Updated October 7, 2026. Verify changing platform requirements with the primary sources below.
What to know before you decide
- Each print format normally needs its own ISBN.
- KDP’s free ISBN is for use on KDP and uses the “Independently published” imprint designation.
- Your own ISBN can support your own imprint and can be used outside KDP when registered correctly.
Primary sources
For rules, fees and platform requirements that can change, verify the current source before acting.
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