The Boeing 747-400D carried the largest standard passenger capacity in the 747 family, with seating for up to 568 passengers.
The 747-400D was a high-density domestic version built specifically for Japan’s busy internal routes. Unlike the long-range 747-400, it omitted winglets and was optimized for frequent flights rather than intercontinental range. Its dense two-class configuration allowed substantially more seats than typical international 747 layouts.
Japan Airlines and All Nippon Airways operated 747-400Ds on heavily traveled domestic services. These aircraft were recognizable as 747s but used a different interior and operating philosophy from the long-range versions commonly seen on international routes.
The 747-8 later became the newest and longest production passenger 747, but it did not surpass the 747-400D’s maximum standard seating figure. Maximum capacity also depends on airline configuration, so this answer refers to Boeing’s published high-density arrangement rather than every possible custom cabin.