Label PDF
One unencrypted PDF, up to 50 pages and 20 MB. The current beta supports Code 128 / FNSKU-style values.
PDF vs pack list
Check FNSKU labels before printing
Upload one label PDF and one canonical pack list. LabelProof decodes supported barcodes, reconciles FNSKU counts, and shows the exact pages that need human review.
Free public beta. No checkout. Not affiliated with Amazon.
What the checker compares
Canonical pack list
One UTF-8 CSV with required fnsku and quantity columns. Optional SKU, ASIN, and title fields can preserve evidence.
How to check a batch
- Export the final FNSKU label PDF you intend to print.
- Prepare a UTF-8 CSV pack list using the LabelProof template.
- Run the free check. LabelProof reconciles decoded identifiers and quantities.
- Inspect every page marked WARNING, FAIL, or NEEDS REVIEW.
- Review physical-label requirements and run a test print before the full batch.
Results and evidence
| Result | What it means | Next action |
|---|---|---|
| PASS | Decoded counts match the uploaded pack list after human review. | Complete the physical-label and test-print checks. |
| WARNING | A recoverable issue or duplicate input needs attention. | Read the finding and confirm the intended quantity. |
| FAIL | Missing, unexpected, or mismatched labels were found. | Correct the PDF or pack list before printing. |
| NEEDS REVIEW | Automation cannot safely make the final decision. | Inspect the cited pages and evidence manually. |
Errors it is designed to surface
- A required FNSKU is absent from the PDF.
- A decoded FNSKU is not present in the pack list.
- The PDF contains fewer or more labels than the requested quantity.
- A barcode candidate cannot be decoded reliably.
- The pack list repeats or conflicts on the same FNSKU.
See all five finding types in the synthetic sample report.
What it does not verify
LabelProof does not inspect adhesive, contrast, physical size after printing, label placement on the unit, hidden manufacturer barcodes, product-condition accuracy, or marketplace-specific shipment eligibility. Read the FNSKU label requirements checklist and verify the current instructions shown in your Seller Central workflow.
FNSKU checker FAQ
What does the checker compare?
Supported barcodes decoded from one unencrypted PDF are compared with FNSKU identifiers and quantities in one UTF-8 CSV pack list.
Does PASS guarantee Amazon acceptance?
No. PASS is a pre-print reconciliation result after human review. It does not verify the physical unit or guarantee Amazon acceptance.
Can it check photos, XLSX, or password-protected PDFs?
No. Those formats are outside the current beta scope.
Can I test it without customer files?
Yes. Use the clearly marked synthetic PDF and synthetic CSV.
Reviewed 24 August 2026. Independent pre-print control; not Amazon guidance or a guarantee of acceptance.