# mpn

The mpn attribute is the part number a manufacturer uses to identify a product in its own catalogue, and it serves as the fallback identifier when an item has no GTIN. Unlike a GTIN it is only unique within one manufacturer, so it is meaningless to a channel unless the brand attribute is supplied alongside it.

- **Canonical URL:** https://www.feedlab.io/knowledge/attributes/mpn
- **Last reviewed:** 16 September 2026
- **Source:** feedlab knowledge base
- **Licence:** free to quote and cite with attribution to feedlab


## Specification

| Property | Value |
| --- | --- |
| Attribute | `mpn` |
| Plain name | Manufacturer Part Number |
| Data type | Text |
| Limit | 70 characters |
| Format | Alphanumeric, as published by the manufacturer, including any hyphens or letters it contains. It is not your internal SKU unless your company is also the manufacturer. Submitting a retailer-invented code is a common and damaging mistake, because it prevents the channel matching the item to the same product elsewhere. |


### Example values

- `GX-1140-BLK`
- `4056744`



### Support by channel

| Channel | Requirement | Field name | Notes |
| --- | --- | --- | --- |
| Google Shopping | Required in some cases | `mpn` | Required when the product has no GTIN. Must be paired with brand. |
| Meta | Optional | `mpn` |  |
| Microsoft Advertising | Required in some cases | `mpn` | Accepted in place of gtin, together with brand. |
| Pinterest | Optional | `mpn` |  |
| OpenAI | Optional | `mpn` | Manufacturer part number, accepted as an alternative identifier to gtin. |












## Frequently asked questions

### Is the MPN the same as my Shopify SKU?

Only if you manufacture the product yourself. A SKU is a code you invent for your own stock control; an MPN is the code the manufacturer publishes. Submitting your internal SKU as the MPN stops the channel matching your item to the same product sold elsewhere.

### What is the difference between GTIN and MPN?

A GTIN is globally unique and identifies the product no matter who sells it. An MPN is only unique within one manufacturer's catalogue, which is why it has to be submitted together with brand to mean anything.

### Do I need both gtin and mpn?

Not usually. Where a GTIN exists it is the stronger identifier and is generally sufficient. MPN matters when there is no GTIN, and supplying both does no harm when you have accurate values for each.




## Primary sources

- [Google: mpn attribute specification](https://support.google.com/merchants/answer/6324482)