Canonical Tags – ASP Knowledge Base

A canonical tag (or rel="canonical" tag) is an HTML element that helps search engines understand which version of a webpage is the “main” or preferred version when there are multiple pages with similar or duplicate content.

It essentially prevents duplicate content issues and consolidates ranking signals to a single URL.

📝 Why is a Canonical Tag Important?

Prevents Duplicate Content Issues
When the same or very similar content exists on multiple URLs (e.g., /page and /page?ref=123), search engines may struggle to know which one to index. A canonical tag tells them which page is the authoritative version.
Consolidates SEO Value
Instead of splitting link equity, ranking signals, and traffic between multiple URLs, the canonical tag consolidates them to the main page.
Guides Search Engines
Helps search engines focus crawling and indexing on the correct page, improving your site's SEO performance.

🔧 How It Works

On a webpage, the canonical tag is placed in the <head> section of the HTML:

This tells search engines that https://www.example.com/preferred-page is the preferred URL, even if other versions of the page exist.

✅ Best Practices

Only use one canonical tag per page.
Ensure the canonical URL is accessible and not blocked by robots.txt.
Use canonical tags when there are duplicate or near-duplicate pages, including print versions, parameterized URLs, or session-specific URLs.
Always point the canonical to the most relevant and complete version of the content.

⚙️ How Canonical Tags are Enabled in Showoff

In Showoff, canonical tags can be automatically added to every page on your site:

Login to the back office for your website.
Navigate to Settings > SEO Settings.
Under the Meta Tags section, set "Apply Canonical Tags to Pages" to Yes.
Click Save.

This will enable self-referencing canonical tags on all pages of your site.

✏️ How to Override the Default Canonical URL for a Page

You can override the default canonical tag Showoff adds if you want to reference a different page as the preferred URL:

In the back office, navigate to the page, library, exhibitor, seminar, or speaker entry you wish to edit.
Click into the page or entry.
Click the Page / Entry Options button at the bottom of the page and navigate to the SEO tab.
In the Canonical URL box, enter the full URL of the original page you want to reference (e.g., https://www.asp.events/product/showoff).
Click Submit to close the popup, then click Save to save the page/entry.

The canonical tag for this page will now reference the URL you entered.

Using canonical tags correctly in Showoff ensures that search engines index the correct pages, consolidates SEO value, and protects your site from duplicate content issues.