About PreflightPress

PreflightPress helps self-publishers catch the mechanical errors that get paperback uploads rejected or misprinted on Kindle Direct Publishing: dimensions, bleed, spine, resolution, margins, metadata.

The site grew out of a working verification service. We check real manuscripts — the actual PDF files authors are about to upload — against KDP's published specifications and the failure patterns that show up in real rejections. The free checker on this site is the self-serve version of those checks; the guides document the fixes, one error at a time, with every rule re-checked against KDP's current specifications before publication.

Two commitments shape how the site runs. First, your files stay yours: every check runs locally in your browser, and your manuscripts are never uploaded to or stored on our servers. Second, no filler: pages are published when they are verified, not generated in bulk to chase search volume.

PreflightPress is independent and is not affiliated with Amazon or Kindle Direct Publishing.