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How Bookcut turns a Word file into a typeset KDP paperback in your browser

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A developer has built Bookcut, a browser-based tool that converts .docx files into typeset Amazon KDP paperbacks and EPUBs without any software installation. The tool tackles three core typesetting challenges: justified line spacing, optimal line-breaking, and widow/orphan control across fixed pages. Testing on the first three chapters of Pride and Prejudice showed that hyphenation — not the line-breaking algorithm — had the greatest impact on reducing loose, poorly spaced lines. The Knuth-Plass total-fit algorithm did outperform the simpler greedy method, but only meaningfully when hyphenation was already enabled. The page-breaking engine also enforces standard book design rules, preventing lone lines from being stranded at the top or bottom of a page.

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