初めてサイトを作成するときは、URL構造を選択する必要があります。www」を使うサイト（www.example.com のような）もあれば、使わないサイト（example.com のような）もあります。どちらがベストでしょうか？
この2つのURLフォーマットには技術的な違いがあり、多くの方からどちらの設定がSEOに適しているのかと質問を受けます。私たち自身の経験に基づいた簡単な答えと、私たち自身のサイトで使用しているものをお知らせします。
この投稿では、www URLとnon-www URLの違いを理解し、WordPressのSEO対策としてどちらが優れているかを説明する。
始める前にこのことをはっきりさせておこう。
平均的なユーザーや中小企業のオーナーにとって、wwwサイトと非wwwサイトのURLのどちらを選んでもまったくメリットはない。すべて個人の好みによる。
そう、この2つには技術的な違いがあり、投稿の後半で取り上げる。しかし、ほとんどの人にとっては、どちらでも問題ないだろう。
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文章によるチュートリアルをご希望の方は、このまま読み進めてください。
WWWと非WWWのSEO効果
www」は「ワールド・ワイド・ウェブ」の略で、多くのサイトのアドレスの先頭に付いている。しかし、「www」をすべて使わないサイトも多い。では、どちらが良いのでしょうか？
サイトのURLを選ぶ際には、wwwかnon-wwwかを選ぶことにSEO上のメリットはまったくないことを知っておくべきである。
重要なのは、一貫性を保つことです。WordPressサイトを立ち上げるときに選んだURLを使い続けることです。
言い換えれば、サイトのURLを変更してwww接頭辞を付けたり外したりしてはいけないということです。Googleのような検索エンジンは、wwwバージョンと非wwwバージョンを2つの異なるサイトとみなし、重複コンテンツの問題やランキングドロップにつながるからです。
しかし、All In One SEO（AIOSEO）プラグインを使用している場合、この問題は解消される。AIOSEOは、サイトヘッダのcanonical URLを自動的にwwwかnon-wwwのどちらかに設定し、Googleにあなたの個人的な好みを知らせます。
本当にしなければならないことは、これだけです。詳しくは、WordPressでAll In One SEOを設定する方法のガイドをご覧ください。
wwwとnon-wwwの違いについて疑問に思うかもしれない。
しかし、OptinMonster.comや WPForms.comなどの他のサイトでは、wwwを使用していません。
個人的な好みに過ぎない。
WWWと非WWWの技術的な違い
サイトURLの前にwwwを追加すると、ホスト名として機能します。これは、DNSの柔軟性、複数のサブドメインを使用する際にCookieを制限する機能など、いくつかの点で役に立ちます。
一方、非wwwドメインはネイキッドドメインとも呼ばれ、いくつかの技術的制限がある。その一例として、CDNプロバイダーは、障害が発生したサーバーからのトラフィックを、ネイキッドドメインの健全なサーバーにリダイレクトすることができません。
しかし、これらの技術的な違いは、あなたのサイトが毎日何百万ものページビューを受けている場合にしか感じられない。ほとんどのユーザーにとっては、何の違いもない。
WordPressのURLに関するエキスパートガイド
私たちは、この投稿があなたのサイトのURLのwwwとnon-wwwの間の混乱をクリアするのに役立ったことを願っています。WordPressのURLに関連する他のガイドもご覧ください：
- サイトのURLとは（重要な部分を初心者向けに解説）
- 初心者ガイド：ドメイン名とは何か、ドメインはどのように機能するのか？
- ドメイン名とホスティングサービスの違い（解説）
- WordPressにおけるSEOに適したURL構造とは？
- WordPressのURLにカテゴリーとサブカテゴリーを含める方法
- WordPressのURLから数字を削除する方法
- WordPressのURLから日付を削除する方法
- WordPressサイトのURLから/wordpress/を削除する方法
- WordPressサイトのURLを変更する方法（ステップバイステップ）
- WordPressサイト移転時にURLを簡単に更新する方法
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John Culotta
Great post, thank you. Question, I changed my sites over to a new host. They automatically changed the primary domain to the NON-www. For years they have had the www. Should I change it back? Will this mess up rankings of very old pages/posts? Thanks!
WPBeginner Support
If you set up redirects there should be no SEO change for your content.
管理者
Frances
Hello! Thanks for this great article. Also: Help! I’ve just changed my (relatively new) non-www site to www because the new Google Search Console was being finicky. Have I just screwed up my SEO completely? Do I really need to use redirects? Thanks so much. Best, Frances
WPBeginner Support
You have not screwed up your SEO, As long as your site has the canonical URL set through your SEO plugin you should be fine.
管理者
Rachel
I have used a few speed testing tools (GT Metrix, Pingdom, Google PS) and have entered my site with and without www. In each test my site received a better rating if I entered with www. Does the www actually impact speed or is it just a fluke?
WPBeginner Support
It would depend on the specific warnings or messages but most likely, your hosting provider is redirecting one of the URLs to the other causing the slowdown which would mean it is nothing to worry about.
管理者
Sean
What if I have both non-www and www version on my site? I previously use www version and it’s just okey. But, then I need also non-www version to verify with GA. Do I need redirect or it’s just fine. What about the penalty from Google for having same domain and subdomain?
WPBeginner Support
Google Analytics accepts www versions of sites, you would want to also ensure you set your preferred domain with Google.
管理者
Peter Iriogbe
My little addition to what the admin has answered you.
Having both non-www and www versions of your site without proper redirection can lead to duplicate content issues. It’s advisable to set up a 301 redirect from one version to the other to ensure consistency and avoid potential SEO penalties from search engines like Google.
Regarding penalties, having both versions (www and non-www) typically won’t result in a penalty, but it’s crucial to pick one as the preferred version and redirect the other. Google may treat them as separate entities, potentially impacting your search rankings. Choose either www or non-www, set up the redirect, and stick with your preferred version for better SEO.
ARPIT
I am Satisfied with this Article. Thanks for This type of Informative article. This article Answered my question.
WPBeginner Support
Glad you liked our article
管理者
Giacomo Lawrance
I changed mine just now to www from non www, will this damage my prexisting SEO? I already have both added to Webmasters and just changed my preference.
Thanks
WPBeginner Support
If you set up the canonical url then it should have minimal effect on your SEO.
管理者
Mintrx
When I enter URL directly of my website after clearing cache then store id is displayed along the url is it good for seo or not.
Here is the url:
example.com/?SID=1234
WPBeginner Support
They can be considered duplicate content when indexed, you can use Google’s URL parameters tool to avoid indexing those.
管理者
Ahmed
This is very informative for me
THANKS, WP Beginner,
WordPress users exist because you guys exist on internet, otherwise many people got distracted and ruined their business.
All best for you.
Jerry
What is the risk of changing fron non-www to www site ?
Sonam Sinha
thanks knowledge of url for seo
Phil
This would be important if the domain was used before buying it so its important to check any existing backlinks as there may be a benefit to www or non www depending which has the best metrics.
Khalid Abubakar
Hello, thanks for this great article I have successfully verified my side with www but to set www based version as my preferred one, I have to also verify the non-www version which fails after I add the tag and use other means of property verification but to no avail please help how I can achieve that… My site is
Muhammad Abbas
Hello, After setting my preferred domain to www version , my non www version is showing me robots.txt fetch error, while in www version i have no such error. i set 301 redirect from non www version to www version too.
But due to fetch error i cant see any indexing on non www version so what should i do with robots.txt fetch error for non www version of my site in search console.
Sir/Mam, i am eagirly waiting for the reply.
Thank you
Prakash
Hi,
I have a domain and Indexed like http://example.com/ (not www) and I added my site(same domain) in webmasters like http://www.example.com/ (www included) and I’m not getting any data like search and traffic info about the domain and nothing is happening there even after few weeks. is including www in webmasters for the domain is a problem for that? If its that how can I resolve it? Please give me some suggestions to overcome it
WPBeginner Support
Hi Prakash,
Yes, this is the problem. You need to add your non-www URL to webmaster tools.
管理者
Fabio
I have always wondered if not including the www in my url hurt SEO. Thanks for the article. Answered my question.
Strats
Hi guys, I have a site configured as non-www but the www results are better than the non-www ones. Should I switch to www?
Thanks!
WPBeginner Support
Hi,
If you are saying that the same website is indexed with both www and non-www URLs on the same domain name, then this is actually causing the duplicate content issue for Google. You would need to pick one and stick to it. You will also need to redirect users and search engines from the URL format that you drop.
管理者
Shahas
why https is not showing in your url…i assume you have SSL
david
If your site is on cloudflare, your address will become a www address
Nitin
My site is without www so is it good or bad ?
Cezar
Did you read the article? Does it matter www or no-WWW
Gustavo
i just launched a new wp site using a subdomain – new.example.com. One of my friends told me “not working as http://www.new.example.com“. So i checked and sure enough it wouldnt come up with the http://www., just “http://new.swirlspace.com”
So i went into the dashboard and changed it from http://new.example.com to http://www.example.com and as soon as i clicked “save changes” the site hasnt been able to be located anywhere, not even in wp dashboard.
not sure what to do to get i back online, and am just reading here to NOT change it after the initial time… so, any ideas? didnt backup since i had literally just finished it enough to announce it but was still working on adding many pages and features
WPBeginner Support
As we have mentioned above, the www is technically a subdomain itself. Some web hosts configure their servers in a way that automatically redirects users to non-www url when someone tries to access it with www. It seems your host doesn’t support this by default. This means when you changed URL from WordPress settings to http://www.new.example.com, then it started pointing to a subdomain that does not exist.
Here is how you can fix it. Connect to your website using FTP. Go to your the folder containing your WordPress files. Then go to /wp-content/themes/your-wordpress-theme/ folder and open the functions.php file. Add this code at the bottom of your functions.php file:
update_option( ‘siteurl’, ‘http://new.example.com’ );
update_option( ‘home’, ‘http://new.example.com’ );
Replace example.com with your own domain name. Save and upload the file back to your server. You should now be able to visit your website again.
管理者
VINOD KUMAR MAHINDROO
i have set my preferred domain with www but i had done my seo submission without www. is their any technical issue in serp.
WPBeginner Support
Yes, you will need to redirect users and search engines if they are not already being redirected.
管理者
Dustin Brohm
Here’s the question… just learning about SEO now. Before I setuo my new website I was putting my links all over the web as www. But then my new website shows up as non-www. Is google seeing this as 2 different websites? Are they not connecting the backlinks that have a www to the new website that is non-www?
If all my backlinks have a www, should I have my website person change my site to include www? This has been so confusing to me, so hopefully you can clear this up
Philip
Thanks for this tip – what is stupid is that Google gives you the opportunity to change the version in WebMaster Tools but they do not pass the domain authority from the old to the new…
I saw this option after noticing that no one uses www anymore in conversation and it seems more streamlined (less is more?) so I removed it. I ended up losing massive amounts of SEO juice and that could have ruined my business.
If Google is going to let you change, then why don’t they send the juice with the change!?!?!?!?!
Barry
Maybe you didn’t understand that www is a subdomain. When you switched, you technically changed your website’s “home”. You moved homes from the subdomain www to the “base” URL.
Google let’s you update your webmaster to tell them you’ve moved homes. They won’t “send the juice” to your new URL because you didn’t gain the rank using that address.
Effectively what you’re asking for is “tradeable” SEO. Not happening buddy
Brittney
Where can this be adjusted in yoast?
After making sure the redirect for www to non-www is in place, how long before webmaster tools will index the non-www version.
munish
confusing article not clearly said to which is best or which you preffer any way thanks
Mike
Thank you for the article, it answered a couple questions I have had. I am wondering if we set our preferred domain with Google WMT and set the same domain structure (non-www) in the wordpress settings does that alone define the canonical url? or should we also add a www to non-www 301 in our htaccess file? Thank you
sid
Seriously guys I would always choose www.
I decided to choose non www. because I liked it better but I am now having all kinds of problems later down the line.
For example.
My host offers cloudflare at a reduced rate. After spending 19 days on tech questions they now tell me that I cannot have a non www. domain running cloudflare through my control panel.
Instead I have to go to cloudflare and set up through them at an extra 15 dollars a month. :/
In changing over I have also had problems with my ssl certificate.
Non www. just isn’t as flexible at DNS.
This situation has got very messy the further I have progressed with it and multiple changes in htaccess, server setup and code have been needed to maintain proper operation. It isn’t worth it, it slows your site eventually through all the mess it creates.
Some of the problems I have encountered have been my own fault but I like you was stumbling blindly into stuff and just did what I was told. The free advice wasn’t always all that great and now I’m in a bit of a mess that could of been avoided if someone would of just warned me against the vanity of the non www.
When I was first reading this up everyone was like… Oh yeah use non www. if you like…Google doesn’t care. Well I now have all my webmaster tools set up, analytics, company stationary, business cards and all the rest done and my site won’t work properly with cloudflare. I think there may be a work around at cloudflare but to use a cname requires a business account at £200 a month.
I haven’t fully investigated that option because I can’t afford it before anyone asks.
Also, I get the redirect thing but it’s not the point? It’s all extra work that can be avoided and when your site gets big it adds up.
If your coming to this raw I would advise you to set up as www. If nothing else to save yourself months and months of reading and frustration.
You have been warned.
Eder Lugo
Dude. I’m running my domain without www under cloudflare with SSL for FREE, maybe is something about your server. You can see my site here:
Alin Pogan
Hi SID,
I use for several years the www. and no www. for my blogs and its no technical issue, the only problem is with the SSL certificate, you must release it with the www. version so it can work on both versions if you release it on non www. it will work only on your non www. site.
Hope it helps.
James Canning
Its so obvious that wpbeginner changes the date on their old posts to make old content look newer.
WPBeginner Support
We do not change dates. Actually we display the last updated date of a post and not the published date. We regularly update our old articles with new information. We update screenshots and make corrections when necessary.
管理者
Sacha
That’s very sensible.
Lonnie Jones
Yeah, I do the same thing. Every year I have to re-evaluate the “best” overall tools. If I find something important sooner than later then I just post it immediately.
Brandon Still`
Kudos to you guys for getting proper use out of your blog posts! Seriously folks, if you are a blogger and do not regularly revitalize and update old posts you are missing out on opportunities!!!! I see nothing wrong with updating older posts and displaying the recent updated date as opposed to the original post date.
Erick
I don’t think you really need to worry if you want to change the url from www to non www or vice versa at a later date. You don’t really need to be consistent anymore.
Wordpress 2.3 version has already improve on this and the only thing that is needed is to go to your wordpress settings->General and add or remove www. wordpress will automatically change all redirects by itself and you don’t have to do a thing, you don’t lose anything, no serp no likes nothing. The only thing you need to change is your webmaster tools url and thats it. Google might take a bit to index all your pages again but google its pretty fast.
In conclusion don’t worry if at a later date you want to change your url again. You can do it as many times as you want.
Gillian
Hi Erick, Was trying to find an answer to this question as I too would like to change my non-www to www domain and am thrilled to hear its really this easy! What about internal links and media stored on the site? Will that need to be redone? Also, will I need to update my settings with plugins like jetpack or will they automatically be informed?
Thanks so much for your comment, it really makes things so much easier for me as I’m very new to wordpress!
Gillian
heather arnita
So when you list your bog on other sites should you stay consistent and use www or non depending on your preference?
WPBeginner Support
You should stay consistent.
管理者
oescar
Well if u say so i wont doubt it :))
Praying to the Google Gods
Let’s just say a designer did change your site from www to non www. And your site dropped out of Google. It is advised to wait it out? Or change it back to www ??
WPBeginner Staff
Restore a copy of your website on www. and setup 301 redirects to your new non-www site.
Mark Davis
Thanks for post such a nice blog,
But my opinion is this,there are no difference between www or without www effects on seo traffic and ranking.
But technically www is standard way to represents url address so we should prefer with www url.
Vitaliy Kolos
Thing learned: naked URL
cyberarm
The one click install on most cpanels seem to omit the WWW in the setup. This has been my experience anyway.
ADOLF WITZELING
Interesting-I didn’t know that. Guess God’s in the detail…the Devil too…
Chris
Good article. I would just add the importance of doing a 301 redirect from one to the other, whichever way you choose. Thus way all links get resolved to the same domain (subdomain) instead of splitting backlinks.
Becca Heflin
Great information, but for small bloggers like myself, how do I find out which way I set it up initially? I honestly can’t remember!