1. Label PDF
One unencrypted FNSKU label PDF, up to 50 pages and 20 MB.
Pre-print FNSKU control
Catch the wrong label before the printer does.
Upload a label PDF and a pack list. LabelProof decodes supported barcodes, reconciles counts, and returns PASS / WARNING / FAIL / NEEDS REVIEW with page evidence.
Free public beta. No payment on this site.
How it works
2. Pack list
UTF-8 CSV with required fnsku and quantity columns.
3. Evidence report
Page-level findings you can inspect before print.
Supported and unsupported
In scope
Unencrypted PDF labels. Code 128 / FNSKU-style values. UTF-8 CSV pack lists. Exact quantity reconciliation. Human review before any PASS.
Out of scope
Password-protected PDFs, XLSX, photos, free-form packing slips, guaranteed Amazon acceptance, or 100% autonomous accuracy on unknown layouts.
Need the physical-label rules too? Read the FNSKU size, print, and placement checklist.
Synthetic demo
These files are marked DEMO — SYNTHETIC DATA. They are not customer files.
FAQ
Is this free?
Yes. The public checker is free while this beta is open. There is no checkout and no price on the site.
Is this affiliated with Amazon?
No. LabelProof is an independent pre-print control tool. It does not speak for Amazon and does not guarantee inbound acceptance.
Where do files go?
The check runs on this server for the current beta. Do not send live customer files to general AI tools.
Can I try without my own files?
Yes. Download the synthetic PDF and CSV from this page, then start a free check.