Bleed is a printing term that refers to content extending past the trim line to the edge of the page. When books are printed, pages are cut to their final size. If an image or background is meant to reach the edge, it must extend beyond the trim — typically by 0.125" (3.175mm) — to prevent white edges after cutting.

Most text-only books do not need bleed. If your book is primarily paragraphs with standard margins (common for fiction and most nonfiction), you should use no-bleed. This keeps formatting simpler and avoids unnecessary printing costs.

You need bleed if any design element touches the edge of the page. This includes:

• Full-page images or photographs
• Illustrations that span the page
• Background colors or textures
• Decorative borders or design elements that reach the edge

This is common in children’s books, cookbooks, art books, photography books, and heavily designed nonfiction.

Bleed changes your file size requirements. Your PDF must be larger than your trim size to include the bleed area. For example, a 6"×9" book with bleed should be submitted as 6.25"×9.25". The extra space is trimmed off during production.

Bleed also affects margins and layout. When bleed is enabled, part of the page is reserved for trimming, so your text and important content must stay inside a safe zone. Both KDP and IngramSpark provide templates to guide this.

There is a small cost impact. Books printed with bleed typically cost slightly more per page. While the increase is small, it adds up across an entire book.

A simple rule: If any visual element reaches the edge of the page, use bleed. If all content stays within margins, use no-bleed.

Sources:

• KDP Help: Bleed Settings
• IngramSpark File Creation Guide
• Adobe: Understanding Bleed in Print Design