KDPActivityBook
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Free KDP Tool

Image Color Inverter (Negative to Positive Line Art)

Invert white-on-black dark mode graphics into clean black-on-white line art ready for coloring books and printable KDP puzzle interiors.

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Print-ready KDP interiors and full-wrap covers, checked against Amazon KDP specifications.

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KDP Cover CalculatorSpine width and full-wrap cover sizeKDP Bleed & Margin CalculatorInside gutter margins and safe zonesKDP ISBN Barcode Generator300 DPI vector barcodes for book coversKDP Word Count to Page EstimatorCalculate formatted pages, spine & print costJPG to WebP ConverterConvert JPG images to next-gen WebP formatJPEG to WebP ConverterTransform JPEG photos into lightweight WebP
Order on Fiverr — From $25

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