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What is a subdomain?

A subdomain is a part of your website URL that comes before your main domain and helps organize content into separate sections.

For example:

• Main domain: example.com
• Subdomain: blog.example.com

Even though the subdomain is linked to the main domain, search engines and web browsers treat it as a distinct site with its own content and structure.

How do subdomains work?

Subdomains function as separate websites within a single domain. You can assign unique content, layouts, and functionalities to them while keeping them connected to the primary domain.

They are particularly useful when a website needs to host specialized content or services that don’t fit neatly into the main site’s structure.

Benefits of using a subdomain

Adding a subdomain to your website comes with several advantages, depending on your business needs. Here are some key benefits:

1. Better content organization

A subdomain allows you to separate different parts of your website, making it easier for users to navigate and find relevant content.

For example:

• support.example.com for customer support
• academy.example.com for educational courses

2. Customization & branding flexibility

Subdomains can have different designs, content structures, and even CMS platforms from your main site. This is useful for businesses with multiple brands or services under one umbrella.

For example:

• A SaaS company might use app.example.com for its product dashboard.
• A restaurant chain might use order.example.com for its online ordering system.

3. Improved website performance

Keeping resource-intensive sections (like learning platforms or large media libraries) on a subdomain can reduce the load on your main website, improving speed and reliability.

4. Enhanced user experience

Subdomains make it easier to provide a tailored experience for different user segments. For example:

• us.example.com and uk.example.com can serve country-specific content.
• members.example.com can provide exclusive access to subscribers.

5. Separate SEO & marketing strategies

A subdomain lets you target specific keywords, audiences, or regions without affecting your main website’s SEO strategy. You can also run different paid ad campaigns for the subdomain.

For example:

• blog.example.com can focus on content marketing and SEO.
• events.example.com can highlight upcoming company events and webinars.

6. Easier testing & development

Developers use subdomains to create staging environments where they can test new features before launching them on the main site.

For example:

• beta.example.com for testing new product versions.
• dev.example.com for internal development.

Subdomain vs. Subdirectory: What’s the difference?

Many wonder whether they should use a subdomain or a subdirectory for different sections of the site. While both options organize content, they serve distinct purposes. A subdomain is essentially a separate branch of your main website, functioning as an independent entity. For example, blog.example.com is a subdomain that can operate on different platforms or have a unique design while still being part of the main brand.

On the other hand, a subdirectory (or subfolder) is a section within your main domain, following the structure of example.com/blog or example.com/store. Unlike subdomains, subdirectories inherit the authority and SEO benefits of the main domain since all content remains under one roof. While subdomains are useful for separating different types of content or services, subdirectories are often preferred for maintaining strong SEO continuity across a site.

To sum it up:

• Use a subdomain if you want a completely separate section with its own branding, structure, and content.
• Use a subdirectory if you want your content to benefit from your main site’s SEO strength.

Now that we’ve explored the difference between subdomains and subdirectories, it’s time for the million-dollar question: How do subdomains impact SEO?

So, how do subdomains affect SEO anyway?

The impact of subdomains on SEO has been a long-standing debate in the digital marketing world, and even Google’s own experts have weighed in on the discussion. Rather than taking a definitive stance, Google has provided insights that suggest subdomains are neither inherently good nor bad for SEO—but they do require careful implementation.

Google’s John Mueller has addressed this topic multiple times. In one statement, he clarified that Google treats subdomains separately from the main domain, meaning they need to be crawled and indexed individually. He explained in Google Search Central:

This suggests that while Google does recognize subdomains as part of a larger site, they don’t automatically inherit authority from the main domain. Instead, each subdomain must build its own SEO strength over time.

Additionally, Google has repeatedly stated that using a subdomain vs. a subdirectory won’t make or break your rankings - it all depends on how the content is structured and whether it provides value to users. However, some SEO professionals argue that consolidating content under one domain (via subdirectories) helps maintain authority, while others successfully use subdomains to separate different types of content, such as blogs, eCommerce stores, or support portals.

Ultimately, Google’s view comes down to this: subdomains can rank just as well as subdirectories if optimized properly. However, they require separate SEO efforts, including link-building, keyword optimization, and tracking in Google Search Console.

If you use a subdomain, follow these best practices:

1. Verify your subdomain in Google Search Console.
2. Submit a sitemap for the subdomain.
3. Build backlinks to the subdomain for better authority.
4. Ensure internal linking between the main domain and subdomain.
5. Monitor performance separately in Google Analytics.

So, while subdomains aren’t inherently bad for SEO, they come with additional considerations. The key is to use them strategically and ensure they serve a clear purpose for your client’s site.

How to add a subdomain to your Duda website?

Adding a subdomain in Duda is simple. Follow these steps:

Step 1: Log into your Duda account

Go to your Duda dashboard and navigate to SEO Settings.

Step 2: Change your URL

• Find Site Domains in the bottom-left menu.
• Click Change URL and enter the desired subdomain (e.g., blog.yourwebsite.com).

Step 3: Update your DNS settings

• Go to the DNS provider.
• Add a CNAME record pointing the subdomain to the Duda site.
• Unlike a main domain, a subdomain only requires a CNAME record.

Step 4: Save and verify

Once the DNS settings update (which can take a few hours), the subdomain will be live!

Final note 

Subdomains can be a powerful tool for organizing a website, creating separate content experiences, and expanding the business. However, they require separate SEO efforts since Google treats them as independent websites.

Before deciding between a subdomain or subdirectory, consider your client’s goals:

• If you want content to benefit from the main site’s SEO, use a subdirectory.
• If you need a distinct website section, use a subdomain.

If you’re using Duda, setting up a subdomain is quick and easy. Just make sure to configure your DNS correctly, and you’ll be ready to go!