This page is a translated version of the page Cookie statement and the translation is 26% complete.
Outdated translations are marked like this.

Please note that the original version of this document is the English version on the Foundation Wiki. In the event of any differences in content, meaning, or interpretation between this document and the Foundation Wiki document, the English version on the Foundation Wiki takes precedence.





「セッションクッキー」とは、Webブラウザやモバイルアプリケーションを閉じると失効するCookieのことです。「永続的なクッキー」とは、ブラウザまたはモバイルアプリケーションを閉じても失効しないCookieのことです。 永続的なクッキーは、Wikimediaサイトが設定した期間(または手動削除)によって失効します。ウィキペディアでもっと知る

あなたはブラウザの設定でCookieを削除または無効にすることができます。 Cookieオプションの詳細については、このCookieステートメントのSection 3を参照してください。


2. Cookieがどのように使用されるか




These cookies help the Wikimedia Sites work and are essential in order to enable you to move around the Wikimedia site and use their features. These cookies are useful for remembering your username in the login field, maintaining your session and remembering previous actions, keeping you logged in (if selected), and more.

Here are a few examples:

Name Expires Category What does it do?

{$wgCookiePrefix}* Token

365 days, if the user chooses ‘Keep me logged in’. Otherwise omitted. Functionality Provides ‘Keep me logged in’ functionality.
{$wgCookiePrefix}* UserID,
{$wgCookiePrefix}* UserName
365 days, if the user chooses ‘Keep me logged in’. Otherwise 30 days. Functionality Helps identify you to the wiki, and keeps you logged in.
loginnotify_prevlogins 180 days Functionality Verifies that you are logging in from a known device.

This affects the threshold for how many unsuccessful login attempts trigger a notification to the user.


{$wgCookiePrefix}* Session

When user exits browser Functionality Manage sessions. Provides functionality such as logging in to Wikimedia Projects.


These cookies store your preferences, so that they can be remembered the next time you use the Wikimedia Sites, for a more customized experience.  These cookies are useful for recognizing and maintaining your language preference, remembering changes you have made to text size, fonts and other display preferences, so we can provide you with the look and feel that you want, and more.  

Here are a few examples:

Name Expires Category What does it do?
stopMobileRedirect 30 days Preferences Tells us not to redirect to the mobile site if you don’t like that.
uls-preferences Local Storage, not a cookie Preferences Allows you to set preferences for the Universal Language Selector functionality.
hidewatchlistmessage- [watchlistMessageId]

● where watchlistMessageld is the Id of the message being hidden

28 days Preferences Allows a user to hide a watchlist message.
userFontSize Local Storage, not a cookie Preferences Keeps track of your preferred font size on the mobile site.
preferredEditor Local Storage, not a cookie Preferences Keeps track of your preferred editor on the mobile site.

Performance and Analysis:

These cookies count the number of visitors and collect information about how you use the Wikimedia Sites. This allows us to better understand your user experience on the Wikimedia Sites and helps us improve them for you and other users — for instance, by making sure users are finding what they need easily. Other examples include:

  • remembering pages visited, and actions taken on the Wikimedia sites so we can optimize the pages;
  • remembering if users get error messages from web pages;
  • storing your most recently read articles directly on your device, so they can be retrieved quickly;
  • remembering the topics searched so that we can optimize the search results we deliver to you;
  • remembering the list of articles you are following on your watchlist so that we can recommend similar articles that you may be interested in.

Here are a few examples:

Name Expires Category What does it do?
centralnotice_bucket 7 days Performance and Analysis Helps us understand the effectiveness of notices provided to users through the CentralNotice extension. For more details, see Extension:CentralNotice
ext.popups.core.previewCount Local Storage, not a cookie Performance and Analysis Helps us understand the effectiveness of Hovercards.
WMF-Last-Access 30 days Performance and Analysis Helps us calculate Unique devices accessing our site. See:


We will never use third-party cookies unless we get your permission to do so. These cookies would allow us to render services provided by third parties, such as “like” and “share” buttons. When a third party provides these kinds of services, they may require the use of a cookie in order to provide their services.

If you ever come across a third-party cookie transferred to your device during your access of the Wikimedia sites, where you did not take any action to authorize the use and/or transfer of that cookie (such as one that may have been mistakenly placed by another user or administrator), please report that cookie to us at



  • ブラウザ設定でローカル保存データを削除または無効化する。
  • 第三者のCookieをブロックできるブラウザを使用する。
  • ローカル保存データをブロックするプラグインをインストールする(利用可能であれば)。



さらなる情報を得るには、プライバシー・ポリシーをお読みください。更に質問がありましたら、privacy wikimedia orgでご連絡ください。


Please note that in the event of any differences in meaning or interpretation between the original English version of this document and a translation, the original English version takes precedence.