        }
+
+        int width{};
+        int height{};
+
+        if (!chatterino::rj::getSafe(value, "width", width))
+        {
+            PAJLADA_REPORT_ERROR(error);
+            return {};
+        }
+        if (!chatterino::rj::getSafe(value, "height", height))
+        {
+            PAJLADA_REPORT_ERROR(error);
+            return {};
+        }
+
+        return {width, height};
+    }
+};
+
+}  // namespace pajlada
diff --git a/src/widgets/Window.cpp b/src/widgets/Window.cpp
index c095c9c28a2..4dcb1450317 100644
--- a/src/widgets/Window.cpp
+++ b/src/widgets/Window.cpp
@@ -18,6 +18,7 @@
 #include "singletons/Updates.hpp"
 #include "singletons/WindowManager.hpp"
 #include "util/InitUpdateButton.hpp"
+#include "util/RapidJsonSerializeQSize.hpp"
 #include "widgets/AccountSwitchPopup.hpp"
 #include "widgets/dialogs/SettingsDialog.hpp"
 #include "widgets/dialogs/switcher/QuickSwitcherPopup.hpp"
@@ -75,7 +76,13 @@ Window::Window(WindowType type, QWidget *parent)
     }
     else
     {
-        this->resize(int(300 * this->scale()), int(500 * this->scale()));
+        auto lastPopup = getSettings()->lastPopupSize.getValue();
+        if (lastPopup.isEmpty())
+        {
+            // The size in the setting was invalid, use the default value
+            lastPopup = getSettings()->lastPopupSize.getDefaultValue();
+        }
+        this->resize(lastPopup.width(), lastPopup.height());
     }
 
     this->signalHolder_.managedConnect(getApp()->getHotkeys()->onItemsUpdated,
@@ -142,7 +149,12 @@ void Window::closeEvent(QCloseEvent *)
         getApp()->getWindows()->save();
         getApp()->getWindows()->closeAll();
     }
-
+    else
+    {
+        QRect rect = this->getBounds();
+        QSize newSize(rect.width(), rect.height());
+        getSettings()->lastPopupSize.setValue(newSize);
+    }
     // Ensure selectedWindow_ is never an invalid pointer.
     // WindowManager will return the main window if no window is pointed to by
     // `selectedWindow_`.