> For the complete documentation index, see [llms.txt](https://docs.hubyte.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.hubyte.de/seo-ultimate/english-documentation/canonical.md).
# Canonical URLs
A **canonical URL** tells Google which URL is the "correct" (canonical) version of a page. This helps against duplicate content, e.g. for products in multiple categories or filter/pagination URLs.
SEO Ultimate lets you set an **individual canonical URL per product and per category**. If no custom value is set, the Shopware default (the page's SEO URL) stays active.
## Product canonical
1. Open the product → **SEO** tab.
2. In the **SEO canonical** card enter a full URL in the *Custom canonical tag* field.
3. Save.
Below the field you see a **live preview** of the rendered tag:
```html
```
If the field is empty, the preview shows the **Shopware default** (the product SEO URL).
> **Variants:** the value can be inherited from the main product or overridden per variant.
## Category canonical
1. Open the category → **SEO** tab.
2. In the **SEO canonical** card enter a full URL.
3. Save.
Here, too, a live preview with the Shopware default as a fallback is shown.
## Output in the storefront
The canonical tag is rendered automatically in the `` of the respective page:
```html
```
* If a **custom value** is set, it is used.
* Otherwise the **default SEO URL** from Shopware applies.
> **Tip:** always enter the **full URL** including `https://` and the domain.