Images in KDP Books: Resolution, Color, Placement, and Accessibility

How do you know whether an image is actually ready for KDP?

Looking sharp on a computer screen is not enough. A photograph can become soft when it is enlarged for print. A diagram can lose important detail in the gutter. A color chart can become useless in a black-and-white edition, while an image that works beautifully in a paperback can be too small or awkward to read on a Kindle screen.

The difficulty is that KDP image requirements are different depending on what the image needs to do. Print brings resolution, bleed, margins, ink choice, and manufacturing into the equation. Reflowable eBooks introduce a different set of decisions around screen size, color, accessibility, and reader settings.

This guide explains how to prepare photographs, charts, maps, diagrams, and illustrations for both print and Kindle, and how to check the result before publication. For the wider production workflow, see the KDP paperback formatting guide, KDP eBook formatting guide, and KDP bleed and safe-zone guide.

What Resolution Do KDP Print Images Need?

KDP currently recommends that print manuscript and cover images have a minimum resolution of 300 DPI. Amazon also describes images below 200 DPI as low resolution.

The number only becomes useful once the final printed dimensions are known. KDP calculates resolution from the available pixels divided by the number of inches those pixels have to cover.

This is why changing a number in an image-properties box does not repair a low-resolution source. A 600 × 900 pixel image does not gain detail because its metadata has been changed from 150 DPI to 300 DPI. Reducing the physical size can improve its effective resolution; simply relabeling it cannot.

KDP also recommends inserting images rather than copying and pasting them, keeping them at their intended size, and avoiding enlargement after insertion. If Microsoft Word is part of the print workflow, check its image-compression setting as well. Word can automatically reduce image quality unless Do not compress images in file is enabled under Image Size and Quality.

For the final print file, flatten transparencies and layers and make sure the images are embedded properly. The current 650 MB KDP limit applies to the complete manuscript upload, not to each individual image, so enormous source photographs can still create conversion problems long before they improve the printed result.

Which KDP Print Color Option Should You Choose?

Before spending time adjusting color images, decide how the book itself will be manufactured. KDP currently gives paperback publishers three relevant ink choices: black ink, standard color, and premium color. Hardcovers support black ink and premium color, but not standard color.

The choice affects more than appearance. Color changes printing cost, minimum page-count options, paper, and the royalty left from each sale. It is also a decision worth getting right before publication. KDP currently locks the ink and paper type after a print edition has been published; changing from black ink to color, or between standard and premium color, requires setting up a separate book.

Color-space advice also needs to be specific to the file. For paperback cover images, KDP currently recommends CMYK and says spot colors are not compatible with its print-on-demand workflow. Amazon also warns against mixing color spaces in one print file because the result can vary unexpectedly.

Do not turn that cover instruction into a blanket claim that every KDP interior image must always be converted to CMYK. Interior workflows differ by source application and file preparation. Keep the color handling consistent, follow the specifications for the actual file being submitted, and order a physical proof when color accuracy matters.

What Color Profile Should Kindle Images Use?

Reflowable Kindle books use a different color workflow. Amazon currently specifies sRGB for Kindle images and says Kindle does not support CMYK as the intended color space. If a CMYK image is supplied, Amazon may convert it to sRGB during processing.

That makes a deliberate sRGB source preferable to leaving an automated conversion to decide how the colors change. The eBook should then be checked after conversion rather than approved from the original image files alone.

Transparency needs attention too. Amazon’s current reflowable-image guidance says transparent image areas are converted to white. A logo, diagram, or illustration that relies on a transparent background may, therefore, look different after publication, particularly if the surrounding Kindle page uses another background mode.

For common reflowable workflows, JPEG and PNG are the safest practical formats. JPEG usually suits photographs well, while PNG can preserve line art, diagrams, screenshots, and flat graphics more cleanly. Keep the source quality high, but expect Amazon to process and sometimes recompress the assets during conversion.

How Do Images Affect KDP Bleed and Margins?

An image that remains comfortably inside the page margins does not require bleed. An image, background, or illustration intended to reach the physical edge of the page does.

KDP currently requires bleed artwork to extend 0.125 inch beyond the top, bottom, and outside trim edges. If even one page in the interior requires bleed, KDP says the entire manuscript should be set up using the bleed dimensions, and bleed is supported through a fixed-format file such as a print-ready PDF.

Do not confuse the bleed allowance with the safe area for important content. For an interior with bleed, KDP currently requires at least 0.375 inch for the top, bottom, and outside margins, while the inside gutter depends on page count. A caption, face, map label, or important diagram element should not sit in the trimming or binding risk area simply because the background image extends there.

This distinction becomes especially important with photographs and diagrams that cross most of a page. Background pixels can disappear during trim. Information cannot. The KDP bleed and safe-zone guide gives the full bleed dimensions and current margin bands.

What Size Should Images Be in a Kindle eBook?

Do not carry the print rule of 300 DPI into a reflowable Kindle book as though an e-reader were a printing press. Kindle images are displayed on screens, so pixel dimensions, the proportion of the screen occupied by the image, and the clarity of the converted result are more useful than assigning an arbitrary print DPI value.

Amazon’s current reflowable-image guidance gives two particularly useful display recommendations for smaller devices:

Those figures describe display proportion, not a promise that every image should be forced to exactly 60% or 80%. A simple photograph may work well at another size, while a dense technical diagram may need almost the full available width. The converted book is the deciding test.

Keep captions as real text where possible rather than baking them into the bitmap. Amazon’s Kindle guidance specifically recommends HTML for figure captions, tables, and title text when the content can remain separate from the image. That gives the reader better resizing, accessibility, and text rendering.

Large print masters do not automatically make better eBook assets either. A 40-megapixel photograph carried unchanged into a reflowable book can make the source unnecessarily heavy without producing a visible improvement on a phone. Optimize the eBook copy while retaining enough real pixel detail for the largest sensible display size.

Do Kindle Images Need Alt Text?

Yes. Amazon’s current guidance says images in reflowable Kindle books need text in the HTML alt attribute. The treatment depends on whether the image communicates information or merely decorates the page.

For linked images, Amazon recommends describing the purpose of the link rather than simply describing the picture. If clicking a cover thumbnail opens a sample, for example, the useful alternative text explains that action.

A chart or diagram also should not carry an important argument that the surrounding prose never states. Explain the conclusion in the text as well. That helps readers using assistive technology and readers who simply find the image difficult to interpret on a smaller screen.

Avoid turning ordinary paragraphs or headings into images to preserve a particular typeface or layout. Image-based text loses normal reflow, search, selection, resizing, and accessibility features. If the words can remain words, keep them as text.

Should You Print a KDP Book in Black and White or Color?

The presence of a few color images does not automatically make a color interior the better product. The useful question is whether readers lose something important when those images are converted to grayscale.

A photography book, illustrated children’s title, art guide, or instructional manual may depend heavily on color. A business book with three decorative charts may not. Test the actual images in grayscale rather than deciding from the source file. Several bright colors can collapse into nearly identical gray values once the hue disappears.

The production economics can change substantially too. KDP calculates printing cost from factors including ink type, page count, trim size, and marketplace. Standard color reduces the cost relative to premium color for eligible paperbacks, but it also produces a different paper and image result. Premium color costs more because it is designed for stronger image reproduction.

Price the book after choosing the print specification, not before. A market may support a $12.99 black-and-white workbook comfortably and reject the price needed to make a premium-color version economically sensible.

For more detail on the current royalty and manufacturing relationship, see the KDP print royalties and cost guide.

How to Check KDP Images Before Publication

Image problems become expensive when they are discovered after pagination is complete. Keep a simple image inventory during production so every asset can be traced before the final export.

Then inspect the files rather than the source application. For print, check the exported PDF in KDP Print Previewer and pay particular attention to full-page images, captions close to margins, fine diagrams, screenshots, and anything that depends on subtle tonal variation.

A physical KDP proof copy is especially valuable when images carry important information. Paper, ink, trim, binding, and manufacturing variation cannot be judged fully from a monitor. Look at photographs from a normal reading distance, check whether labels disappear into the gutter, and compare pages rather than assessing one isolated image.

For Kindle, test the converted eBook at several screen sizes rather than checking one desktop preview. Pay special attention to charts, maps, captions, screenshots, and anything containing small text. An image that looks fine on a tablet can become almost useless on a phone.

Finally, audit the relationship between the pictures and the manuscript. Figures should appear near the passages that introduce them, numbering should remain sequential, captions should use consistent punctuation and terminology, and every reference such as “see Figure 4.2” should still point to the right image after the final edit.

Frequently Asked Questions

What to Do Next

Start with the output rather than the image file. For print, decide the ink option and final image dimensions before judging resolution. For Kindle, prepare an sRGB asset that remains clear at realistic screen sizes and does not depend on a fixed layout or transparent background to work.

Then test the information, not merely the file. Check whether charts still make sense in grayscale, whether labels survive a smaller Kindle screen, whether important content stays away from trim and binding risk, and whether a reader who cannot see an image can still understand its purpose.

Once the visuals are stable, lock the captions, cross-references, figure numbering, and surrounding text before the final layout. A beautifully prepared image still creates a poor reading experience if the manuscript calls it Figure 8 when the reader is looking at Figure 9.