---
title: "Google Merchant Center (GMC): definition | Product Metrics"
description: "Google Merchant Center (GMC) is the free Google tool that holds a shop’s product data, so its products can show on Google Shopping and across Google."
canonical: "https://www.productmetrics.io/glossary/google-merchant-center"
pageType: article
language: en
publisher: "Product Metrics"
author: "Berend Vrakking"
datePublished: 2026-10-07
dateModified: 2026-10-07
---

> Content index: https://www.productmetrics.io/llms.txt

# Google Merchant Center

Google Merchant Center is a free Google tool where a shop uploads and manages its product data, so its products can appear on Google Shopping and across Google.

## Example

One product as Merchant Center sees it:

| Attribute | Value |
| --- | --- |
| id | TR2-BLK-42 |
| title | Trail Runner 2, black, size 42 |
| price | €89.99 |
| custom_label_0 | stars |

Each row is one attribute of one product, which your campaigns use to choose what to advertise. Illustrative data.

## For one product, and for an account

Merchant Center holds the products; Google Ads runs the campaigns that advertise them. Setup and the rest live in the advertiser’s guide under Keep reading.

Shopping ads are served one product at a time, so each product’s data, including its custom labels, decides how you can steer priority between products. Product Metrics adds one of those labels: each product’s segment, written through a supplemental feed.

## Common mistake

Setting up the account, uploading the feed and walking away. Prices, stock and labels keep changing, and data that stands still ends up describing a product that no longer exists in that form.

## Questions

### What does GMC stand for?

GMC stands for Google Merchant Center, often shortened to Merchant Center. It is a separate account from Google Ads, and the two are linked.

### Is a product feed the same as Google Merchant Center?

No. A product feed is the data about your products. Merchant Center is the tool that receives that data and makes the products available to your Google Ads campaigns.

## Sources

- [Google Merchant Center Help: About Merchant Center](https://support.google.com/merchants/answer/188924)

## Keep reading

- [What is Google Merchant Center? An advertiser’s guide](https://www.productmetrics.io/blog/what-is-google-merchant-center): The full guide: setup, data sources, custom labels, price benchmarks and how labels reach your campaigns.
- [Product feed](https://www.productmetrics.io/glossary/product-feed): The product data you send to Merchant Center.
- [Custom labels](https://www.productmetrics.io/glossary/custom-labels): Five attributes you fill with your own values to group products.
- [Product Segmentation](https://www.productmetrics.io/product-segmentation): See each product in one of six segments, by volume and return.
- [Performance Max](https://www.productmetrics.io/performance-max): See spend and return per product segment and category.
- [Optimise Google Shopping ads](https://www.productmetrics.io/blog/optimize-google-shopping-ads): Seven steps: the feed first, then each product against its break-even.

---

Written by Berend Vrakking, founder of Product Metrics. Last updated 2026-10-07.

HTML version: https://www.productmetrics.io/glossary/google-merchant-center