eBay product identifiers: EAN, UPC, ISBN, MPN and brand explained for sellers

What are eBay product identifiers?

eBay product identifiers are the codes that tell eBay exactly which product you are selling: a barcode number such as an EAN, UPC or ISBN, and for many items the brand and the manufacturer part number (MPN). eBay describes them as unique codes created by the manufacturer that work like barcodes. When you enter one, eBay can match your listing to its product catalogue and fill in details such as the title, photo and item specifics for you.

Identifiers matter for two reasons. First, eBay says they are required when you list in most categories, so a missing one can stop a listing going live. Second, buyers filter search results by brand, model and other details, and eBay's UK Seller Centre says that when buyers apply filters, only listings with matching information are shown. A listing without the right identifiers can simply drop out of a filtered search.

Which identifier is which?

Most products carry more than one code. The table below shows what each one is and where you usually find it.

A GTIN identifies one exact version of a product. A red kettle and the same kettle in black usually have different barcodes, and so do a single pack and a pack of four. The MPN often stays the same across pack sizes, which is why eBay asks for brand and MPN together: the pair narrows the product down where a barcode alone might not exist.

EAN or UPC: does it matter which you enter?

Both are GTINs, so the question is which number the product actually carries. Enter the barcode exactly as it is printed, without spaces, in the identifier field the listing form shows for your category. A product made for the US market and sold in the UK may only carry a UPC, and a European import sold in the US may only carry an EAN. Either way it is still the correct GTIN for that item, so enter it rather than leaving the field empty.

When does eBay require product identifiers?

eBay's US Seller Center says product identifiers are required when you list in most categories, and it links a list of the categories that qualify. In the eBay APIs each category has a setting for each identifier type: disabled, enabled or required. Expect to be asked for a code mostly on new, branded, mass-produced goods, because those are the products that carry barcodes.

Requirements differ by category and by site, and they change. Rather than relying on a list you found elsewhere, check the listing form itself. When you choose a category, the form shows which identifier fields appear and which are marked as required. If you list through a bulk tool or an API, the category's settings tell the tool the same thing.

What should you enter when there is no identifier?

Some products truly have no barcode or part number: handmade goods, antiques, vintage items, custom-made pieces, unbranded generic stock and some bundles you put together yourself. For these, eBay's US Seller Center says to select 'Does not apply'. eBay's developer documentation gives the same English wording, 'Does not apply', for the UK, US, Canadian, Australian and Irish sites, with a translated version on sites in other languages.

Use it honestly. 'Does not apply' tells eBay and the buyer that no code exists for this product. It is not a way to skip a field you could not be bothered to look up. If the item is a branded, mass-produced product, it almost certainly has a barcode, and leaving it out costs you search visibility.

Brand for unbranded goods

When a product has no brand, do not put another company's name in the Brand field because the item is similar or compatible. A phone case that fits a well-known phone is not made by that phone's maker. Many categories offer an unbranded option in the Brand field; where they do, use it, and describe compatibility in the title and description instead. Naming a brand you do not sell can lead to a report from the rights owner, which our guide to eBay's counterfeit policy and brand names in listings covers in detail.

How to find the right product identifiers

The safest source of an identifier is the product in your hand or the packaging it ships in. When you do not hold the item, work through these sources in order and stop at the first reliable answer.

1. The packaging. The number under the barcode is the GTIN. Check it digit by digit.
2. The manufacturer. Brand websites, spec sheets and manuals often list the EAN or UPC and the MPN for each version.
3. Your supplier or wholesaler. Ask for the barcode and MPN for each line you buy. A good supplier sends them in the product data or on the invoice.
4. eBay's catalogue. Type the product name in the listing form and compare the suggested catalogue match with the item carefully: model, size, colour, pack size and edition.

eBay's US Seller Center warns that you should only use identifiers that match your product exactly, because a close but different model could mislead buyers. If no catalogue entry matches, you can choose the category yourself and build the listing without one.

Variations need their own codes

In a multi-variation listing, each option is a different product. A t-shirt in small, medium and large, or a charger in three cable lengths, will normally have one barcode per option. Enter the identifier against each variation, not just once for the whole listing. A single code shared across sizes tells eBay that every option is the same item.

Common mistakes with eBay product identifiers

Most identifier problems come from speed rather than bad intent. These are the ones to watch for.

• Guessing or reusing a code. Copying the EAN from a similar product, or using one code for a whole range, links your listing to the wrong catalogue entry. Buyers then see details that do not match what arrives.
• The wrong pack size. A single item and a multipack have different codes. Matching a single to a multipack's catalogue entry is a quick route to a not as described return.
• Accepting the catalogue's details without reading them. When eBay fills in item specifics from the catalogue, read them. If the catalogue says a colour or capacity your item does not have, you have picked the wrong product.
• 'Does not apply' on branded goods. It lets the listing through, but it removes the codes buyers and search filters use.
• Invented codes for your own products. If you sell goods under your own brand and want barcodes, they come from GS1, the organisation that issues GTINs. A number you made up, or one you cannot trace to your company, does not identify your product.

Do product identifiers help your listing rank?

eBay does not publish how much weight any single detail carries in search. It does say, on its page about product identifiers in the UK Seller Centre, that adding them helps buyers find your items more quickly, and that filtered searches show only listings with matching information. eBay's US Seller Center adds that the right catalogue entry helps buyers compare options and confirm they are getting the exact product, which can reduce return requests.

Identifiers also feed the item specifics that eBay names as part of a complete listing. Our guide to filling in eBay item specifics shows how the two work together, and what decides where your listing appears in eBay search covers the wider picture. The practical point is simple: a listing that is matched to the right product, with brand, MPN and GTIN filled in, can appear in every search and filter that applies to it.

Example: fixing identifiers on an existing listing

Example: suppose you sell a set of kitchen scales, listed a year ago with 'Does not apply' in the EAN field because you did not have the box to hand. Here is how you would put it right.

1. Find the barcode on a unit, the supplier's product sheet or the maker's website. Say it reads 5012345678900.
2. Open the listing in Seller Hub and choose to revise it.
3. Enter the EAN without spaces, then the brand and the MPN from the box or the manual.
4. If eBay offers a catalogue match, compare the model, colour and capacity with your item. Accept it only if every detail matches.
5. Read the item specifics after the match and correct anything the catalogue filled in wrongly.
6. Save the revision and check the live listing as a buyer would see it.

eBay's US Seller Center recommends going back to listings where you chose 'Does not apply' or had no identifier, and adding the code. If you have hundreds of listings, Seller Hub's bulk editing or a spreadsheet upload lets you add codes in batches instead of one at a time.

A quick product identifier checklist

Run through this before you publish any new listing, or when you review old ones.

• Is the GTIN the one printed on this exact version, pack size and colour?
• Are the brand and MPN filled in for branded goods?
• Does each variation carry its own code?
• Did you read the item specifics after a catalogue match?
• Is 'Does not apply' used only where no code truly exists?
• Is the Brand field free of other companies' names on unbranded or compatible items?

For the exact wording eBay accepts on each site when a code does not exist, see eBay's developer page on product identifier placeholder text, and for US listings the eBay Seller Center guide to product identifiers.