Is the trim size right?
Use official Amazon.com and Japan KDP presets, plus custom paperback sizes in the published range.
Local desktop software for Amazon KDP authors
Did KDP reject your interior PDF again?
Turn a folder of finished page images into a correctly sized 300 DPI paperback interior. Choose trim size and bleed, preview the PDF locally, then export only when it looks ready for KDP Previewer.
Preview a real 10-page batch free before buying Pro.
- 001.png
- 002.png
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8.5 x 11 inBleed or no bleed300 DPIFit to page
Page 1Page 2Page 3
KDP-ready interior PDF
Preview PDFExport PDF
Independent from AmazonLocal-first file processingReview final files in KDP Previewer
Insufficient bleed?White borders?Wrong page size?
Built for the last mile
Why does a finished book still fail at upload?
KDP upload issues rarely feel creative. They show up as the wrong trim size, low resolution, missing bleed, margins too close to the edge, or a PDF canvas that does not match the book. Book Interior Kit is built to remove that file-preparation friction before upload day.
Do files stay private?
Imported images and generated PDFs stay on your computer in v1.
Can I test before paying?
Free users can test a real sample and preview the PDF before paying.
Product workflow
How does the app turn artwork into a KDP interior?
Import images, choose the KDP settings, preview the interior PDF, then export page images or a PDF when Pro is unlocked.
KDP author pain points
The issues that slow authors down are usually small, technical, and expensive to repeat.
Book Interior Kit is built around the publishing chores that happen after the artwork is finished: resizing, checking, ordering, previewing, and keeping files private until you decide to upload.
“My PDF looked fine, but KDP Previewer still complained.”
Book Interior Kit starts with the trim size, bleed mode, orientation, and 300 DPI page canvas first. The PDF is assembled from those settings so the preview file matches the book setup you chose.
“300 DPI sounds simple until every image has a different size.”
The app places each image onto a correctly sized page, keeps the final page dimensions consistent, and removes the guesswork from pixel math before export.
“Bleed, trim, and margins are where upload day gets messy.”
Choose bleed or no-bleed up front, then let the app center and fit artwork inside the selected KDP page format. It helps avoid pages that are too small, too large, or too close to the edge.
“Coloring books need backing pages, but adding them by hand is tedious.”
When anti-bleed pages are enabled in the desktop app, a gray-black backing page can be inserted after each artwork page for coloring book interiors that need show-through protection.
“One wrong filename can scramble the whole book.”
Batch import keeps page order predictable by sorting files before conversion, so the finished PDF follows the sequence of the artwork folder.
“I do not want manuscript files uploaded to another tool.”
The desktop workflow is local-first. Imported artwork, previews, generated page images, and interior PDFs stay on your computer in v1.
“I do not want to pay before I know the output fits my book.”
The free version lets you process a real 10-image sample and preview the PDF. Pro only matters when you are ready to export without limits.
“No tool should promise KDP approval.”
Book Interior Kit reduces common file-preparation errors, but the final step is still yours: review the exported interior in KDP Previewer and follow Amazon’s latest publishing requirements.
Answer hub
Short answers for the questions authors actually search.
Focused pages for authors, search engines, and AI answer engines that need a direct explanation before sending someone to the product.
Should my KDP coloring book interior use bleed or no bleed?Why does KDP say my interior has insufficient bleed?What size is an 8.5 x 11 KDP interior with bleed?How do I make a KDP coloring book PDF from images?How should I name image files so PDF pages stay in order?How can I preview a KDP interior PDF before exporting?Is there a local tool for converting images into a KDP PDF?Canva vs local KDP PDF workflowWhy does my KDP coloring book page have a white border?Convert KDP images into an interior PDFUnderstand 300 DPI for KDP interior pagesUse coloring book backing pages wisely
Batch image conversion
PNG, JPG, WebP, and OS-converted TIFF files can be prepared as ordered KDP pages.
Bleed and no-bleed setup
Generate page dimensions for common KDP paperback and hardcover interior workflows.
Color controls
Keep color artwork, convert to grayscale, or prepare black-and-white interiors.
PayPal license unlock
One PayPal purchase issues a signed Pro license key for Windows and macOS.
Four simple steps
How do I go from artwork folder to upload-ready review?
Import artwork
Drop in the files you already made for the book.
Choose KDP settings
Pick trim size, bleed, orientation, fit mode, and color mode.
Preview locally
Check the generated interior PDF before you export.
Export with Pro
Unlock unlimited batches, PNG page export, and PDF export.
Sample output
What will the output look like before upload?
Example: import 001.png through 120.png, choose 8.5 x 11 in, pick bleed or no bleed, preview locally, then export a paperback-ready interior PDF when Pro is unlocked.
Input folder: 001.png - 120.pngTrim: 8.5 x 11 inMode: local preview firstOutput: interior PDF
Pre-upload readiness check
Am I ready to export this interior?
Use this quick check before turning a folder of images into a KDP interior PDF.
2/4 checks complete
A few checks remain.
Finish the missing setup items first. Book Interior Kit is most useful when page order, trim size, and bleed mode are already clear.
Free installers
Can I try it before I pay?
Install the Windows app from Microsoft Store. The signed and notarized macOS DMG is available as a direct download.
Windows app
Install from Microsoft Store. Free mode is included and Pro is unlocked inside the app.
Download WindowsmacOS app
Signed and notarized Mac installer. Free mode is included; Pro can be unlocked with a PayPal license key.
Download macOSOne-time Pro access
What does Pro unlock after the preview works?
One-time Pro access · Windows 10/11 and macOS · no subscription
- Unlimited image batches
- Official KDP presets plus custom paperback sizes
- Export paperback-ready page images
- Export interior PDF files
- Signed Windows and macOS app builds
- PayPal license key for both platforms
FeatureFreePro
Batch size10 images per batchUnlimited batches
PDF previewIncludedIncluded
Export page imagesPreview onlyPNG export
Export interior PDFPreview onlyPDF export
PurchaseNo account neededOne-time PayPal license
FAQ
Have install, license, privacy, or KDP upload questions?
The complete FAQ lives on the static /faq page so support answers stay in one searchable place.
Open the full FAQ