A Subdomain is on the left of the foundation area (subdomain.area.com), whereas a subfolder is on the suitable of the foundation area (area.com/subfolder).

Let’s have a look at why SEOs argue over this subject and the way it actually works.
- Which is finest for web optimization?
- web optimization case research
- Causes for site visitors variations
SEOs have argued about this for so long as I can keep in mind. Many SEOs say that subfolders are higher for web optimization and demand on utilizing them. This can be a delusion that’s continued primarily based on some previous research.
Google has repeatedly stated both is high-quality.
Matt Cutts stated in 2012:
They’re roughly equal. I might mainly go along with whichever one is less complicated for you by way of configuration, your CMSs, all that form of stuff… Each are on the identical area total and so it’s actually a query of which one is less complicated for you. Whichever one makes you happier I’d go forward and do it that approach.
John Mueller stated in 2017:
Google websearch is ok with utilizing both subdomains or subdirectories. Making modifications to a web site’s URL construction tends to take a little bit of time to cool down in search so I like to recommend choosing a setup which you can preserve for longer.
I don’t suppose they might make it any clearer, however some SEOs nonetheless argue with Google. I really like John’s sarcastic response to those arguments.
What motive may Google probably need to be deceptive right here? “We’re working low on subdirectory-servers”? I knew this is able to set off some people, so I frolicked to prod people internally in regards to the actuality, and there’s nothing to cover right here.
— 🍌 John 🍌 (@JohnMu) January 24, 2018
It’s foolish to argue if a path is best on the left or the suitable. With out going into an excessive amount of technical element, these paths are digital in most fashionable techniques, which implies they don’t even level to precise areas on a server. You’ll be able to change their identify and their location within the URL construction in a matter of minutes.
Take into consideration that for a second; you may change a subdomain to be served as a subfolder rapidly and with out altering the rest, so why do individuals suppose it’s vital the place the trail is situated within the URL?
Many SEOs imagine that subdomains are handled as separate domains, however the fact is extra sophisticated. Anybody that comes with subdomains as a foremost a part of their web site will seemingly have them handled the very same as a subfolder can be handled. Nonetheless, if you happen to’re not treating the subdomains as a part of your foremost web site (learn as not connecting them with inner hyperlinks), then they could be handled as separate.
Somewhat historical past lesson. At one time, subdomains may get you further listings within the SERPs. As with many issues, SEOs abused this. Google closed this loophole in one of many previous area/host clustering updates.
Today, subdomains are prone to be handled as a part of the identical web site if they look like a part of the identical web site. Even sitelinks embody hyperlinks to subdomains.

Varied Disney subdomains which have proven as sitelinks. Information from Ahrefs’ Website Explorer.
I may give you numerous examples the place numerous subdomains present as sitelinks for the model—Github, LinkedIn, Google, Amazon, Microsoft, Yahoo, Netflix, Walmart, and many others.
Many case research present subfolders are higher than subdomains, however I haven’t seen one which wasn’t sophisticated by different modifications like further inner linking or migrating a number of properties into one.
Let’s have a look at a kind of case research and what I see. Utilizing Prime Pages 2.0 in Website Explorer, you may click on and drag on the historical past chart to see the distinction between any two dates. Within the case of point out.com, they migrated from a subdomain to a subdirectory in January 2016. I actually don’t see any distinction in that interval. It’s solely after that once they began including further content material that I see their site visitors rising.
And see that an equal web page for every web page that misplaced site visitors re-gained across the identical quantity of site visitors. The site visitors merely shifted to a brand new location, however there was no actual improve.

Right here’s one other enjoyable one. Github migrated from a subfolder (github.com/weblog) to a subdomain (weblog.github.com) after which to a totally totally different area (github.weblog). There was some flux in the course of the migration intervals, and there have been different modifications in the course of the transition, however it will be arduous to argue that anyone of those was higher than the others merely due to the URL.

A number of totally different points could trigger individuals to imagine that migrations had roughly impression than they actually did.
Short-term sign modifications
When pages are new or moved, Google could have them inherit some momentary alerts at a folder or web site stage as a result of they’re not fairly positive how a lot to crawl or the right way to rank them but. This will trigger some momentary fluctuations whereas they determine the modifications.
Monitoring or measuring points
This will present up in many various types. It is perhaps analytics setup points resembling possibly subdomain monitoring wasn’t arrange accurately. It may be timing points resembling measuring progress throughout a quick season, resembling vacation buying vs. a mean site visitors interval, or round a Google core replace. It could possibly solely be progress within the new folder. The primary factor is to just be sure you’re evaluating apples to apples.
Blocked or noindexed pages
If you happen to block pages from being crawled or noindex pages, alerts received’t consolidate accurately, which implies you’re prone to see a drop in the course of the migration. I’d suggest studying our robots.txt information to know this higher.
Redesign or platform change
A number of various things can change once you redesign a web site or change the platform. Expertise, pace, headings, URL modifications, and extra can all be totally different.
Inner linking modifications
I see this one typically in subdomain vs. subfolder case research: Going from a separate subdomain that wasn’t linked internally to a subfolder that’s linked to on each web page. In fact there’s going to be an uplift.
Eliminated or up to date content material
Altering content material means rating and site visitors are prone to change. If you happen to take away content material that had site visitors, then site visitors drops.
Closing ideas
Modifications introduce threat. You would possibly wish to suppose twice earlier than altering from a subdomain to a subfolder if the one motive you’re doing it’s for web optimization.
If in case you have a case the place you migrated and noticed an uplift with none of the modifications above, I’d like to see it. Ship me a message on Twitter, and I’ll examine, however I’m keen to guess there’s a change that may clarify the distinction.