https://www.opuspublishing.co/blog Practical self-publishing guides for indie authors from the Opus Publishing Co. team. en-US Fri, 25 Sep 2026 05:24:50 GMT https://www.opuspublishing.co/blog/choosing-a-book-trim-size https://www.opuspublishing.co/blog/choosing-a-book-trim-size Fri, 25 Sep 2026 05:24:50 GMT Choose your book trim size with confidence: KDP's page count limits by ink and paper, the large trim cost boundary, and what locks after you publish. Manuscript Formatting Amazon KDP https://www.opuspublishing.co/blog/kdp-paperback-spine-width https://www.opuspublishing.co/blog/kdp-paperback-spine-width Wed, 23 Sep 2026 21:59:58 GMT Use the KDP spine width calculator formula to get your paperback spine, full cover size and bleed right, and learn when KDP allows text on the spine. Book Cover Design Amazon KDP Manuscript Formatting https://www.opuspublishing.co/blog/kdp-paperback-royalties-explained https://www.opuspublishing.co/blog/kdp-paperback-royalties-explained Mon, 14 Sep 2026 23:46:20 GMT KDP paperback royalty calculation, explained: the 50% and 60% price thresholds, printing costs by page count and trim, and royalties at real prices. Amazon KDP Manuscript Formatting