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Identifiers

What is ASIN?

Also known as Amazon Standard Identification Number

An ASIN is the ten-character alphanumeric code Amazon assigns to every product in its catalogue. It identifies the product page, not your particular offer on it.

Why it matters

Multiple sellers can offer the same ASIN, competing for the Buy Box on a shared product page. Creating a duplicate ASIN for a product that already exists is a policy violation and usually gets merged or suppressed.

For books, the ASIN is the ISBN. For everything else Amazon generates it when the product is first listed.

Related

Terms that come up alongside this one

SKU
A SKU is your own internal code for a specific product variant. Unlike an ASIN or GTIN, it is chosen by you and does not need to be unique outside your own catalogue.
GTIN
A GTIN is a globally unique product barcode number. UPC (12 digits, North America) and EAN (13 digits, Europe) are both types of GTIN, and most marketplaces require one to create a listing.
Buy Box
The Buy Box is the Add to Cart panel on an Amazon product page shared by multiple sellers. The seller who wins it receives the overwhelming majority of that page's sales.

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