diff --git a/config b/config
new file mode 100644
index 0000000..054bf6b
--- /dev/null
+++ b/config
@@ -0,0 +1 @@
+{"window_size":[1917.00000000,1098.00000000]}
\ No newline at end of file
diff --git a/src/project.odin b/src/formats.odin
similarity index 55%
rename from src/project.odin
rename to src/formats.odin
index 8d09a98..4aac48a 100644
--- a/src/project.odin
+++ b/src/formats.odin
@@ -18,3 +18,17 @@ project_write :: proc(project: ^ProjectData, path: string) -> ProjectWriteError
 project_read :: proc(project: ^ProjectData, path: string) -> ProjectReadError {
 	return _project_read(project, path)
 }
+
+CONFIG_FILE_NAME :: "config"
+
+ConfigData :: struct {
+	window_size: v2,
+}
+
+config_write :: proc(config: ConfigData, temp_allocator := context.temp_allocator) -> ConfigWriteError {
+	return _config_write(config)
+}
+
+config_read :: proc(temp_allocator := context.temp_allocator) -> (config: ConfigData, error: ConfigReadError) {
+	return _config_read(temp_allocator)
+}
diff --git a/src/project_default.odin b/src/formats_default.odin
similarity index 75%
rename from src/project_default.odin
rename to src/formats_default.odin
index 9b7c61b..5828b78 100644
--- a/src/project_default.odin
+++ b/src/formats_default.odin
@@ -6,6 +6,7 @@ package game
 import "core:os"
 import "core:io"
 import "core:mem"
+import "core:encoding/json"
 
 ProjectReadErrorType :: enum {
 	FailedReadingHeader,
@@ -63,3 +64,25 @@ _project_read :: proc(project: ^ProjectData, path: string) -> ProjectReadError {
 	_ = io.read_ptr(r, &project.shapes, size_of(project.shapes)) or_return
 	return nil
 }
+
+ConfigWriteError :: union {
+	json.Marshal_Error,
+	os.Error,
+}
+
+_config_write :: proc(config: ConfigData, temp_allocator := context.temp_allocator) -> ConfigWriteError {
+	data := json.marshal(config, allocator = temp_allocator) or_return
+	os.write_entire_file(CONFIG_FILE_NAME, data) or_return
+	return nil
+}
+
+ConfigReadError :: union {
+	os.Error,
+	json.Unmarshal_Error,
+}
+
+_config_read :: proc(temp_allocator := context.temp_allocator) -> (config: ConfigData, error: ConfigReadError) {
+	data := os.read_entire_file(CONFIG_FILE_NAME, temp_allocator) or_return
+	json.unmarshal(data, &config, allocator = temp_allocator) or_return
+	return config, nil
+}
diff --git a/src/project_web.odin b/src/formats_web.odin
similarity index 51%
rename from src/project_web.odin
rename to src/formats_web.odin
index 1a35c02..037e4b1 100644
--- a/src/project_web.odin
+++ b/src/formats_web.odin
@@ -24,3 +24,27 @@ _project_write :: proc(project: ^ProjectData, path: string) -> ProjectWriteError
 _project_read :: proc(project: ^ProjectData, path: string) -> ProjectReadError {
 	return ProjectReadErrorType.LoadingProjectNotSupportedOnWeb;
 }
+
+ConfigWriteErrorType :: enum {
+	WritingConfigNotSupportedOnWeb,
+}
+
+ConfigWriteError :: union {
+	ConfigWriteErrorType,
+}
+
+ConfigReadErrorType :: enum {
+	ReadingConfigNotSupportedOnWeb,
+}
+
+ConfigReadError :: union {
+	ConfigReadErrorType,
+}
+
+_config_write :: proc(config: ConfigData, temp_allocator := context.temp_allocator) -> ConfigWriteError {
+	return .WritingConfigNotSupportedOnWeb
+}
+
+_config_read :: proc(temp_allocator := context.temp_allocator) -> (config: ConfigData, error: ConfigReadError) {
+	return {}, .ReadingConfigNotSupportedOnWeb
+}
diff --git a/src/main.odin b/src/main.odin
index bfac4fe..b11cb4c 100644
--- a/src/main.odin
+++ b/src/main.odin
@@ -35,6 +35,7 @@ shutdown :: proc() {
 should_run :: proc() -> bool {
 	when ODIN_OS != .JS {
 		if program.window_should_close || rl.WindowShouldClose() {
+			program_config_write()
 			return false
 		}
 	}
diff --git a/src/program.odin b/src/program.odin
index 6709ba9..2567b65 100644
--- a/src/program.odin
+++ b/src/program.odin
@@ -435,15 +435,26 @@ program_init :: proc(allocator := context.allocator) {
 	if err := program_load_project(&program, default_project_load_location); err != nil {
 		mem.copy(&program.project_save_string[0], raw_data(default_project_load_location), len(default_project_load_location))
 	}
+
+	when ODIN_OS != .JS {
+		config, error := config_read()
+		if error != nil {
+			error := program_config_write()
+			if error != nil {
+				program_show_dialog(&program, .Error, fmt.caprint("Error: Couldn't write config file\n", typeid_of(type_of(error)), ".", error, sep = ""))
+			}
+		} else {
+			rl.SetWindowSize(i32(config.window_size.x), i32(config.window_size.y))
+		}
+	}
 }
 
-program_get_master_matrix :: proc() -> mat3 {
-	matrices := (cast([^]mat3)raw_data(program.matrix_float_pool))[:program.matrix_count]
-	master_matrix := linalg.identity_matrix(mat3)
-	#reverse for mat in matrices {
-		master_matrix *= mat
+program_config_write :: proc() -> ConfigWriteError {
+	config := ConfigData{
+		window_size = program_screen_size()
 	}
-	return master_matrix
+	config_write(config) or_return
+	return nil
 }
 
 program_set_animation_state :: proc(state: ProgramAnimationState) {