The book's size and the spine
The sheets match the PDF page size; you decide the spine width.
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- In the cover editor, on the spine sheet, drag its edges or type its width in Spine width.
Beside it you see, for reference, what it would measure with the book's pages. If it's too thin for text, the editor tells you.
The sheets' size
The front, back and half-title measure the same as your book's PDF page. If you change the page size, they follow without shifting. You can also change it from the editor under Paper.
Exaratio 0.9 · 第 1 版 · 2026年10月28日