UPC to ASIN
Map wholesale UPCs to Amazon ASINs — free lookup and API for sellers and developers.
Free daily lookups · UPC, EAN, GTIN, ISBN & ASIN · 1.6B+ products
**UPC to ASIN** conversion is how you connect supplier barcodes to Amazon listings. Whether you need **upc to asin converter**, **convert upc to asin**, or **upc to asin bulk** for a manifest, EcomSource returns all known ASIN matches with variations and product attributes.
How UPC to ASIN lookup works
1. Enter the 12-digit UPC (or EAN) from packaging or your spreadsheet. 2. EcomSource searches 1.6B+ products and Amazon catalog links. 3. You receive ASIN(s), title, brand, rank, and images for listing decisions.
UPC to ASIN vs ASIN to UPC
Both directions use the same API. Use [/asin-to-upc](/asin-to-upc) when you start from Amazon; use this page when you start from supplier barcodes.
Frequently asked questions
Can one UPC map to multiple ASINs?
Yes. Bundles, multipacks, and regional offers can share a UPC. We return every ASIN match we know.
Bulk UPC to ASIN?
Yes. Use the bulk API on /docs to process entire supplier files.