Learning how to format a large print book means more than making the font bigger. Real large print follows published accessibility standards for type size, spacing, contrast and layout, and it needs a larger page, a new page count and honest labelling as its own edition. This guide gives you the exact settings to use, the trim sizes that work on KDP, and the checks to run before you publish.
How to Format a Large Print Book to Real Standards
Large print is a promise to a specific reader. Many of those readers have low vision and cannot comfortably read standard print at all. Others are older readers whose eyes tire quickly, and readers with dyslexia who benefit from clearer spacing. If you label a book as large print, readers will judge it against library large print collections, so a slightly enlarged normal edition will disappoint them.
The published standards are clear. The Royal National Institute of Blind People, known as RNIB, defines large print as 16 point or larger. The UK Association for Accessible Formats, known as UKAAF, sets 16 point as the minimum for large print and 18 point as the ideal. Those two bodies are the reference points libraries and specialist publishers use, so build your edition to meet them rather than inventing your own definition.
Treat the standard as applying to the whole book, not only the story text. Page numbers, chapter headings, captions, footnotes and contents entries should never fall below your chosen minimum. A reader who can read your chapters but cannot read your page numbers or your table of contents has not been given an accessible book. Headings can be larger than the body text, as in a standard edition, but nothing a reader needs should be smaller.
KDP itself does not run a separate large print approval programme. You publish the edition as a normal paperback with its own listing, and you are responsible for making the claim true. That is why following RNIB and UKAAF guidance matters: it is the honest, checkable basis for the words large print on your cover and in your title.
Choose a Typeface, Size and Spacing Readers Can Follow
Start with the typeface. UKAAF guidance calls for a legible sans serif typeface such as Arial. Clear sans serif faces such as Arial, Helvetica and Verdana are the safest choices because their letter shapes stay distinct and their lowercase forms are easy to tell apart. If you prefer a serif face for fiction, choose a clear, sturdy one with a large x height, and test it in print. Avoid decorative, thin and condensed faces entirely.
Set the body text at 18 point if your page count allows it, and never below 16 point. Remember that point size alone is a rough measure, because two faces at the same point size can look quite different in size. Compare your chosen face against Arial at the same size. If your face looks visibly smaller, increase the size until the lowercase letters match in height.
Spacing and styles that help or hurt
Give the text room to breathe. Use line spacing of at least 1.25, and consider 1.4 to 1.5 for nonfiction or for readers with very low vision. Add clear space between paragraphs instead of relying only on first line indents, because indents are easy to miss at large sizes. Keep word spacing and letter spacing at the normal settings for your typeface. Stretched or compressed spacing makes words harder to recognise.
Follow the style rules the standards set out. Avoid italics for anything longer than a word or two, and avoid underlining and long blocks of capital letters, because all three slow readers with low vision down. Use bold sparingly for headings and key terms. Keep the text black on white or on a soft cream page, with no text printed over images or tinted boxes. High contrast is not a design preference in large print. It is the point of the edition.
Align the text to the left and leave the right edge ragged. Do not justify large print text. Justified text creates uneven gaps between words that make it harder to track from the end of one line to the start of the next. Left aligned text keeps word spacing even and gives the eye a consistent starting point.
Pick a Trim Size That Gives Large Type Room
Bigger type needs a bigger page, or your book becomes awkwardly thick and your lines become too short. Short lines force the eye to jump constantly, which is tiring for the very readers you are serving. As a working rule, aim for a comfortable line length with enough words per line to keep a natural reading rhythm.
A 6 by 9 inch trim is the smallest size that works well for a large print edition, and it suits shorter books. A 7 by 10 inch trim gives noticeably more room per page and is a strong default for longer novels and most nonfiction. An 8 by 10 inch trim or an 8.5 by 11 inch trim suits workbooks and books with tables or illustrations that must stay large. Larger trims cost more to print per copy on KDP, so weigh reading comfort against price.
Whatever size you choose, set it before you format a single page, because trim size shapes margins, line length and page count all at once. If you are new to print layout, work through book formatting basics like trim sizes, margins and files first, so the vocabulary and the order of decisions are clear. Then format the large print file as a separate document from your standard edition, never as a quick resize of it.
Set Margins, Alignment and Pages for Easy Reading
Use generous margins. Large print readers often hold a book closer and benefit from more white space around the text block. Keep your outside, top and bottom margins comfortably above the minimum KDP allows, and give the inside margin, the gutter, extra room as your page count grows, because thick books curve more sharply into the spine. Text that disappears into the fold is a common failure in long large print books.
The general interior workflow is the same one you would use for any paperback. Our step by step guide to how to format a paperback interior for KDP step by step covers chapter starts, page numbers, embedded fonts and print ready PDF export in order. Follow that process, but apply the large print settings in this guide at every stage: size, spacing, alignment and contrast all change, even though the export steps do not.
Front matter, headings and page numbers
Reset your front matter at the new size rather than copying it across. Your contents page will have new page numbers, and your title page and copyright page must meet the same minimum size as the rest of the book. Keep headings short and clear, because a long heading at 20 point or more can wrap awkwardly and push the chapter opening down the page.
Start each chapter on a new page, as you would in a standard edition, and keep your page numbers in the same position and at the same size throughout. Some readers navigate by page number when a friend or a reading group recommends a passage, so numbers are part of the reading experience, not decoration. Check a printed proof with fresh eyes: can you find a chapter, follow a line and read a page number without effort?
Handle Page Count, Pricing and Labelling on KDP
Expect your page count to grow sharply. Moving from a standard 11 point setting to 18 point, with wider spacing and a larger trim, can easily double a book. Proofread the new pagination carefully, because widows, chapter breaks and contents entries will all land in new places. A longer book also costs more to print, so check the KDP printing cost at your final page count before you set a price.
Publish the large print version as its own edition. It needs its own ISBN, separate from the standard paperback, the hardcover and the ebook, because the format and page count are different. In KDP, set it up as a new paperback, link it to the other editions on your author page where Amazon offers that option, and keep the interior and cover files completely separate so an update to one edition never overwrites the other.
Label it honestly and clearly. Put the words Large Print in the edition information on the listing and state it on the cover in a way a buyer browsing thumbnails can see. Never market a book as large print if the body text is below 16 point. That mismatch brings returns and complaints, because the buyers are readers who genuinely cannot use a smaller setting.
Finish with a printed proof, read in normal room light at a normal chair distance for at least twenty minutes. If your eyes tire, your readers will tire faster. Adjust line spacing or size before you approve the proof.
How Folio Authors Helps With Large Print Editions
A second edition doubles your formatting work, so keeping both editions organised in one place helps. Folio Authors is publishing software for independent authors that brings assessment, editing, formatting, cover design and publishing into one dashboard, and you keep 100 percent of your rights and royalties. Before you rebuild your book at a new size, your first assessment is free and it includes a 500 word editing sample, with no card needed.
The Standard plan is $150 one time and unlocks all Folio tools, with publishing, audiobook and marketing tools charged separately. Publishing is priced per route, from Amazon KDP at $99 to 10 Platforms at $799 and Global Online at $1,299, and a free ISBN is included for each published edition or you can use your own. If you want a person to do the resize for you, custom formatting is $100.
Frequently Asked Questions
What font size counts as large print?
Large print means body text of at least 16 point, with 18 point as the ideal. RNIB defines large print as 16 point or larger, and UKAAF sets the same minimum with 18 point recommended. The minimum applies to page numbers, captions and contents entries too, not only to the main text.
What is the best font for a large print book?
A clear sans serif face such as Arial, Helvetica or Verdana is the safest choice, because the standards bodies recommend legible sans serif type. Set it in black on a plain white or cream page, align it left and avoid italics, underlining and long blocks of capitals. Whatever face you choose, compare its lowercase height with Arial and size up if it looks smaller.
Does a large print edition need its own ISBN?
Yes. A large print edition has a different format, trim size and page count from your standard paperback, so it is a separate edition and needs its own ISBN. Set it up as its own paperback listing on KDP and keep its interior and cover files separate from your other editions.
What trim size should I use for large print on KDP?
Use 6 by 9 inches as the practical minimum for shorter books, and consider 7 by 10 inches for longer novels and most nonfiction. Larger sizes such as 8 by 10 inches suit workbooks and illustrated books. Larger trims are easier to read but cost more to print, so check the printing cost at your final page count before you price the book.
Who buys large print books?
The core buyers are readers with low vision and older readers who find standard print tiring. Readers with dyslexia and readers recovering from eye treatment also choose large print, as do libraries that stock large print sections for their communities. It is a loyal audience that returns to authors whose editions are genuinely comfortable to read.
The Bottom Line
A real large print edition is built, not stretched. Set at least 16 point type, aim for 18, choose a clear sans serif face, space the lines generously, align left, pick a trim that keeps lines comfortable, and publish and label the book as its own edition with its own ISBN. Do that, and the words large print on your cover will be a fact your readers can trust for hundreds of pages.
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