From trim-size math to a print-ready paperback wrap to a 3D mockup for the launch campaign — the same five-stage workflow indie authors use to ship a KDP paperback in 30 minutes, broken out as five free standalone tools you can drop into at any stage.
Calculate full wrap dimensions, spine width, and bleed for any KDP paperback.
Spine width in inches, mm, and pixels — for any page count and paper type.
Turn your ebook front cover into a print-ready KDP paperback wrap PDF.
Validate your wrap PDF before uploading — bleed, resolution, spine alignment, and KDP rejection patterns.
Drop your cover into a 3D book mockup for Amazon A+ content, social posts, and ARC promo. Free, no watermark.
Most KDP authors learn the print-cover workflow the hard way: upload a cover, get rejected for spine width, fix it, re-upload, get rejected for bleed, fix it, re-upload, get rejected for the print profile. Each rejection costs a day. Each rework costs an hour of design tool wrestling. Multiply across a 3-book launch and you've lost a week that should have been spent writing the next book.
The five tools above collapse that workflow into a single pass. Calculate the wrap dimensions for your trim and page count (Stage 1). Confirm the spine math against your paper choice (Stage 2). Convert your ebook front cover into a full print wrap with the back blurb and spine text built in (Stage 3). Preflight the result so the KDP validator has nothing to reject (Stage 4 — coming this month). Drop the finished cover into a 3D mockup for the launch campaign (Stage 5 — coming this month).
Every tool here is free to use. The wrap converter charges 3 credits for the final PDF export — the same credits that power our AI cover generator at /wizard, so you don't need a separate subscription. Sign up gets you 3+1 HD credits to test the full workflow before paying.
No. Each tool stands on its own. The numbered order shows the most common path (Plan → Spec → Build → Check → Market), but if you only need spine width, jump straight to Stage 2.
Those two tools (Preflight Checker, 3D Mockup Generator) ship later this month. We list them here so you can see the full workflow up front instead of discovering the gaps after you've started.
Calculations are free, always. The Ebook→Paperback Converter lets you preview the wrap for free; only the final PDF export costs 3 credits (same credit you'd use to generate an AI cover at /wizard). The 3D Mockup Generator will be fully free when it ships — no watermark, no sign-up gate.
Their tools work in isolation — you have to know which standalone calculator to open and how the results feed the next step. Our workflow is designed as a single pass: each tool can pass its outputs (trim size, spine width, paper type) directly into the next via a "Continue →" link, and the final stages connect back to our AI cover generator at /wizard.
No. The tools never call KDP's API and don't require any account on Amazon's side. We use KDP's PUBLISHED specs (trim sizes, paper thickness, bleed, safe zones, resolution) to do the math locally.
Stage 1 and Stage 2 (size + spine calculators) work for hardcover — KDP's hardcover specs use the same math with different paper thickness constants. Stage 3 (Wrap Converter) currently outputs paperback wraps only; hardcover case wrap support is on the roadmap.
Not for the calculators (Stages 1, 2). The Wrap Converter requires sign-in because it consumes credits — but signup is free and gives you 3+1 HD credits to test before paying.
Each tool's CTA ("Generate a cover at this size →" / "Open cover designer →") passes the trim, spine width, and paper type as URL parameters to /wizard. The AI generator uses those as hard layout constraints so the cover comes out at the right wrap size on the first generation — no re-rendering after the fact.