Cover · C-BARCODE

Content collides with KDP barcode clear zone

Text, logos, or artwork overlap the paperback barcode clear zone on the back cover, which can block KDP's barcode or make it unreadable.

Severity
warning

Automatic repair
Manual / guided

Submission impact
KDP: warning

Rule ID
C-BARCODE

Error: Content collides with KDP barcode clear zone
Category: Cover
Severity: warning
Auto Repair: Not automatic
Rule ID: C-BARCODE
Affected: KDP=warning, Apple=unknown, Google=unknown, Kobo=unknown

Check this automatically with Cermify

Why this happens

Back-cover design fills the lower-right barcode area with art or text.
Publisher barcode placed in a different spot than KDP's reserved zone.
Scaled wrap shifted back-cover elements into the clear zone.
QR codes or badges stacked where KDP applies its barcode.

How platforms treat it

Platform	Result
KDP	warning
Apple Books	unknown
Google Play	unknown
Kobo	unknown

How Cermify detects it

Compute the KDP barcode clear rectangle for the trim configuration.
Test intersection against uploaded content boxes.
Flag overlaps as C-BARCODE.
Severity may elevate when collision is severe; treat as print-critical.

Automatic repair

Guided only. Automatically whitening the zone can destroy intentional backgrounds; move or clear content yourself with preview.

Manual fix

Identify the barcode clear zone on the KDP template (back cover, typically lower right).
Move text, logos, and busy art out of that rectangle.
Leave a clean flat area (or KDP-allowed background) for the barcode.
Re-export and confirm no content boxes intersect the zone.

Examples

Keep the KDP barcode clear zone free of content.

Incorrect

Back-cover badge rectangle intersects barcode zone
label: "Series logo"

Correct

Series logo moved above/aside clear zone
Barcode rectangle empty of competing art

FAQ

Does KDP always print its own barcode?

For standard paperbacks, KDP places a barcode in the reserved area. Keep that area clear unless you follow KDP's own barcode instructions.

Can I put my ISBN barcode elsewhere?

Follow current KDP cover guidelines. Colliding with their zone still fails this rule even if you supply another barcode.

Error or warning?

Reported as warning in-engine, but collisions can cause production issues—clear the zone before submitting.

Related errors

References

KDP barcode / clear zone guidelines
Cermify cover engine — C-BARCODE