Pomacanthus sexstriatus can reach a total body length of about 46 cm (18 in) in the ocean.
These  angelfishes have 13-14 dorsal spines, 18-23 dorsal soft rays, 3 anal spines and 18-19 anal soft rays.
They have an easily recognisable very dark brown head.
Body may have a yellow, silver white or cream coloration with black or brown vertical stripes (usually six on each side, hence the common name sixbar and the species name sexstriatus).
There is one white vertical stripe on each side of its head.
Fluorescent blue spots speckle the entire body, fins and tail.
On the top and bottom fin and tail are present fluorescent blue lines.

Like many juvenile angelfish, also the juveniles of this species have a pattern of white and light blue horizontal stripes on a dark blue background.
The adult coloring is formed when they reach a length of 8–15 cm (3.1–5.9 in).
Pomacanthus sexstriatus can reach a total body length of about 46 cm (18 in) in the ocean. These  angelfishes have 13-14 dorsal spines, 18-23 dorsal soft rays, 3 anal spines and 18-19 anal soft rays. They have an easily recognisable very dark brown head. Body may have a yellow, silver white or cream coloration with black or brown vertical stripes (usually six on each side, hence the common name sixbar and the species name sexstriatus). There is one white vertical stripe on each side of its head. Fluorescent blue spots speckle the entire body, fins and tail. On the top and bottom fin and tail are present fluorescent blue lines.
Like many juvenile angelfish, also the juveniles of this species have a pattern of white and light blue horizontal stripes on a dark blue background. The adult coloring is formed when they reach a length of 8–15 cm (3.1–5.9 in).
Sixbar angelfish