DPI(Dots Per Inch)
Also called: resolution, print resolution
Definition
DPI (dots per inch) is the print-resolution measure of a coloring book page. KDP requires a minimum 300 DPI on every interior image at the page's printed size. A 300 DPI 8.5 x 11 inch page is 2550 x 3300 pixels. Files below 300 DPI print fuzzy and trigger a quality warning at upload.
What does DPI mean for a KDP coloring book?
DPI stands for dots per inch and describes the resolution at which an image will print. A page printed at 300 DPI packs 300 ink dots into every linear inch, which is the standard for crisp text and clean line art. KDP's required minimum is 300 DPI on every interior image and cover.
How many pixels is 300 DPI for a coloring book page?
For an 8.5 x 11 inch page at 300 DPI, the pixel dimensions are 2550 wide by 3300 tall. With KDP's required 0.125 inch bleed on three sides the full file size becomes 2588 x 3375 pixels. AI-generated coloring pages must hit this size or be upscaled before manuscript assembly.
What happens if DPI is too low?
KDP runs a pre-flight resolution check at upload. Images below 300 DPI at their placed size trigger a yellow warning ("low resolution detected") or a hard rejection depending on severity. Even when KDP accepts a low-DPI file, the printed result has visible pixelation along curved lines, which makes the book look amateur and damages reviews.
Why is 300 DPI specifically the KDP standard?
300 DPI is the historical print-industry floor for crisp continuous-tone reproduction. Below that, the human eye starts seeing individual dots at normal reading distance. Coloring books are especially exposed because clean, smooth curves are central to the buyer's perception of quality, so 300 DPI is the floor, not a target.
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Related terms
Manuscript
The manuscript is the interior PDF file uploaded to KDP, distinct from the cover file. For coloring books, the manuscript contains all the line-art pages, any front matter (title page, copyright), and any back matter (about the artist, also-by). KDP requires a print-ready PDF at 300 DPI with embedded fonts and bleed.
Bleed
Bleed is the 0.125 inch (3.2 mm) extension of artwork past the trim line of a KDP paperback page. It exists so that small variations in the cutting machine do not produce a thin white sliver at the page edge. Coloring books with full-page line art must include bleed or risk KDP rejection.
Trim size
Trim size is the final physical dimensions of a KDP paperback after cutting, measured in inches (US) and rounded to 0.001 inch. The most common KDP coloring book trim sizes are 8.5 x 11 inches (standard letter), 8 x 10 inches (compact), and 8.5 x 8.5 inches (square). Trim size is set at title creation and cannot change later.