KDP Cover Spine Fix

My paperback cover (8.5 × 11 in.) is basically done, but the spine is off just enough for Amazon KDP to keep rejecting it. The book runs somewhere between 100 – 300 pages; I haven’t nailed down the exact spine width, so I need you to calculate it correctly, adjust the artwork, and give me a print-ready file that will sail through KDP’s previewer.

I’ll send you the current PNG of the full wrap. From there, please:

• Work out the precise spine measurement based on my final page count and the paper type KDP uses.
• Resize and realign the spine on the existing design so all text and graphics sit inside KDP’s safe zones.
• Export the finished cover as a high-resolution PDF with bleed, ready for immediate upload.

It should pass KDP’s automated checks without any additional tweaks. Let me know if you need the ISBN or any other details to position the barcode area correctly, and give me an estimated turnaround time when you respond.