diff --git a/ansi/winop.go b/ansi/winop.go
new file mode 100644
index 00000000..020ec933
--- /dev/null
+++ b/ansi/winop.go
@@ -0,0 +1,47 @@
+package ansi
+
+import (
+	"strconv"
+	"strings"
+)
+
+const (
+	// ResizeWindowWinOp is a window operation that resizes the terminal
+	// window.
+	ResizeWindowWinOp = 4
+
+	// ReportWindowSizeWinOp is a window operation that reports the size of the
+	// terminal window in pixels.
+	ReportWindowSizeWinOp = 14
+)
+
+// WindowOp (XTWINOPS) is a sequence that manipulates the terminal window.
+//
+//	CSI Ps ; Ps ; Ps t
+//
+// Ps is a semicolon-separated list of parameters.
+// See https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h4-Functions-using-CSI-_-ordered-by-the-final-character-lparen-s-rparen:CSI-Ps;Ps;Ps-t.1EB0
+func WindowOp(p int, ps ...int) string {
+	if p <= 0 {
+		return ""
+	}
+
+	if len(ps) == 0 {
+		return "\x1b[" + strconv.Itoa(p) + "t"
+	}
+
+	params := make([]string, 0, len(ps)+1)
+	params = append(params, strconv.Itoa(p))
+	for _, p := range ps {
+		if p >= 0 {
+			params = append(params, strconv.Itoa(p))
+		}
+	}
+
+	return "\x1b[" + strings.Join(params, ";") + "t"
+}
+
+// XTWINOPS is an alias for [WindowOp].
+func XTWINOPS(p int, ps ...int) string {
+	return WindowOp(p, ps...)
+}