Amazon KDP Interior Margins: Everything You Need to Know!

Have you ever wondered about the importance of margins for your self-published book on Amazon KDP? Well, wonder no more!

Margins play a critical role in the aesthetics, readability, and even printability of your book. Understanding KDP’s margin requirements and best practices will ensure your book looks polished and professional.

In this blog post, I will quickly explain Amazon KDP Margins for you. Additionally, you will learn about margins for most popular trim sizes.

So, keep reading…

Understanding the Different Interior Margins

amazon kdp interior margins for beginners

Below some of the key elements you need to keep in mind to truly understand KDP interior margins.


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Inside Margin (Gutter)

This refers to the space between the text or content area and the binding edge of the book. In a double-page spread (two facing pages), the gutter appears on the inside of each page.

This margin increases with higher page counts to accommodate the thickness of the book’s spine.


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Outside Margin

This is the space between the text or content area and the edge of the page on the left (for right-facing pages) and the right (for left-facing pages).

Top Margin

This is the space between the text or content area and the top edge of the page.

Bottom Margin

This is the space between the text or content area and the bottom edge of the page.

KDP Margin Requirements and Recommendations

KDP margins serve two key purposes:

  1. Preventing Text Cut-Off: They ensure your book’s content stays safely within the printable area, avoiding any unwanted surprises during the printing process.
  2. Spine Accommodation: The inside margin, also called the gutter, increases with higher page counts. This is because thicker books require more space for the spine to allow for proper binding and comfortable reading when the book is open.

Here’s a breakdown of KDP’s minimum margin requirements based on page count and bleed options:

Page CountInside (Gutter) MarginOutside Margin (No Bleed)Outside Margin (With Bleed)
24 to 150 pages0.375 in (9.6 mm)At least 0.25 in (6.4 mm)At least 0.375 in (9.6 mm)
151 to 300 pages0.5 in (12.7 mm)At least 0.25 in (6.4 mm)At least 0.375 in (9.6 mm)
301 to 500 pages0.625 in (15.9 mm)At least 0.25 in (6.4 mm)At least 0.375 in (9.6 mm)
501 to 700 pages0.75 in (19.1 mm)At least 0.25 in (6.4 mm)At least 0.375 in (9.6 mm)
701 to 828 pages0.875 in (22.3 mm)At least 0.25 in (6.4 mm)At least 0.375 in (9.6 mm)

Important points to remember:

  • These are minimums. You can always opt for wider margins for improved readability or aesthetic purposes.
  • Top, bottom, and outside margins can differ. You can have wider top and bottom margins for a more traditional look while keeping the outside margin at the minimum.
  • Double-check your software! Some programs might have separate fields for “gutter” and “inside margin.” Make sure both have the same value.

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What are Trim Size, Bleed, and Margins?

Below I will briefly explain three most important things that you need to know while creating book interiors for Amazon KDP.

Trim size

Trim Size refers to the final dimensions of your physical book after it’s been printed and cut. The most popular trim size for paperbacks in the US is 6 x 9 inches, but you have a wide range of options to choose from. Keep in mind that some sizes may affect your printing costs.


Bleed is printing that extends to the edge of the page. If you want any elements of your book design (like images or backgrounds) to bleed to the edge, you’ll need to set your page size larger than your trim size to accommodate the bleed.


These are the spaces between the edge of the page and your book’s text or other content. Margins play a crucial role in the readability and overall aesthetics of your book.

Choosing the Right Margins for Your Book

There’s no one-size-fits-all answer when it comes to choosing margins. The ideal margin size will depend on several factors, including:

  • Book genre: Different genres may have different conventions for margins. For example, fiction books often have wider margins than textbooks.
  • Font size: If you’re using a smaller font size, you may want to use slightly wider margins to improve readability.
  • Content type: Books with a lot of images or graphics may benefit from slightly wider margins to avoid a cluttered look.
  • Personal preference: Ultimately, the choice of margins is up to you. Experiment with different margin sizes to see what looks best for your book.

Beyond the Basics: Designing with Margins

While KDP’s minimum margins ensure proper printing, you can use margins creatively to enhance your book’s design.

Wider margins can create a more luxurious feel, while narrower margins can give your book a modern look. Consider the overall aesthetic you’re aiming for and experiment with different margin combinations to find the perfect balance.


By understanding KDP’s margin requirements and exploring creative design options, you can ensure your self-published book looks polished, professional, and reader-friendly.

Don’t be afraid to experiment and find the margin style that perfectly complements your book’s content and genre.

Remember, margins are a powerful tool to enhance the overall aesthetics and user experience of your book. So, get creative and conquer those KDP margins!

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Subha Malik

Subha Malik is a Amazon KDP Author and Self Publisher. He loves to write about Low Content & Medium Content Book Publishing via Amazon KDP.

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