diff --git a/docs/labwc-theme.5.scd b/docs/labwc-theme.5.scd
index dabfa6a6..614934d7 100644
--- a/docs/labwc-theme.5.scd
+++ b/docs/labwc-theme.5.scd
@@ -164,6 +164,8 @@ elements are not listed here, but are supported.
 
 *osd.window-switcher.width*
 	Width of window switcher in pixels. Default is 600.
+	Width can also be percent of the width of the monitor.
+	% is mandatory as last character in this case, max 100%
 
 *osd.window-switcher.padding*
 	Padding of window switcher in pixels. This is the space between the
diff --git a/docs/themerc b/docs/themerc
index 67d7d5df..aa1e322c 100644
--- a/docs/themerc
+++ b/docs/themerc
@@ -60,7 +60,10 @@ osd.border.color: #000000
 osd.border.width: 1
 osd.label.text.color: #000000
 
+# width can be set as percent (of screen width)
+# example 50% or 75% instead of 600, max 100%
 osd.window-switcher.width: 600
+
 osd.window-switcher.padding: 4
 osd.window-switcher.item.padding.x: 10
 osd.window-switcher.item.padding.y: 1
diff --git a/include/theme.h b/include/theme.h
index b4c0e738..5b584d59 100644
--- a/include/theme.h
+++ b/include/theme.h
@@ -75,6 +75,7 @@ struct theme {
 	int osd_window_switcher_item_padding_x;
 	int osd_window_switcher_item_padding_y;
 	int osd_window_switcher_item_active_border_width;
+	bool osd_window_switcher_width_is_percent;
 
 	int osd_workspace_switcher_boxes_width;
 	int osd_workspace_switcher_boxes_height;
diff --git a/src/osd.c b/src/osd.c
index d6d6be56..b41b1bf1 100644
--- a/src/osd.c
+++ b/src/osd.c
@@ -321,7 +321,7 @@ render_osd(struct server *server, cairo_t *cairo, int w, int h,
 	if (show_workspace) {
 		/* Center workspace indicator on the x axis */
 		int x = font_width(&rc.font_osd, workspace_name);
-		x = (theme->osd_window_switcher_width - x) / 2;
+		x = (w - x) / 2;
 		cairo_move_to(cairo, x, y + theme->osd_window_switcher_item_active_border_width);
 		PangoWeight weight = pango_font_description_get_weight(desc);
 		pango_font_description_set_weight(desc, PANGO_WEIGHT_BOLD);
@@ -432,7 +432,7 @@ render_osd(struct server *server, cairo_t *cairo, int w, int h,
 			struct wlr_fbox fbox = {
 				.x = theme->osd_border_width + theme->osd_window_switcher_padding,
 				.y = y,
-				.width = theme->osd_window_switcher_width
+				.width = w
 					- 2 * theme->osd_border_width
 					- 2 * theme->osd_window_switcher_padding,
 				.height = theme->osd_window_switcher_item_height,
@@ -460,6 +460,10 @@ display_osd(struct output *output, struct wl_array *views)
 
 	float scale = output->wlr_output->scale;
 	int w = theme->osd_window_switcher_width;
+	if (theme->osd_window_switcher_width_is_percent) {
+		w = output->wlr_output->width / output->wlr_output->scale
+			* theme->osd_window_switcher_width / 100;
+	}
 	int h = wl_array_len(views) * rc.theme->osd_window_switcher_item_height
 		+ 2 * rc.theme->osd_border_width
 		+ 2 * rc.theme->osd_window_switcher_padding;
diff --git a/src/theme.c b/src/theme.c
index 983d7bc4..d5b0d3b5 100644
--- a/src/theme.c
+++ b/src/theme.c
@@ -494,6 +494,7 @@ theme_builtin(struct theme *theme)
 	parse_hexstr("#888888", theme->menu_separator_color);
 
 	theme->osd_window_switcher_width = 600;
+	theme->osd_window_switcher_width_is_percent = false;
 	theme->osd_window_switcher_padding = 4;
 	theme->osd_window_switcher_item_padding_x = 10;
 	theme->osd_window_switcher_item_padding_y = 1;
@@ -674,7 +675,12 @@ entry(struct theme *theme, const char *key, const char *value)
 		parse_hexstr(value, theme->osd_border_color);
 	}
 	if (match_glob(key, "osd.window-switcher.width")) {
-		theme->osd_window_switcher_width = atoi(value);
+		if (strrchr(value, '%')) {
+			theme->osd_window_switcher_width_is_percent = true;
+		} else {
+			theme->osd_window_switcher_width_is_percent = false;
+		}
+		theme->osd_window_switcher_width = MAX(atoi(value), 0);
 	}
 	if (match_glob(key, "osd.window-switcher.padding")) {
 		theme->osd_window_switcher_padding = atoi(value);
@@ -1011,6 +1017,10 @@ post_processing(struct theme *theme)
 	if (theme->osd_workspace_switcher_boxes_height == 0) {
 		theme->osd_workspace_switcher_boxes_width = 0;
 	}
+	if (theme->osd_window_switcher_width_is_percent) {
+		theme->osd_window_switcher_width =
+			MIN(theme->osd_window_switcher_width, 100);
+	}
 }
 
 void