In the book trade, a tipped-in page or, if it is an illustration, tipped-in plate, is a page that is printed separately from the main text of the book, but attached to the book.
A tipped-in page may be glued onto a regular page, or even bound along with the other pages. It is often printed on a different kind of paper, using a different printing process, and of a different format than a regular page. Some authors include loose pages inserted into a book as tipped-in, but in this case, it is usually called an insert instead.
Coffee table art books featuring high quality tipped-in color plates were popular starting in the late 1940s and into the 1980s. Examples include several large series of books on painting published by Editions d'Art Albert Skira, Geneva: e.g. Painting, Color, History (23 volumes 1949–1972); The Great Centuries of Painting (14 volumes 1950–1959); The Taste of Our Time (57 volumes 1953–1972) with "hand-tipped colorplates" Harry N. Abrams, Inc., Publishers, New York also published many fine art books during this period with tipped-in plates, examples include the 56 volume series The Library of Great Painters published 1959–1985 with each book having ca. 48 "tipped-on colorplates" or "hand-tipped plates in full color".
Tipped-in pages are generally glued to a bound page on its inner side and may be called "paste ins".