Galley proof

In printing and publishing, proofs are the preliminary versions of publications meant for review by authors, editors, and proofreaders, often with extra-wide margins. Galley proofs may be uncut and unbound, or in some cases electronically published. They are created for proofreading and copyediting purposes, but may be used for promotional and review purposes also.

Galley proofs are so named because in the days of hand-set letterpress printing, the printer would set the page into galleys—the metal trays into which type was laid and tightened into place—which would then be used to print limited copies for proofreading. The printer would then receive the edits, re-arrange the type, and print the final copy.

Some publishers use paper galley proofs as advance copies, providing them to reviewers, magazines, and libraries in advance of final publication; these print-on-demand (POD) pre-publication publicity proofs are normally bound, but may be lacking illustrations (or have them in black and white only). Proofs in electronic form are rarely offered for advance reading.