The strong-billed woodcreeper (Xiphocolaptes promeropirhynchus) is a species of bird in the Dendrocolaptinae subfamily. It is one of the largest woodcreepers and the largest furnariids, though the slender long-billed woodcreeper is longer and the great rufous woodcreeper is larger overall. There is some size variation across the range, with typical birds measuring 28–31 cm (11-12.5 in) long and weighing about 120 grams (4.2 oz). Large strong-billed woodcreepers can measure up to 35 cm (14 in) and weigh 169 grams (6 oz). The most distinctive feature of this typically marked striped, brownish bird (other than its size) is its massive, semi-decurved bill, which may be brown or blackish.