Submit the Google Search index [canonical_link] attribute for products that are eligible for free product listings on Google and use it to ensure your products are associated with the correct URL in Google's Search index. The URL in this attribute is not served, but will improve Google's understanding about the product.
The Google Search index [canonical_link] attribute works similarly to the "canonical URL" markup tag, and allows you to influence which URLs Google uses for your products in our web search index.
If you use tracking or variant selection parameters in your link [link] or mobile link [mobile_link] attributes, we recommend using the Google Search index attribute.
[link] attribute. You may then use the Google Search index attribute to direct all variants of the product to the landing page of the base product, which has no variant parameters (such as size or color) pre-selected. URLs discovered by Google’s web search crawler typically link to a single base product without any pre-selected parameters.When to use
Optional for each product
Use the Google Search index [canonical_link] attribute to indicate which URL you want Google to use when matching your products' landing pages with the Search index. If you do not indicate a canonical link, Google will crawl your site and set whichever URL it considers to be the most representative as the canonical link.
If you already provide a Google Search index URL in your product landing page markup you do not need to provide the Google Search index [canonical_link] attribute. If you provide a value for both and those values don’t match, Google will select a link based on internal signals.
You can also set a noindex tag in the html of your landing page if you want to prevent your page from being crawled and added to the web index.
Format
Follow these formatting guidelines to make sure Google understands the data you're submitting.
| Type | URL (including http or https), ASCII characters only, and RFC 3986 compliant |
|---|---|
| Limits | 1 – 2,000 characters |
| Repeated field | No |
| File format | Example entry |
| Text (TSV) | http://www.example.com/writing/google-pens |
| XML (Feeds) | <g:canonical_link>http://www.example.com/writing/google-pens</g:canonical_link> |
Minimum requirements
These are the requirements you'll need to meet to show your product. If you don't follow these requirements, we'll disapprove your product and let you know in the Diagnostics page in your Merchant Center account.
- Make sure that your attribute value meets the requirements for canonical URLs. Learn more about requirements for Google Search index URLs
- Start with
httpsorhttpand comply with RFC 3986. For example:https://www.example.com/writing/fiji-pens. - Use your verified domain name. Make sure to use the domain name that you verified (during account setup or through the Website Verification tab). Learn more about how to verify and claim your domain name
- Make sure your canonical URLs can be crawled by Google. For example, ensure your robots.txt file is configured correctly. Otherwise, your landing page will not appear in the search results. Learn more about robots.txt files
- Replace any symbols or spaces with URL encoded entities. For example, if your URL contains an
&, then replace it with%26. - Submit only one Google Search index attribute for your product. If you provide multiple Google Search index attributes for the same item, only one of them will be applied.
Best practices
These best practices can help you go beyond the basic requirements to optimize your product data for performance.
- Use a stable Google Search index URL. The URL that you include shouldn’t change unless your landing page moves. Don’t use URLs with timestamps or parts that could change each time you submit your product data.
- Whenever you change your URL, your landing page will need to be evaluated and crawled. This process could cause unnecessary load on your servers.
- Use a landing page that doesn’t include parameters in its URL as the destination for this link. If parameters are set, Google may crawl the URL inefficiently and exclude the URL that you want to include.
- Don’t use pre-selected variants. The Google Search index link to your landing page should have no pre-selected variants.
- Don’t use tracking parameters in Google Search index links. Tracking parameters may be removed by Google’s web crawler and will make matching of your products against the search index less accurate.
- Don’t use the ads redirect attribute for your Google Search index links. Redirects may not be crawled by Google’s web crawler and your URL may not be included in search results.
Examples
Variants
[canonical_link] attribute to direct all variants of the product to a single base product, which has no variants pre-selected, as in the examples below:| Product data for a small blue dress | |
| Attribute | Value |
Color [color] |
Blue |
Size [size] |
S |
Link [link] |
https://example.com/dress/blue-small |
Google Search index [canonical_link] |
https://example.com/dress |
| Product data for a large green dress | |
| Attribute | Value |
Color [color] |
Green |
Size [size] |
L |
Link [link] |
https://example.com/dress/green-large |
Google Search index [canonical_link] |
https://example.com/dress |