Free tools for KDP publishers
Barcodes, PDFs, interiors, royalties and listing helpers. Everything runs in your browser, so your files never leave your device.
Files & print
Turn any ISBN-13 into a print-ready EAN-13 barcode with optional price add-on. Download SVG or PNG.
Make a crisp QR code for your book, back matter or author site. Custom colors, PNG or SVG.
Check if an image has enough resolution to print sharp at your trim size (300 DPI rule).
Convert PDF pages into high-resolution PNG or JPG images, right in your browser.
Merge several PDFs into one file in any order. Nothing is uploaded.
Reorder, rotate, duplicate or delete pages in a PDF with drag and drop.
Planning & numbers
Estimate finished length, royalty per sale and monthly income for your audiobook on ACX.
Plan a book series: release dates, word counts, writing pace and launch timeline.
Create print-ready lined, dotted, grid or blank interiors for low-content books as a PDF.
Listing & marketing
Fill your 7 KDP keyword slots without wasted characters, duplicates or risky words.
Compare two book descriptions side by side: hook, readability, length and power words.
Format your Amazon book description with bold, italics and lists, and copy KDP-ready HTML.
Preview your A+ Content modules on desktop and mobile before you upload them to KDP.
Make your next book faster
Prompt packs and AI tools from Duhi for KDP creators.
