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Tell us the book. One idea is enough to start.

Describe the book you want, in a sentence or two. You get the plan and the first chapter before anyone asks who you are.

No account, no card. The outline and the first chapter are free.

What you get

Every print claim points at a row like this one.

When the files are built, they are measured. Each check opens the rendered interior and cover, measures one thing, and records the value it found beside the value the rule asks for, with the revision of the KDP specification table it was checked against. The report is shown in the app before you download anything, and it goes out in the export pack beside the files it describes.

One expanded row of a preflight report. The check is that every page is the trim size you chose. Measured: 432.00 by 648.00 pt on all 28 pages. Required: 432.00 by 648.00 pt plus or minus 0.25 pt on every page. What was checked: trim size on every page. Whose rule this is: a rule Amazon KDP publishes, kdp-spec-v1 rows A2 and B13.
One check from a real report on a 28-page book built during development, 5 September 2026.

The same row, set out for this width

Every page is the trim size you chose

Measured
432.00 by 648.00 pt on all 28 pages
Required
432.00 by 648.00 pt plus or minus 0.25 pt on every page
What was checked
Trim size on every page
Whose rule this is
A rule Amazon KDP publishes, kdp-spec-v1 rows A2 and B13
Result
Pass

How the report works, and what it does not claim