Formatting Images and Photos in Your Book: Print and Ebook

Text-only formatting gets most of the attention in self-publishing guides, but a huge number of books, memoirs with family photos, cookbooks, children's picture books, business books with charts, travel guides, textbooks, live or die on how well their images are handled. Get it wrong and you end up with one of two failure modes: a print interior where photos look muddy or pixelated despite looking fine on your laptop screen, or an EPUB so bloated with oversized images that it takes forever to download and triggers file-size warnings on some platforms.

Both problems come from the same root cause: print and screen have fundamentally different resolution requirements, and treating an image as one-size-fits-all almost always means it's wrong for at least one format. This guide walks through what each format actually needs, how to prepare images so you don't have to build two separate libraries, and the placement and accessibility details that are easy to miss.

Why print and screen need different things from the same image

An image file is just a grid of pixels. What matters is how many of those pixels get packed into each inch of physical space when the image is reproduced, whether that's an inch of paper or an inch of screen.

Print resolution is measured in DPI (dots per inch, sometimes called PPI, pixels per inch, in this context they're used interchangeably by most authors and print services). A commercial printer needs a much higher pixel density than a screen to avoid visible pixelation, because you view a printed page much closer and print has no anti-aliasing tricks to smooth out a low-resolution image. The commonly cited target for print-quality images is 300 DPI at the size the image will actually appear on the page. That last part matters: an image that's 300 DPI at 2x3 inches is not 300 DPI if you stretch it to fill a 6x9 inch page, the pixel density drops as the physical size increases, even though the file itself hasn't changed.

Screen resolution works differently. A typical screen displays around 72 to 96 pixels per inch for standard displays, though high-density ("retina-class") phone and tablet screens pack in more, which is why an image that looks perfectly sharp on a laptop can look soft when you zoom into it on a modern phone. But the key difference from print is that screens don't need anywhere near 300 DPI worth of data to look sharp, because the physical viewing distance and the way pixels render on an illuminated display are different from ink absorbed into paper. An image that's roughly 1,500 to 2,000 pixels on its longer dimension is generally plenty for an EPUB's interior images, even on a high-density tablet.

The practical consequence: if you prepare an image at screen resolution and then use it in your print interior, it will look noticeably softer or pixelated on the page, even though it looked fine every time you checked it on a monitor. This is the single most common image mistake in self-published books, and it's almost invisible until the physical proof arrives in the mail.

The real difference between "looks sharp on screen" and "is print resolution"

It's worth being direct about this because it trips up so many first-time authors: a photo downloaded from a website, a screenshot, or an image pulled from a social media post is almost never high enough resolution for print, even if it looks crisp when you view it at normal size on your monitor. Screens render images at a much lower effective density than a printing press, so an image can clear the "looks fine on screen" bar while falling far short of the "looks fine on paper" bar.

The only reliable way to know if an image is print-ready is to check its actual pixel dimensions against the physical size it will occupy on the page, not to eyeball it on a screen. A 600x400 pixel image might look acceptable as a small web thumbnail, but printed at 4x6 inches it works out to only 100 DPI, well short of the quality a reader expects from a finished book. If you only have access to a lower-resolution version of an important image (an old family photo, for instance, or an image supplied by a client), the honest options are to print it smaller (increasing its effective DPI), accept a softer result, or track down a higher-resolution source. Artificially upscaling a low-resolution image rarely produces a result indistinguishable from genuine high-resolution source material, so it should be treated as a last resort, not a fix.

Color mode: what to use for print and why it matters for cost

Most self-published print interiors are formatted in grayscale or standard (black and white) interior printing, which is the cheapest and most widely available print option across KDP, IngramSpark, and other print-on-demand services. If your book's images are genuinely black and white or grayscale photographs, this is straightforward.

If your book needs color images, charts, or illustrations reproduced in color on the printed page, you need a color interior, which is a meaningfully different (and more expensive) print option than standard black and white interior printing. Rather than quoting a specific price here, since print costs vary by page count, trim size, and can change, check your print platform's current price calculator before finalizing your format decision. The cost difference between standard and color interior printing is often large enough to change the economics of a book, particularly for longer manuscripts, so it's worth checking early rather than after your interior is fully designed. For a deeper look at when color interior printing makes sense and how to prepare files for it, see our guide on color interior printing.

Ebooks don't have this cost consideration in the same way, EPUB renders color images at no extra cost regardless of how many appear in the file, since there's no physical ink involved. This is one of several reasons some illustrated or photo-heavy books are priced or packaged differently between their print and ebook editions.

Placement conventions: inline, full-page, and captioned

How you place an image relative to your text sends a signal to the reader about its importance and how it should be read. A few conventions cover most books:

Inline images sit within the flow of body text, sized to roughly match the text column width or smaller, used when an image supports or illustrates a specific point being discussed in the surrounding paragraph. This is common in nonfiction, how-to books, and business books with diagrams or screenshots.

Full-page images occupy an entire page on their own, typically used for standalone photographs, section dividers, or images meant to be appreciated on their own rather than as a supporting element to nearby text. Memoirs with family photo sections and heavily illustrated nonfiction often use full-page treatment for key images.

Image-plus-caption blocks pair an image with a short line of explanatory or attributive text directly beneath it, typically set in a smaller or italicized style distinct from body text (styled with a dedicated CSS class or paragraph style, not manual formatting). Captions matter more than authors often expect, a photo without any caption leaves the reader guessing who or what they're looking at, which undercuts the emotional or informational payoff the image was meant to deliver.

Whichever convention you choose, apply it consistently throughout the book. A reader who sees three different image treatments in the first twenty pages will find the book harder to follow visually, even if each individual image looks fine on its own.

How EPUB handles image scaling and reflow

Print pages have a fixed size, so an image is placed at an exact physical dimension and stays there. EPUB is different: a reflowable EPUB has to accommodate everything from a small phone screen held in portrait orientation to a full-size tablet in landscape, and the same image has to look correct on all of them without you creating a separate version for each device.

The mechanism that makes this work is percentage-based CSS width rather than fixed pixel dimensions. An image styled with a width set as a percentage of its container (for example, 100% of the available text width) will scale down proportionally on a narrow phone screen and scale up (up to its native resolution) on a wider tablet screen, always filling the appropriate amount of space without ever overflowing the edge of the screen or leaving awkward whitespace. An image given a fixed pixel width, by contrast, will overflow a screen narrower than that pixel width, forcing the reader to scroll horizontally, one of the more jarring reading experience failures in a poorly built EPUB.

This is also why oversized source images are a real problem for EPUB even though the display will scale them down: the reading app still has to load, decode, and store the full-resolution file, so a handful of unnecessarily huge images can make an EPUB slow to open and unnecessarily large to download, without providing any visible quality benefit since the display never renders anywhere near that pixel density in the first place.

Alt text: not optional, and not just for accessibility compliance

Every image in an EPUB should carry alternative text (the alt attribute) describing what the image shows. This text is read aloud by screen readers for readers with visual impairments, and it displays as a fallback if an image fails to load for any reason on a particular device.

For an image that conveys real information, a photograph central to a memoir's narrative, a diagram in a how-to book, a chart in a business book, write alt text that actually describes what's shown and why it matters, not a generic placeholder like "image" or the file name. For purely decorative images that carry no informational content (a small ornamental divider graphic between sections, for instance), the correct practice is an empty alt attribute (alt=""), which tells assistive technology to skip the image entirely rather than announcing something meaningless like "image1234.jpg." Leaving decorative images without any alt attribute at all, rather than an intentionally empty one, is a common mistake that forces screen readers to announce the file name instead, which is worse than saying nothing.

A practical workflow: one image set, not two

The efficient way to handle images across both formats is to prepare each image once at print resolution and let your formatting tool (or a version-specific export step) produce the screen-appropriate version, rather than sourcing or exporting two entirely separate image libraries by hand.

1. Source or scan every image at the highest resolution reasonably available. It's far easier to downsample a high-resolution image for EPUB than to upscale a low-resolution one for print. When in doubt, keep the largest version you have access to as your working master.
2. Check each image against its actual print size before finalizing your interior. An image that's comfortably above 300 DPI at a small size may fall below that threshold if you later decide to enlarge it to fill more of the page.
3. Let your EPUB export step handle downsampling. A formatting tool that generates both your print and EPUB files from one source manuscript can typically compress or resize images appropriately for each output automatically, so you're not manually maintaining two versions of every image and risking them drifting out of sync when you make an edit.
4. Set color images to grayscale deliberately, not by accident. If your print interior is standard black and white but your source images are in color, either convert them to grayscale intentionally so you can see exactly how they'll print, or confirm your print platform performs this conversion in a way that preserves contrast and detail well. Some color photographs lose important detail when converted to grayscale without adjustment.

Book types where this matters most

Some categories of book are especially image-dependent, and the stakes for getting image formatting right are correspondingly higher:

Children's picture books are often built around illustrations as much as (or more than) text, frequently using fixed-layout formatting rather than reflowable EPUB so that text and image placement stays exactly as designed across devices. See our guide on children's book formatting for the specific considerations that apply there.

Cookbooks combine recipe photography with structured text (ingredient lists, numbered steps), and often benefit from a full-color interior to make finished dishes look appetizing. Our cookbook formatting guide covers the layout patterns specific to that category.

Memoirs and family histories commonly include a dedicated photo section or scattered personal photographs, often scanned from physical prints of varying original quality, which makes the "check actual resolution, don't just eyeball it" discipline covered above especially important.

Business and how-to nonfiction frequently uses charts, screenshots, and diagrams that need to remain legible at a range of sizes, screenshots in particular are easy to place at native resolution without checking whether that resolution is actually adequate once printed at the size the layout calls for.

Common mistakes to avoid

Frequently asked questions

What resolution should my book's images be?

For print, aim for roughly 300 DPI at the actual size the image will appear on the page, which means checking pixel dimensions against physical size, not just against how the image looks on a screen. For EPUB, roughly 1,500 to 2,000 pixels on the longer dimension is generally sufficient for a sharp result even on high-density screens, without unnecessarily bloating file size.

Can I use the same image file for both my print and ebook editions?

Yes, and it's the more efficient approach. Prepare your master image at the higher resolution print requires, then let your formatting tool downsample it for the EPUB export, rather than sourcing or maintaining two separate image sets that can drift out of sync over time.

Does adding color images always cost more to print?

It depends on your interior printing selection. If your interior is set to standard black and white printing, color images will typically print in grayscale at no extra cost, but they may lose visual impact. If you want images to actually appear in color on the printed page, you need a color interior option, which costs meaningfully more than standard printing on most print-on-demand platforms, check your platform's current pricing before deciding.

Do I need alt text if my book has very few images?

Yes. Alt text isn't a bulk requirement that only matters at scale, every image benefits a reader using assistive technology, and it costs nothing to include. Even a book with just a cover image and one or two interior photographs should have thoughtful alt text on each one.

Why does my scanned photo look worse in print than it did on my computer?

This is almost always a resolution mismatch: the scan was captured or saved at a resolution that looks acceptable on a screen but falls short of print quality once enlarged to fill a page. Re-scan at a higher resolution if the original source is available, or plan to print the image smaller to keep its effective DPI in an acceptable range.

The bottom line

Print and screen ask different things of the same image, print needs real pixel density at the size the image will actually appear, while screen needs far less density but is unforgiving of bloated file sizes and fixed-pixel layouts that don't scale. Preparing images once at the higher print standard, checking actual dimensions rather than trusting how something looks on a monitor, and letting your formatting tool handle the screen-appropriate export solves both problems without doubling your workload.

For the fuller picture of how EPUB handles structure, CSS, and accessibility beyond images, see our EPUB formatting best practices guide. If your book leans heavily on color photography or illustration, our guide on color interior printing covers the print-specific decisions in more depth. To prepare and place your book's images correctly across both formats without manual guesswork, get started in LiberScript.