Bindrik turns your artwork into a KDP-ready interior and cover for Amazon print-on-demand. Bleed, gutter, page count, spine width and barcode zone are worked out from the numbers Amazon publishes, with trim and safe-area guides on every page. It is tested against a colouring book KDP already accepted. Runs offline on your Mac; nothing is uploaded. $69 once, no subscription, full-featured free trial (exports watermarked until you add a key).