His best known works are The hye way to the Spytlell hous, a dialogue in verse between Copland and the porter of St Bartholomew's hospital, containing much information about the vagabonds who found their way there, including Thieves' Cant; and Jyl of Breyntford's Testament, dismissed in Athenae Oxonienses (ed. Bliss) as a poem devoid of wit or decency, and totally unworthy of further notice.
He translated from the French the romances of Kynge Appolyne of Thyre (W de Worde, 1510), The History of Helyas Knyght of the Swanne (W de Worde, 1512, 1522), and The Life of Ipomydon (Hue de Rotelande), not dated. Among his other works is The Complaynte of them that ben too late maryed, an undated tract printed by Wynkyn de Worde. William Copland, the printer, supposed to have been his brother, published three editions of Howleglas, perhaps by Robert, which in any case represent the earliest English version of Till Eulenspiegel. The Knyght of the Swanne was reprinted by W. Copland in 1560?, in Thoms's Early Prose Romances, vol. iii., and by the Grolier Club (1901); the Hye Way in WC Hazlitt's Remains of the Early Popular Poetry of England, vol. iv. (1866).
See further the Forewords to Dr FJ Furnivall's reprint of Jyl of Breyntford (for private circulation, 1871) and JP Collier, Bibliographical and Critical Account of the Rarest Books in the English Language, vol. 1. p. 153 (1865). For the books issued, from his press see Hand-Lists of English Printers (1501-1556), printed for the Bibliographical Society in 1896.