Create KDP color-by-number books without Photoshop
Turn photos and illustrations into numbered coloring pages, build a complete interior in batches, and export print-ready files at the size Amazon expects.
No credit card · 10 free credits every month
Test a page from your book right now — free, no account
Upload a photo and use the real converter in your browser. Nothing is uploaded to a server — conversion runs on your machine.
JPG, PNG, or WebP · up to 12 MB
Processed in your browser, never uploaded
The preview is the real converter — switch patterns, zoom, and inspect the color key. Exporting a 300-DPI, KDP-ready PDF happens in the Studio, free with every account.
What is a KDP color-by-number book?
A KDP color-by-number book is a low-content paperback whose interior is a set of numbered coloring pages, each paired with a color key, usually with solution pages at the back. The work is rarely the concept — it is producing sixty to a hundred pages that share one visual style, sit correctly on the trim size, and print at a resolution the press will accept. Doing that by hand in an image editor takes days per book. Mosaci does the conversion, numbering, color key and export in one batch, so the effort goes into choosing the images instead of processing them.
What publishers get out of it
- Pages render at 8.5 × 11 in and 300 DPI, with the DPI written into the file
- Batch a folder of images with one pattern, cell size and palette across the set
- Numbered cells generated against an automatic color key
- Solution pages produced alongside the numbered interior
- Export as PDF for upload, PNG per page, or ZIP for the whole batch
- Ten mosaic patterns, so a catalog of books does not look repetitive
- Publish and sell what you make from images you hold the rights to
- 10 free credits every month — enough to test a style before committing to a book
From a folder of images to a book interior
- Step 1
Gather the images
Pick a theme and collect the photos or illustrations for it. This is the part that decides whether the book is good; everything after it is production.
- Step 2
Batch the conversion
Upload the folder and set the pattern, cell size and palette once. Those settings apply across the batch, which is what gives the interior a consistent look.
- Step 3
Export the interior
Take the numbered pages and answer keys as a print-ready PDF at 8.5 × 11 in and 300 DPI, then upload it to KDP as your interior file.
Who publishes with Mosaci
Publishers building a catalog
Produce a series in one style, then switch pattern for the next title so the books stay distinct without restarting the workflow.
First-time low-content authors
Test a theme with a handful of pages on the free credits before committing the time to a full interior.
Publishers with a backlog of images
If you already have the photos and not the hours, our production service converts the set and returns a finished interior.
Etsy and print-on-demand sellers
The same export works as a digital download or a POD interior — the files are not locked to Amazon.
Questions about publishing on KDP
Can I publish color-by-number books made with Mosaci on Amazon KDP?
Yes. Pages you generate from images you hold the rights to are yours to publish and sell, including on Amazon KDP, Etsy and print-on-demand stores. The license page sets out the full terms.
What page size and resolution does Mosaci export?
Pages render on a full 8.5 × 11 in letter page at 300 DPI, and the exported files carry that DPI in their metadata rather than defaulting to 72 — which is what stops a print service from treating a 2550 × 3300 px page as an oversized screen image.
Can I convert a whole folder of images at once?
Yes. Upload a folder and the batch runs with one pattern, cell size and palette setting across every page, which is what keeps a hundred pages reading as a single book instead of a hundred unrelated conversions.
Does Mosaci produce the answer pages?
Yes. Solution pages are generated alongside the numbered interior, so the back matter of the book is produced in the same pass rather than assembled by hand afterwards.
What do I need to make a color-by-number book?
Images you have the rights to, a trim size, and a page count. Mosaci handles the conversion, numbering, color key and export; you supply the images and the book concept, and upload the finished interior to KDP.
What if I have 100 images and no time?
Our production service takes the images and returns a finished, print-ready interior. Batches start at around 50 pages and run to 500 or more. Send one image first and we will convert a free sample so you can judge the style before committing.
Related tools & guides
See it on a real photo
Each example shows the original photograph beside the outline, the colored render, and the palette pulled out of it.
Browse the full gallery
Guides on this
How to Create a Coloring Book From Photos
The full workflow for turning a photo collection into a finished coloring book: selecting, converting, standardising, assembling, and preparing for KDP.
Coloring Book Interior Design: Layout & Margins
How to build a professional coloring book interior — margins, bleed, image sizing, page order, front and back matter, and print testing.
Coloring Book Quality Control Checklist
A complete quality-control checklist for a coloring book before you publish — source images, page design, layout, file quality, and consistency.
Coloring Book Page Sizes: A Complete Guide
How to choose the right coloring book page size — trim size, portrait vs landscape, margins, bleed, and how 8.5x11 fits into home printing, downloads, and KDP.
Start building your book interior
Convert a photo without an account to see the result. Creating one is free and takes a moment — it comes with 10 credits every month and no card.
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