on Just Publishing Advice:

When you prepare your print-on-demand (POD) book cover, it’s always best practice to output it with print to PDF.

Depending on the program, software, or online app you use to create your book cover, you will have other options to create a PDF file.

These will probably include options to save to PDF and export to PDF.

But while these two options may seem logical, they are not the best methods to create your book cover file for publishing.

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