Facial hair changes a face's apparent proportions more than almost any other grooming choice, because it sits directly on the jawline — the exact measurement that defines whether a face reads as rectangle in the first place. Also called oblong, this shape shares the square's consistent width from forehead to jaw but stretches significantly longer, often with a tall forehead and elongated cheeks. The jaw can be squared or slightly rounded, but the defining trait is verticality rather than angularity.
How It's Grown and Shaped
How it's grown and shaped: Chin and mustache hair grown and shaped, cheeks and jawline shaved clean. Elongates the chin area and draws the eye toward the face's center.
Why It Works
Why it works on a rectangle jaw: This face shape's jaw reads as "squared or gently rounded, similar in width to the forehead." A beard that is shorter or rounder chins that benefit from added vertical length directly addresses that starting point. Introduce visual width and interrupt the vertical line — horizontal volume at the sides, fringe or bangs that shorten the forehead, and frames or hairlines with a strong horizontal emphasis all work against excess length rather than adding to it.
Where to Be Careful
Where to be careful: Already-long or narrow chins, which the style would stretch further — if your jaw already leans that direction, ask your barber to reduce density slightly rather than following the standard shape exactly as described above.