diff --git a/format.c b/format.c
index afcf7535..ec55fc91 100644
--- a/format.c
+++ b/format.c
@@ -1947,6 +1947,18 @@ format_cb_origin_flag(struct format_tree *ft)
 	return (NULL);
 }
 
+/* Callback for synchronized_output_flag. */
+static void *
+format_cb_synchronized_output_flag(struct format_tree *ft)
+{
+	if (ft->wp != NULL) {
+		if (ft->wp->base.mode & MODE_SYNC)
+			return (xstrdup("1"));
+		return (xstrdup("0"));
+	}
+	return (NULL);
+}
+
 /* Callback for pane_active. */
 static void *
 format_cb_pane_active(struct format_tree *ft)
@@ -3439,6 +3451,9 @@ static const struct format_table_entry format_table[] = {
 	{ "start_time", FORMAT_TABLE_TIME,
 	  format_cb_start_time
 	},
+	{ "synchronized_output_flag", FORMAT_TABLE_STRING,
+	  format_cb_synchronized_output_flag
+	},
 	{ "tree_mode_format", FORMAT_TABLE_STRING,
 	  format_cb_tree_mode_format
 	},
diff --git a/input.c b/input.c
index ce888887..b3f67b23 100644
--- a/input.c
+++ b/input.c
@@ -898,6 +898,8 @@ input_free(struct input_ctx *ictx)
 	evbuffer_free(ictx->since_ground);
 	event_del(&ictx->ground_timer);
 
+	screen_write_stop_sync(ictx->wp);
+
 	free(ictx);
 }
 
@@ -1897,6 +1899,11 @@ input_csi_dispatch_rm_private(struct input_ctx *ictx)
 		case 2031:
 			screen_write_mode_clear(sctx, MODE_THEME_UPDATES);
 			break;
+		case 2026:	/* synchronized output */
+			screen_write_stop_sync(ictx->wp);
+			if (ictx->wp != NULL)
+				ictx->wp->flags |= PANE_REDRAW;
+			break;
 		default:
 			log_debug("%s: unknown '%c'", __func__, ictx->ch);
 			break;
@@ -1995,6 +2002,9 @@ input_csi_dispatch_sm_private(struct input_ctx *ictx)
 		case 2031:
 			screen_write_mode_set(sctx, MODE_THEME_UPDATES);
 			break;
+		case 2026:	/* synchronized output */
+			screen_write_start_sync(ictx->wp);
+			break;
 		default:
 			log_debug("%s: unknown '%c'", __func__, ictx->ch);
 			break;
diff --git a/screen-redraw.c b/screen-redraw.c
index 0dda2fea..84ab17a6 100644
--- a/screen-redraw.c
+++ b/screen-redraw.c
@@ -898,6 +898,9 @@ screen_redraw_draw_pane(struct screen_redraw_ctx *ctx, struct window_pane *wp)
 	struct grid_cell	 defaults;
 	u_int			 i, j, top, x, y, width;
 
+	if (wp->base.mode & MODE_SYNC)
+		screen_write_stop_sync(wp);
+
 	log_debug("%s: %s @%u %%%u", __func__, c->name, w->id, wp->id);
 
 	if (wp->xoff + wp->sx <= ctx->ox || wp->xoff >= ctx->ox + ctx->sx)
diff --git a/screen-write.c b/screen-write.c
index 39c15b39..86eb45c2 100644
--- a/screen-write.c
+++ b/screen-write.c
@@ -894,6 +894,52 @@ screen_write_mode_clear(struct screen_write_ctx *ctx, int mode)
 		log_debug("%s: %s", __func__, screen_mode_to_string(mode));
 }
 
+/* Sync timeout callback. */
+static void
+screen_write_sync_callback(__unused int fd, __unused short events, void *arg)
+{
+	struct window_pane	*wp = arg;
+
+	log_debug("%s: %%%u sync timer expired", __func__, wp->id);
+	evtimer_del(&wp->sync_timer);
+
+	if (wp->base.mode & MODE_SYNC) {
+		wp->base.mode &= ~MODE_SYNC;
+		wp->flags |= PANE_REDRAW;
+	}
+}
+
+/* Start sync mode. */
+void
+screen_write_start_sync(struct window_pane *wp)
+{
+	struct timeval	tv = { .tv_sec = 1, .tv_usec = 0 };
+
+	if (wp == NULL)
+		return;
+
+	wp->base.mode |= MODE_SYNC;
+	if (!event_initialized(&wp->sync_timer))
+		evtimer_set(&wp->sync_timer, screen_write_sync_callback, wp);
+	evtimer_add(&wp->sync_timer, &tv);
+
+	log_debug("%s: %%%u started sync mode", __func__, wp->id);
+}
+
+/* Stop sync mode. */
+void
+screen_write_stop_sync(struct window_pane *wp)
+{
+	if (wp == NULL)
+		return;
+
+	if (event_initialized(&wp->sync_timer))
+		evtimer_del(&wp->sync_timer);
+	wp->base.mode &= ~MODE_SYNC;
+
+	log_debug("%s: %%%u stopped sync mode", __func__, wp->id);
+}
+
 /* Cursor up by ny. */
 void
 screen_write_cursorup(struct screen_write_ctx *ctx, u_int ny)
@@ -1692,6 +1738,9 @@ screen_write_collect_flush(struct screen_write_ctx *ctx, int scroll_only,
 	u_int				 y, cx, cy, last, items = 0;
 	struct tty_ctx			 ttyctx;
 
+	if (s->mode & MODE_SYNC)
+		return;
+
 	if (ctx->scrolled != 0) {
 		log_debug("%s: scrolled %u (region %u-%u)", __func__,
 		    ctx->scrolled, s->rupper, s->rlower);
@@ -1985,7 +2034,7 @@ screen_write_cell(struct screen_write_ctx *ctx, const struct grid_cell *gc)
 	}
 
 	/* Write to the screen. */
-	if (!skip) {
+	if (!skip && !(s->mode & MODE_SYNC)) {
 		if (selected) {
 			screen_select_cell(s, &tmp_gc, gc);
 			ttyctx.cell = &tmp_gc;
diff --git a/tmux.1 b/tmux.1
index f032a8de..6e5b70f7 100644
--- a/tmux.1
+++ b/tmux.1
@@ -6262,6 +6262,7 @@ The following variables are available, where appropriate:
 .It Li "socket_path" Ta "" Ta "Server socket path"
 .It Li "sixel_support" Ta "" Ta "1 if server has support for SIXEL"
 .It Li "start_time" Ta "" Ta "Server start time"
+.It Li "synchronized_output_flag" Ta "" Ta "1 if pane has synchronized output enabled"
 .It Li "uid" Ta "" Ta "Server UID"
 .It Li "user" Ta "" Ta "Server user"
 .It Li "version" Ta "" Ta "Server version"
diff --git a/tmux.h b/tmux.h
index 9cd11609..180208e3 100644
--- a/tmux.h
+++ b/tmux.h
@@ -643,6 +643,7 @@ enum tty_code_code {
 #define MODE_CURSOR_BLINKING_SET 0x20000
 #define MODE_KEYS_EXTENDED_2 0x40000
 #define MODE_THEME_UPDATES 0x80000
+#define MODE_SYNC 0x100000
 
 #define ALL_MODES 0xffffff
 #define ALL_MOUSE_MODES (MODE_MOUSE_STANDARD|MODE_MOUSE_BUTTON|MODE_MOUSE_ALL)
@@ -1190,6 +1191,7 @@ struct window_pane {
 
 	struct window_pane_resizes resize_queue;
 	struct event	 resize_timer;
+	struct event	 sync_timer;
 
 	struct input_ctx *ictx;
 
@@ -3099,6 +3101,8 @@ void	 screen_write_preview(struct screen_write_ctx *, struct screen *, u_int,
 void	 screen_write_backspace(struct screen_write_ctx *);
 void	 screen_write_mode_set(struct screen_write_ctx *, int);
 void	 screen_write_mode_clear(struct screen_write_ctx *, int);
+void	 screen_write_start_sync(struct window_pane *);
+void	 screen_write_stop_sync(struct window_pane *);
 void	 screen_write_cursorup(struct screen_write_ctx *, u_int);
 void	 screen_write_cursordown(struct screen_write_ctx *, u_int);
 void	 screen_write_cursorright(struct screen_write_ctx *, u_int);
diff --git a/window.c b/window.c
index 80bc57c2..24bc5936 100644
--- a/window.c
+++ b/window.c
@@ -990,6 +990,8 @@ window_pane_destroy(struct window_pane *wp)
 
 	if (event_initialized(&wp->resize_timer))
 		event_del(&wp->resize_timer);
+	if (event_initialized(&wp->sync_timer))
+		event_del(&wp->sync_timer);
 	TAILQ_FOREACH_SAFE(r, &wp->resize_queue, entry, r1) {
 		TAILQ_REMOVE(&wp->resize_queue, r, entry);
 		free(r);
@@ -1069,6 +1071,8 @@ window_pane_resize(struct window_pane *wp, u_int sx, u_int sy)
 	if (sx == wp->sx && sy == wp->sy)
 		return;
 
+	screen_write_stop_sync(wp);
+
 	r = xmalloc(sizeof *r);
 	r->sx = sx;
 	r->sy = sy;