Writing a book is an incredible journey, but once the words are on the page, one of the most strategic decisions of the publishing process arises: what is the ideal format for publication?
Choosing a book format goes far beyond aesthetics. It impacts production costs, distribution, and, most importantly, your audience's reading experience.
If you are unsure about which path to take, this straight-to-the-point guide will help you make the best decision.

1. Physical Book vs. Digital

Before thinking about dimensions, you need to define the formats in which your book will be available. They are not mutually exclusive and work very well together:

• Physical Book (Print): Offers the tactile experience that many readers still prefer. It is essential for direct sales, events, and book signings.

• Ebook (Digital): Ideal for those seeking low production costs and instant distribution. It works in ePUB formats (reflowable text that adjusts to the e-reader screen) and PDF (fixed layout, ideal for illustrated pages).

2. Choosing the Size (Physical Book Dimensions)

Page size (known as trim size) impacts reader comfort, portability, and the final page count.
The most common formats in the market are:

• 14 x 21 cm / 5.5 x 8.5 in (Industry Standard): The classic choice for novels, fiction, poetry, and biographies. It is lightweight, easy to carry, and very cost-effective for printing.

• 16 x 23 cm / 6 x 9 in (Corporate/Trade Format): Widely used for non-fiction, business, self-help, and personal development. Its larger dimensions convey authority and allow for a more spacious layout.

• 21 x 28 cm / 8.5 x 11 in or Square (Illustrated): Broad formats suitable for children's, photography, educational, or art books, ensuring images get the prominent display they need.

3. How to Decide the Best Format for Your Project

To make the right choice, consider these essential factors:

• Text length: Very long books are more comfortable in larger formats (such as 16 x 23 cm / 6 x 9 in) to avoid excessively thick spines.

• Presence of illustrations: Visual works require larger formats to prevent the layout from feeling cluttered.

• Sales goals: If the objective is wide distribution at more accessible prices, standard formats (like 14 x 21 cm / 5.5 x 8.5 in or Ebooks) are the best options.

Conclusion:

The ideal format is one that respects your work's genre and delivers the best experience to your reader. Run layout tests in your chosen format before sending it to the printer or publishing it digitally!