diff --git a/CHANGELOG.md b/CHANGELOG.md
index d57c9b7..453e1cf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,6 +26,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
   ([#77][i77])
 - User can define own keybindings in `os.UserConfigDir()/sointu/keybindings.yml`
   ([#94][i94], [#151][i151])
+- User can define preferred window size in
+  `os.UserConfigDir()/sointu/preferences.yml` ([#184][i184])
 - A small number above the instrument name identifies the MIDI channel /
   instrument number, with numbering starting from 1 ([#154][i154])
 - The filter unit frequency parameter is displayed in Hz, corresponding roughly
diff --git a/tracker/gioui/keyevent.go b/tracker/gioui/keyevent.go
index b7e2f96..eaa990c 100644
--- a/tracker/gioui/keyevent.go
+++ b/tracker/gioui/keyevent.go
@@ -3,8 +3,6 @@ package gioui
 import (
 	_ "embed"
 	"fmt"
-	"os"
-	"path/filepath"
 	"strconv"
 	"strings"
 
@@ -28,16 +26,7 @@ var keyActionMap = map[KeyAction]string{} // holds an informative string of the
 
 func loadCustomKeyBindings() []KeyBinding {
 	var keyBindings []KeyBinding
-	configDir, err := os.UserConfigDir()
-	if err != nil {
-		return nil
-	}
-	path := filepath.Join(configDir, "sointu", "keybindings.yml")
-	bytes, err := os.ReadFile(path)
-	if err != nil {
-		return nil
-	}
-	err = yaml.Unmarshal(bytes, &keyBindings)
+	_, err := ReadCustomConfigYml("keybindings.yml", &keyBindings)
 	if err != nil {
 		return nil
 	}
diff --git a/tracker/gioui/preferences.go b/tracker/gioui/preferences.go
new file mode 100644
index 0000000..c66e95c
--- /dev/null
+++ b/tracker/gioui/preferences.go
@@ -0,0 +1,65 @@
+package gioui
+
+import (
+	_ "embed"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"gopkg.in/yaml.v2"
+
+	"gioui.org/unit"
+)
+
+type (
+	Preferences struct {
+		Window   WindowPreferences
+		YmlError error
+	}
+
+	WindowPreferences struct {
+		Width     int
+		Height    int
+		Maximized bool `yaml:",omitempty"`
+	}
+)
+
+//go:embed preferences.yml
+var defaultPreferencesYaml []byte
+
+func loadDefaultPreferences() Preferences {
+	var preferences Preferences
+	err := yaml.Unmarshal(defaultPreferencesYaml, &preferences)
+	if err != nil {
+		panic(fmt.Errorf("failed to unmarshal preferences: %w", err))
+	}
+	return preferences
+}
+
+// ReadCustomConfigYml modifies the target argument, i.e. needs a pointer
+func ReadCustomConfigYml(filename string, target interface{}) (exists bool, err error) {
+	configDir, err := os.UserConfigDir()
+	if err != nil {
+		return false, err
+	}
+	path := filepath.Join(configDir, "sointu", filename)
+	bytes, err2 := os.ReadFile(path)
+	if err2 != nil {
+		return false, err2
+	}
+	err = yaml.Unmarshal(bytes, target)
+	return true, err
+}
+
+func NewPreferences() Preferences {
+	preferences := loadDefaultPreferences()
+	exists, err := ReadCustomConfigYml("preferences.yml", &preferences)
+	if exists {
+		preferences.YmlError = err
+	}
+	return preferences
+}
+
+func (p Preferences) WindowSize() (unit.Dp, unit.Dp) {
+	return unit.Dp(p.Window.Width), unit.Dp(p.Window.Height)
+}
diff --git a/tracker/gioui/preferences.yml b/tracker/gioui/preferences.yml
new file mode 100644
index 0000000..bdd80c0
--- /dev/null
+++ b/tracker/gioui/preferences.yml
@@ -0,0 +1,4 @@
+window:
+  width: 800
+  height: 600
+  maximized: false
diff --git a/tracker/gioui/tracker.go b/tracker/gioui/tracker.go
index f104924..de8b430 100644
--- a/tracker/gioui/tracker.go
+++ b/tracker/gioui/tracker.go
@@ -18,7 +18,6 @@ import (
 	"gioui.org/op/clip"
 	"gioui.org/op/paint"
 	"gioui.org/text"
-	"gioui.org/unit"
 	"gioui.org/widget/material"
 	"gioui.org/x/explorer"
 	"github.com/vsariola/sointu/tracker"
@@ -51,8 +50,9 @@ type (
 
 		filePathString tracker.String
 
-		quitWG   sync.WaitGroup
-		execChan chan func()
+		quitWG      sync.WaitGroup
+		execChan    chan func()
+		preferences Preferences
 
 		*tracker.Model
 	}
@@ -89,9 +89,16 @@ func NewTracker(model *tracker.Model) *Tracker {
 		Model: model,
 
 		filePathString: model.FilePath().String(),
+		preferences:    NewPreferences(),
 	}
 	t.Theme.Shaper = text.NewShaper(text.WithCollection(fontCollection))
 	t.PopupAlert = NewPopupAlert(model.Alerts(), t.Theme.Shaper)
+	if t.preferences.YmlError != nil {
+		model.Alerts().Add(
+			fmt.Sprintf("Preferences YML Error: %s", t.preferences.YmlError),
+			tracker.Warning,
+		)
+	}
 	t.Theme.Palette.Fg = primaryColor
 	t.Theme.Palette.ContrastFg = black
 	t.TrackEditor.scrollTable.Focus()
@@ -101,9 +108,7 @@ func NewTracker(model *tracker.Model) *Tracker {
 
 func (t *Tracker) Main() {
 	titleFooter := ""
-	w := new(app.Window)
-	w.Option(app.Title("Sointu Tracker"))
-	w.Option(app.Size(unit.Dp(800), unit.Dp(600)))
+	w := t.newWindow()
 	t.InstrumentEditor.Focus()
 	recoveryTicker := time.NewTicker(time.Second * 30)
 	t.Explorer = explorer.NewExplorer(w)
@@ -127,9 +132,7 @@ func (t *Tracker) Main() {
 				}
 				if !t.Quitted() {
 					// TODO: uh oh, there's no way of canceling the destroyevent in gioui? so we create a new window just to show the dialog
-					w = new(app.Window)
-					w.Option(app.Title("Sointu Tracker"))
-					w.Option(app.Size(unit.Dp(800), unit.Dp(600)))
+					w = t.newWindow()
 					t.Explorer = explorer.NewExplorer(w)
 					go eventLoop(w, events, acks)
 				}
@@ -165,6 +168,16 @@ func (t *Tracker) Main() {
 	t.quitWG.Done()
 }
 
+func (t *Tracker) newWindow() *app.Window {
+	w := new(app.Window)
+	w.Option(app.Title("Sointu Tracker"))
+	w.Option(app.Size(t.preferences.WindowSize()))
+	if t.preferences.Window.Maximized {
+		w.Option(app.Fullscreen.Option())
+	}
+	return w
+}
+
 func eventLoop(w *app.Window, events chan<- event.Event, acks <-chan struct{}) {
 	// Iterate window events, sending each to the old event loop and waiting for
 	// a signal that processing is complete before iterating again.