diff --git a/core/config/project_settings.cpp b/core/config/project_settings.cpp
index 5c4bcc687a9..ec74d7ea286 100644
--- a/core/config/project_settings.cpp
+++ b/core/config/project_settings.cpp
@@ -1183,10 +1183,14 @@ ProjectSettings::ProjectSettings() {
 	GLOBAL_DEF("application/config/custom_user_dir_name", "");
 	GLOBAL_DEF("application/config/project_settings_override", "");
 
-	GLOBAL_DEF_BASIC("display/window/size/viewport_width", 1024);
+	// The default window size is tuned to:
+	// - Have a 16:9 aspect ratio,
+	// - Have both dimensions divisible by 8 to better play along with video recording,
+	// - Be displayable correctly in windowed mode on a 1366×768 display (tested on Windows 10 with default settings).
+	GLOBAL_DEF_BASIC("display/window/size/viewport_width", 1152);
 	custom_prop_info["display/window/size/viewport_width"] = PropertyInfo(Variant::INT, "display/window/size/viewport_width", PROPERTY_HINT_RANGE, "0,7680,1,or_greater"); // 8K resolution
 
-	GLOBAL_DEF_BASIC("display/window/size/viewport_height", 600);
+	GLOBAL_DEF_BASIC("display/window/size/viewport_height", 648);
 	custom_prop_info["display/window/size/viewport_height"] = PropertyInfo(Variant::INT, "display/window/size/viewport_height", PROPERTY_HINT_RANGE, "0,4320,1,or_greater"); // 8K resolution
 
 	GLOBAL_DEF_BASIC("display/window/size/resizable", true);
diff --git a/doc/classes/ProjectSettings.xml b/doc/classes/ProjectSettings.xml
index 680ddf341e7..fcde9f66864 100644
--- a/doc/classes/ProjectSettings.xml
+++ b/doc/classes/ProjectSettings.xml
@@ -578,19 +578,19 @@
 			Allows the window to be resizable by default.
 			[b]Note:[/b] This setting is ignored on iOS.
 		</member>
-		<member name="display/window/size/viewport_height" type="int" setter="" getter="" default="600">
-			Sets the game's main viewport height. On desktop platforms, this is also the initial window height.
+		<member name="display/window/size/viewport_height" type="int" setter="" getter="" default="648">
+			Sets the game's main viewport height. On desktop platforms, this is also the initial window height, represented by an indigo-colored rectangle in the 2D editor. Stretch mode settings also use this as a reference when using the [code]canvas_items[/code] or [code]viewport[/code] stretch modes. See also [member display/window/size/viewport_width], [member display/window/size/window_width_override] and [member display/window/size/window_height_override].
 		</member>
-		<member name="display/window/size/viewport_width" type="int" setter="" getter="" default="1024">
-			Sets the game's main viewport width. On desktop platforms, this is also the initial window width.
+		<member name="display/window/size/viewport_width" type="int" setter="" getter="" default="1152">
+			Sets the game's main viewport width. On desktop platforms, this is also the initial window width, represented by an indigo-colored rectangle in the 2D editor. Stretch mode settings also use this as a reference when using the [code]canvas_items[/code] or [code]viewport[/code] stretch modes. See also [member display/window/size/viewport_height], [member display/window/size/window_width_override] and [member display/window/size/window_height_override].
 		</member>
 		<member name="display/window/size/window_height_override" type="int" setter="" getter="" default="0">
-			On desktop platforms, sets the game's initial window height.
-			[b]Note:[/b] By default, or when set to 0, the initial window height is the [member display/window/size/viewport_height]. This setting is ignored on iOS, Android, and HTML5.
+			On desktop platforms, overrides the game's initial window height. See also [member display/window/size/window_width_override], [member display/window/size/viewport_width] and [member display/window/size/viewport_height].
+			[b]Note:[/b] By default, or when set to [code]0[/code], the initial window height is the [member display/window/size/viewport_height]. This setting is ignored on iOS, Android, and HTML5.
 		</member>
 		<member name="display/window/size/window_width_override" type="int" setter="" getter="" default="0">
-			On desktop platforms, sets the game's initial window width.
-			[b]Note:[/b] By default, or when set to 0, the initial window width is the viewport [member display/window/size/viewport_width]. This setting is ignored on iOS, Android, and HTML5.
+			On desktop platforms, overrides the game's initial window width. See also [member display/window/size/window_height_override], [member display/window/size/viewport_width] and [member display/window/size/viewport_height].
+			[b]Note:[/b] By default, or when set to [code]0[/code], the initial window width is the viewport [member display/window/size/viewport_width]. This setting is ignored on iOS, Android, and HTML5.
 		</member>
 		<member name="display/window/vsync/vsync_mode" type="int" setter="" getter="" default="1">
 			Sets the V-Sync mode for the main game window.
diff --git a/main/main.cpp b/main/main.cpp
index 9e7d9e6f5a9..6559b69f2ed 100644
--- a/main/main.cpp
+++ b/main/main.cpp
@@ -161,7 +161,7 @@ static DisplayServer::WindowMode window_mode = DisplayServer::WINDOW_MODE_WINDOW
 static DisplayServer::ScreenOrientation window_orientation = DisplayServer::SCREEN_LANDSCAPE;
 static DisplayServer::VSyncMode window_vsync_mode = DisplayServer::VSYNC_ENABLED;
 static uint32_t window_flags = 0;
-static Size2i window_size = Size2i(1024, 600);
+static Size2i window_size = Size2i(1152, 648);
 
 static int init_screen = -1;
 static bool init_fullscreen = false;