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 to users but will improve Google's understanding about the product.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.link
or mobile_link
attributes, we recommend using the canonical_link
attribute. For example, let’s say you sell couches that vary by color and size. You may submit one URL for each variant’s landing page using the link
attribute. You may then use the canonical_link
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 canonical_link
attribute to indicate which URL you’d prefer Google 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 canonical URL in your product landing page markup you do not need to provide the 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 we understand 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 feeds | 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 on the Diagnostics page of your Merchant Center account.
- Make sure that your canonical link meets the requirements for canonical URLs. Learn more about requirements for canonical URLs
- Start with preferably
https
orhttp
and 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
canonical_link
attribute for your product. If you provide multiple canonical_link 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 canonical 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 your canonical 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 canonical link to your landing page should have no pre-selected variants.
- Don’t use tracking parameters in canonical 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 canonical 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 | Dress |
color |
blue |
size |
small |
link |
https://example.com/dress/blue-small |
canonical_link |
https://example.com/dress |
Product | Dress |
color |
green |
size |
small |
link |
https://example.com/dress/green-small |
canonical_link |
https://example.com/dress |
Product | Dress |
color |
blue |
size |
large |
link |
https://example.com/dress/blue-large |
canonical_link |
https://example.com/dress |
Product | Dress |
color |
green |
size |
large |
link |
https://example.com/dress/green-large |
canonical_link |
https://example.com/dress |