diff --git a/input.go b/input.go
index 0ee88ce..e93a41b 100644
--- a/input.go
+++ b/input.go
@@ -194,6 +194,15 @@ func (t *Input) SetFont(fnt *text.GoTextFaceSource, size int) {
 	t.field.SetFont(fnt, size, fontMutex)
 }
 
+// SetAutoResize sets whether the font is automatically scaled down when it is
+// too large to fit the entire text buffer on one line.
+func (t *Input) SetAutoResize(resize bool) {
+	t.Lock()
+	defer t.Unlock()
+
+	t.field.SetAutoResize(resize)
+}
+
 // Padding returns the amount of padding around the text within the field.
 func (i *Input) Padding() int {
 	i.Lock()
diff --git a/messeji/inputfield.go b/messeji/inputfield.go
index d7f5ccc..5bd95b2 100644
--- a/messeji/inputfield.go
+++ b/messeji/inputfield.go
@@ -85,12 +85,18 @@ func (f *InputField) HandleKeyboardEvent(key ebiten.Key, r rune) (handled bool,
 
 	// Handle rune event.
 	if r > 0 {
-		f.handleRunes([]rune{r})
+		ok := f.handleRunes([]rune{r})
+		if ok {
+			f.resizeFont()
+		}
 		return true, nil
 	}
 
 	// Handle key event.
-	f.handleKeys([]ebiten.Key{key})
+	ok := f.handleKeys([]ebiten.Key{key})
+	if ok {
+		f.resizeFont()
+	}
 	return true, nil
 }
 
@@ -207,6 +213,7 @@ func (f *InputField) Update() error {
 	f.rawKeyBuffer = f.rawKeyBuffer[:0]
 
 	if redraw {
+		f.resizeFont()
 		f.bufferModified()
 	}
 
diff --git a/messeji/textfield.go b/messeji/textfield.go
index dd598de..ae0fbff 100644
--- a/messeji/textfield.go
+++ b/messeji/textfield.go
@@ -267,6 +267,7 @@ func (f *TextField) SetRect(r image.Rectangle) {
 
 func (f *TextField) text() string {
 	f.processIncoming()
+	f.resizeFont()
 	return string(bytes.Join(f.buffer, []byte("\n")))
 }
 
@@ -554,6 +555,7 @@ func (f *TextField) SetScrollBorderSize(size int) {
 
 	f.scrollBorderSize = size
 	f.redraw = true
+	f.resizeFont()
 }
 
 // SetScrollBorderColor sets the color of the top, right, bottom and left border
@@ -582,6 +584,7 @@ func (f *TextField) SetScrollBarVisible(scrollVisible bool) {
 	f.needWrap = 0
 	f.wrapStart = 0
 	f.modified = true
+	f.resizeFont()
 }
 
 // SetAutoHideScrollBar sets whether the scroll bar is automatically hidden
@@ -598,6 +601,7 @@ func (f *TextField) SetAutoHideScrollBar(autoHide bool) {
 	f.needWrap = 0
 	f.wrapStart = 0
 	f.modified = true
+	f.resizeFont()
 }
 
 // WordWrap returns the current text wrap mode.
@@ -777,7 +781,7 @@ func (f *TextField) _handleMouseEvent(cursor image.Point, pressed bool, clicked
 				f.scrollDragOffset = f.offset
 			}
 			if f.scrollDragPoint.X != -1 {
-				delta := f.scrollDragPoint.Y - cursor.Y
+				delta := f.scrollDragPoint.Y - p.Y
 				f.offset = f.scrollDragOffset - delta
 			} else { // Handle dragging the scroll bar handle.
 				dragY := cursor.Y - f.r.Min.Y - f.scrollWidth/4
@@ -1256,6 +1260,7 @@ func (f *TextField) processIncoming() {
 
 func (f *TextField) bufferModified() {
 	f.processIncoming()
+	f.resizeFont()
 
 	f.drawImage()