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A Guide to Canonical Redirects: Mastering Canonical Tags and 301 Redirects for SEO

Canonical Redirects Learn About Canonical Tags and 301 Redirects

FortDealing with duplicate content can be a real headache, especially if you run an e-commerce store.

It confuses search engines and can drop your page rankings. Managing this is crucial to keep a strong online presence. This guide will help you understand and master canonical tags and 301 redirects. These tools are key to fixing duplicate content and boosting your site’s SEO.

We’ll break down what canonical redirects are. We’ll show you how to use canonical tags and when to implement 301 redirects. By the end, you’ll have clear, actionable steps to improve your site’s SEO.

Ready to dive in? Let’s get started!

What are Canonical Tag and Canonical Redirect?

A canonical tag is an HTML element that tells search engines which version of a webpage is the preferred one. This helps avoid confusion when there are multiple pages with similar or duplicate content.

By using a canonical tag, you ensure that search engines focus on the main version of the page. This consolidates SEO value and improves your rankings.


<link rel="canonical" href="https://example.com/preferred-page/" />

This tag is especially useful for websites with multiple URL variations, like e-commerce sites with sorting options.

What is a Canonical Redirect?

“Canonical redirect” isn’t an official term, but it’s often used to describe how canonical tags guide search engines to the preferred URL. By using a canonical tag, you ensure that search engines focus on the main URL, consolidating all SEO value to that page. This helps improve your search rankings and avoid duplicate content issues.

What is a 301 Redirect?

A 301 redirect is an HTTP status code that tells browsers and search engines that a webpage has permanently moved to a new URL. It’s like putting up a sign that says, “We’ve moved! Go here instead.”

When you use a 301 redirect, any traffic or SEO value from the old URL is transferred to the new URL. This ensures that users and search engines are directed to the correct page, maintaining your site’s search rankings.

Example: If you move a page from https://example.com/old-page to https://example.com/new-page, a 301 redirect ensures everyone goes to the new page, and the new page gets all the SEO benefits from the old one.

Understanding Canonical URLs and Canonicalization

A canonical URL is the main or preferred version of a webpage that you want search engines to index.

Canonicalization is the process of choosing this preferred URL when multiple URLs have similar or identical content.

Why is Canonicalization Important?

Without canonicalization, search engines might see different URLs as separate pages, splitting SEO value and lowering your search rankings. This can happen due to URL parameters, session IDs, or duplicate content.

Here is an example:

Imagine you have a product page for “blue shirts” on your e-commerce site. Customers can reach this page through different URLs based on sorting options or tracking parameters:

  • https://example.com/blue-shirts?sort=price
  • https://example.com/blue-shirts?utm_source=newsletter
  • https://example.com/blue-shirts

Without a canonical URL, search engines might see these as separate pages and split their SEO value. To fix this, you set the canonical URL to the main version:

<link rel="canonical" href="https://example.com/blue-shirts" />

This tells search engines to focus on the main URL, consolidating all SEO benefits and improving your search rankings. Canonicalization ensures all SEO efforts are directed to one URL, enhancing your site’s performance and avoiding penalties for duplicate content.

Canonical vs. 301 Redirect

While both canonical tags and 301 redirects address duplicate content issues, they serve different purposes and function differently.

When to Use a Canonical Tag

Canonical tags are ideal when you have multiple URLs with similar content and want to consolidate their SEO value without removing any pages. They suggest to search engines which version of a page should be considered the main one. This is especially useful for:

  • Pages with UTM Parameters: URLs used for tracking campaigns.
  • Products in Multiple Categories: A single product listed under various categories.
  • Dynamic URLs: Pages generated with sorting or filtering options.

<link rel=”canonical” href=”https://example.com/page” />

This tells search engines to focus on the main URL while keeping all versions accessible to users.

When to Use a 301 Redirect

A 301 redirect is best when you permanently move a page to a new URL. This method directs all traffic from the old URL to the new one, transferring the SEO value to the new page. It’s particularly useful for:

  • Site Migrations: Moving to a new domain.
  • Page Deletions: Redirecting an old page to a relevant new page.
  • Consolidating URLs: Ensuring all variations of a URL direct to a single, preferred URL.
Redirect 301 /old-page https://example.com/new-page/ 

This ensures users and search engines are directed to the new URL, passing on all SEO benefits from the old one.

Key Differences

  • Canonical Tags: Allow all versions of a URL to remain accessible while suggesting the preferred one to search engines. Added in the <head> section of a page.
  • 301 Redirects: Permanently move a URL, ensuring users and search engines are directed to the new location. Implemented server-side.

Using these tools correctly helps maintain your site’s SEO integrity and ensures a better user experience by addressing duplicate content issues effectively​​​​​​.

How to Implement Canonical Tags

Implementing canonical tags is straightforward and can greatly improve your SEO by consolidating duplicate content. Here’s how you can do it:

Step-by-Step Guide to Implementing Canonical Tag

Here is how to implement a canonical tag:

1. Identify the Preferred URL

Determine which version of the URL you want to be the primary one. This should be the cleanest, most user-friendly version without any tracking parameters or session IDs.

2. Add the Canonical Tag to the <head> Section

Insert the canonical tag in the HTML <head> section of each duplicate page, pointing to the preferred URL.


On https://example.com/page-a, add the following canonical tag if the preferred page is https://example.com/page-b:

<link rel="canonical" href="https://example.com/page-b" />

For https://example.com/page-c, add the following canonical tag if the preferred page is https://example.com/page-b:

<link rel="canonical" href="https://example.com/page-b" />

On the preferred page https://example.com/page-b, add a self-referencing canonical tag:

<link rel="canonical" href="https://example.com/page-b" />

3. Ensure Self-Referencing Canonical Tags

Each page, including the preferred one, should have a self-referencing canonical tag to avoid any confusion.

Implement Canonical Tags Programmatically

For large websites, automate the process using your Content Management System (CMS) or server-side scripting to generate canonical tags dynamically.

  • WordPress: Use plugins like Yoast SEO to manage canonical tags effortlessly. The plugin allows you to set a canonical URL for each post or page.
  • Shopify: Shopify automatically adds self-referencing canonical tags, but you can customize them if needed using their Liquid templates.
  • Magento: Magento provides options in the admin panel to set canonical tags for products and categories.
  • Server-Side Example: If you use a custom CMS or server-side scripting, you can programmatically insert canonical tags. For instance, in PHP:
<?php // 
Determine the preferred URL
$canonical_url = "https://example.com/page-b"; // 
Output the canonical tag in the head section
echo '
<link rel="canonical" href="' . $canonical_url . '" />
'; ?>

Verify the Implementation

Use tools like Google Search Console to check if your canonical tags are correctly implemented. The URL Inspection tool can show if Google recognizes the canonical URL you specified.

Regular Audits

Periodically audit your site using SEO tools like Screaming Frog, Ahrefs, or SEMrush to ensure all pages have the correct canonical tags and there are no conflicting signals.

Practical Examples

  • E-commerce Sites: If a product can be sorted by price or popularity, set the main product page as the canonical URL.
    <link rel="canonical" href="https://example.com/product" />
  • Content Sites: If a blog post is accessed through multiple URLs due to tracking parameters, set the main blog post URL as the canonical URL.
    <link rel="canonical" href="https://example.com/blog-post" />

How to Implement 301 Redirects

how to implement redirect

Implementing 301 redirects ensures that users and search engines are directed to the correct URL when a page is moved or deleted. Here’s how you can set up 301 redirects:

Step-by-Step Guide to Implementing 301 Redirect

Let’s check the steps to implement a 301 redirect:

1. Identify the Old and New URLs

Determine which URL is being moved (old URL) and where it should be redirected (new URL).

2. Update .htaccess File (For Apache Servers)

Access your website’s root directory and locate the `.htaccess` file. Open it for editing.


Redirect 301 /old-page https://example.com/new-page

This line tells the server to redirect https://example.com/old-page to https://example.com/new-page permanently.

3. Set Up 301 Redirects in Nginx

If you are using Nginx, you need to edit the server configuration file, usually located at /etc/nginx/sites-available/default or similar.


server {
    location /old-page {
        return 301 https://example.com/new-page;

4. Use a CMS Plugin

  • WordPress: Use plugins like Redirection or Yoast SEO to manage 301 redirects easily.
  • Redirection Plugin: Go to Tools > Redirection, and enter the source URL (old URL) and target URL (new URL).
  • Yoast SEO: Go to SEO > Redirects, and set up the redirect from the old URL to the new URL.

Implement 301 Redirects Programmatically

For dynamic websites or custom CMS, you might need to implement 301 redirects programmatically.

PHP Example:

// Redirect old page to new page
header("Location: https://example.com/new-page", true, 301);

JavaScript Example:

<script type="text/javascript">
window.location.href = "https://example.com/new-page";

Check and Verify Redirects

Use tools like Google Search Console’s URL Inspection Tool or third-party services like Screaming Frog, Ahrefs, or SEMrush to verify that your 301 redirects are set up correctly and working as expected.

Regular Audits

Conduct regular audits of your redirects to ensure they are functioning properly and to identify any potential issues such as redirect chains or loops.

Practical Examples


  • Site Migration: If you are moving your site from https://oldsite.com to https://newsite.com, you would set up 301 redirects for each page.
    Redirect 301 /about https://newsite.com/about
    Redirect 301 /contact https://newsite.com/contact
  • Page Deletion: If you delete a page and want to redirect users to a relevant new page.
    Redirect 301 /old-blog-post https://example.com/new-blog-post

By following these steps, you can effectively implement 301 redirects to ensure a smooth transition for users and maintain your site’s SEO integrity.

Best Practices for Using Canonical Tags and 301 Redirects

Canonical tags and 301 redirects are essential tools in your SEO toolkit. When used correctly, they help manage duplicate content, consolidate link equity, and guide search engines to the right pages. Here’s how to make the most out of these tools:

Best Practices for Canonical Tags

  1. Use Absolute URLs: Always use the full URL in your canonical tags. This avoids confusion and ensures that search engines know exactly which URL is the preferred one.
    <link rel="canonical" href="https://example.com/page" />
  2. Self-Referencing Canonical Tags: Each page should have a self-referencing canonical tag. This makes it clear which version of the page is the main one.
    <link rel="canonical" href="https://example.com/page" />
  3. Consistency is Key: Ensure all duplicate pages point to the same preferred URL. Mixed signals can confuse search engines and dilute your SEO efforts.
  4. One Canonical Tag Per Page: Stick to one canonical tag per page to avoid sending conflicting messages to search engines.
  5. Automate with CMS Tools: Use plugins to automate the process:
    • WordPress: Yoast SEO plugin can manage canonical tags for you.
    • Shopify: Shopify automatically adds self-referencing canonical tags, but you can tweak them if needed.
  6. Regular Audits: Regularly check your canonical tags with tools like Google Search Console, Screaming Frog, or Ahrefs. This ensures they are correctly set up and not conflicting.

Best Practices for 301 Redirects


  1. Use for Permanent Changes: Only use 301 redirects for permanent URL changes. This way, the SEO value is passed to the new URL.
  2. Avoid Redirect Chains: Minimize the number of redirects in a chain to one. Too many redirects can slow down your site and confuse users and search engines.
  3. Update Internal Links: Once you set up a 301 redirect, update all internal links to point directly to the new URL. This reduces server load and enhances user experience.
  4. Monitor and Verify Redirects: Use tools like Google Search Console, Screaming Frog, or Ahrefs to keep an eye on your redirects. Check for broken redirects or loops that can hurt your SEO.
  5. Relevance Matters: Redirect old URLs to new URLs with similar or related content. Redirecting to irrelevant pages can confuse users and harm your SEO.
  6. Server-Side Implementation: Implement 301 redirects at the server level for better performance. For example, use the .htaccess file for Apache servers:
    Redirect 301 /old-page https://example.com/new-page
  7. Document Your Redirects: Keep a log of all 301 redirects you set up. This helps track changes and troubleshoot any issues that may come up.

By following these best practices, you can effectively use canonical tags and 301 redirects to manage duplicate content, boost your site’s SEO, and ensure a smooth user experience. This helps search engines recognize the preferred versions of your pages and maintain the SEO value you’ve worked hard to build.


Congratulations! You now have a basic understanding of canonical redirects. By implementing canonical tags and 301 redirects, you can significantly improve your SEO and manage duplicate content effectively.


  • Use canonical tags: When you have multiple URLs with similar content and want to consolidate their SEO value without removing any pages.
  • Use 301 redirects: When you permanently move a page to a new URL and want to ensure all traffic and SEO value go to the new location.

If you want to solidify your backlink profile and improve your SEO, check out Outreach Monks’ guest posting services. We specialize in high-quality link building to boost your site’s authority and search rankings.

Frequently Asked Questions

Can I use a canonical tag on a 404 page?

No, canonical tags should only be used on valid pages.

Do canonical tags pass link equity, like 301 redirects?

Yes, canonical tags help consolidate link equity to the preferred URL.

Can I use canonical tags for pagination?

Yes, but it's better to use rel=prev and rel=next for paginated content.

Do I need to remove URL parameters in canonical tags?

Yes, always point canonical tags to the clean, main version of the URL without parameters.

How do I handle HTTPS and HTTP versions of my site?

Use 301 redirects to permanently move HTTP traffic to HTTPS, and set canonical tags to the HTTPS versions.

Ekta Chauhan

Ekta Chauhan

Ekta is a seasoned link builder at Outreach Monks. She uses her digital marketing expertise to deliver great results. Specializing in the SaaS niche, she excels at crafting and executing effective link-building strategies. Ekta also shares her insights by writing engaging and informative articles regularly. On the personal side, despite her calm and quiet nature, don't be fooled—Ekta's creativity means she’s probably plotting to take over the world. When she's not working, she enjoys exploring new hobbies, from painting to trying out new recipes in her kitchen.


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