Platform acceptance is not the whole question
A retailer may allow publication without a publisher-supplied ISBN while another distributor, library workflow, or metadata partner may benefit from or require one. Decide based on the entire distribution plan, not a single storefront.
Each format is a distinct product
Paperback, hardcover, audiobook, and ebook editions are different product forms. When ISBNs are assigned, the identifier should correspond to the specific edition rather than being shared casually across formats.
Keep identifier records centralized
Maintain a master record showing which ISBN or platform identifier belongs to each format. Use the same value consistently in the book file, distributor account, catalog records, and internal publishing files.
Check the target channel
Before assigning or omitting an ISBN, review the current requirements of the retailer or aggregator you intend to use. Platform rules can change.
Primary sources
- ISBN International — international ISBN overview
- PublishDrive upload guide — current distributor upload and metadata workflow