KDP Typography Guide: Fonts, Sizes, Spacing, and eBook Readability

Typography is part of book production, not decoration added at the end. In print, it determines how dense the page feels, how easily the eye tracks from one line to the next, and whether a long reading session becomes tiring. In an eBook, typography has to remain usable after the reader changes font size, device, orientation, or accessibility settings.

The practical rule is to make decisions for the format you are building. Start with a clean, consistently styled manuscript using the workflow in our KDP manuscript preparation checklist, then apply print and eBook typography separately instead of forcing one layout to do both jobs.

Print and eBook Typography Solve Different Problems

A print page is fixed. You control the trim size, line length, typeface, font size, leading, paragraph indents, margins, running heads, and page breaks. That control is useful, but it also means every decision becomes part of the manufactured object. A beautiful font at the wrong size or a comfortable size in a line that is too long can still create a tiring page.

A reflowable Kindle book works differently. Readers can change text size and, on many devices, the reading font. The layout therefore needs semantic structure and resilient styles rather than tightly controlled page geometry. Treat the eBook as responsive reading content and the print edition as page design. Our KDP eBook formatting guide and paperback formatting guide cover those format-specific constraints in more detail.

Choosing a Body Typeface for Print

For long-form adult reading, a well-drawn serif typeface is a dependable starting point because the letterforms are designed for sustained text. Garamond, Minion, Baskerville, Caslon, and similar book faces are common examples. Sans serif can work well for some nonfiction, workbooks, children’s books, and highly contemporary designs, but the choice should serve the audience and the page rather than follow a trend.

Licensing matters. A font that is installed on your computer is not automatically licensed for commercial print or eBook embedding. Check the license before publishing, especially if you bought a font through a design marketplace. If you are using a standard system or open-source family, still confirm that the version you have permits the way you intend to use it.

Body Text Size, Leading, and Line Length

There is no single KDP-approved body-text size for ordinary trade books. KDP’s print submission guidance sets a minimum font size of 7 points, but that is a technical floor rather than a target for comfortable reading. Many adult trade books land somewhere around 10–12 points, depending on the typeface, trim size, audience, and line length. A 10-point face with a large x-height can look bigger than another face at 11 points.

Leading, the vertical space from one baseline to the next, should give lines enough separation to track cleanly without making the page look disconnected. Start by testing roughly 1.2–1.35 times the body size, then judge the actual page. Long lines generally need more leading; narrow measures can tolerate slightly tighter spacing. Avoid using “single spacing” as if it were a publishing specification because word processors interpret that setting in ways that vary by font.

Line length matters as much as font size. If a 6 × 9 inch page has very narrow margins, a small font, and 85 characters on a line, the eye has a long return journey at every line break. If the line is too short, reading becomes choppy. Adjust margins, font size, and leading together rather than trying to optimize each in isolation.

Headings, Chapter Openers, and Hierarchy

Your heading system should make the structure obvious without turning the interior into a poster. Chapter titles need a consistent relationship to body text. Section headings should be visibly subordinate to chapter titles, and subheads should remain subordinate to those. Use styles rather than manual bolding and resizing so the hierarchy is both visually consistent and structurally meaningful.

Chapter openers are a useful place for restrained character: a display face, small caps, an ornament, or a drop cap can work when it matches the genre. Keep the decorative layer separate from the navigation layer. In the source manuscript, chapter titles should still use a true heading style so your eBook navigation and table of contents can be generated reliably.

Paragraph Indents, Spacing, and Scene Openers

Most continuous trade prose uses either first-line indents or paragraph spacing, not both. Fiction commonly uses a modest first-line indent with no extra space between ordinary paragraphs. Many practical nonfiction books use more vertical separation, especially when paragraphs are short and broken up by headings or lists. The goal is a consistent reading rhythm, not a universal rule.

The first paragraph after a chapter heading, section heading, or scene break is often set flush left rather than indented. This small convention helps the reader see that a new unit has begun. Apply it through a dedicated first-paragraph style so the treatment remains consistent when the manuscript changes.

eBook Typography: Use Relative, Flexible Styling

In a reflowable eBook, avoid hard-coding a print layout. Use paragraph and heading styles, relative sizing, and clean structure so readers can change font size without breaking the book. Amazon’s Kindle publishing guidance is built around this principle: the reader controls the reading environment, while the publisher supplies sensible defaults and a clear hierarchy.

Do not convert ordinary body text into images to preserve a particular font. That harms accessibility, search, selection, and resizing. Use images only when the information genuinely needs to be graphical, and supply appropriate alternative text where required. Test the eBook in Kindle Previewer at several text sizes rather than approving it only at the default view.

Proof Typography in the Format Readers Will Use

Before final QA, build a small typography test sheet containing ordinary body text, dialogue, a long paragraph, a short paragraph, italics, a block quote, a chapter heading, a subheading, a list, and any special characters used in the manuscript. Test that page before formatting the whole book. It exposes weak font pairings, cramped line spacing, and hierarchy problems while they are still cheap to change.

Typography QA should happen after conversion, not only in the source file. For print, inspect the PDF in Print Previewer and order a KDP proof copy when the physical reading experience matters. Look for weak contrast, cramped gutters, awkward widows and orphans, broken running heads, overlarge chapter titles, and font substitutions.

Check edge cases deliberately. Look at the shortest chapter title and the longest one, a page dominated by dialogue, a page with a long quotation, and any section where a heading lands near the bottom of a page. In print, watch for widows, orphans, isolated subheads, and pages that become unusually sparse because of forced breaks. In an eBook, watch for headings that separate from the paragraph they introduce or decorative elements that become oversized when the reader increases text size.

For eBooks, use Kindle Previewer to check phone, tablet, and e-reader views. Increase the font size aggressively and make sure chapter breaks, headings, quotations, lists, and scene breaks still make sense. If the typography survives those stress tests, it is much more likely to survive the real variety of reader settings.

Frequently Asked Questions

What to Do Next

Lock the manuscript structure first, then set typography for the format you are producing. Once the print interior is stable, validate the PDF and inspect a physical proof before treating the design as finished.