What are cookies and how do they work?
Cookies are small text files, which contain small amounts of information, that are placed on your device. Your internet browser sends these cookies back to the website every time you visit the site, so the website can recognise your device.
A cookie will not access any information other than the information you provide to us when you visit the website.
There are two main types of cookies:
- First-party cookies – these are set by the website you are visiting;
- Third-party cookies – these are set by other sites or applications.
Cookies are required to provide some of the services and experiences on our website. They are widely used in order to make websites work, or work more efficiently, as well as to provide information to the owners of the site.
What types of cookies do we use on our website?
Essential/strictly necessary cookies
Some cookies are essential so that you can move around the website and use its features. Without these cookies, services you've asked for can't be provided. These cookies don't gather information about you that could be used for marketing or remember where you've been on the internet.
Examples of essential cookies:
- When you add something to an online shopping basket, cookies make sure it's still there when you get to the checkout;
- Cookies keep you logged in during your visit; without cookies you might have to log in on every page you go to;
- Some are session cookies, which make it possible to navigate through the website smoothly. However, these are automatically deleted after you close your web browser.
Other cookies are non-essential but important to improving your experience on our website.
Examples of functionality cookies:
- Remembering a previous search term, so you don’t have to type it in again;
- Remembering if you've filled in a survey, so you're not asked to do it again;
- Enabling social media components, like Facebook or Twitter.
Performance cookies (for analytics)
To help us keep our website content relevant and up to date, we like to keep track of which pages and links are not only popular and performing well, but also those that aren’t, so we can make improvements. It's also very useful to be able to identify trends of how people find their way through our site.
Analytics cookies are used to gather this information. The information collected is anonymous and is grouped with the information from everyone else’s cookies. We can then see the overall patterns of usage rather than any one person’s activity. Analytics cookies only record activity on the site you are on and they are only used to improve how a website works.
Other analytics and metrics tools
Our marketing emails make use of a “Clear Image” (gif) to track, in aggregate, the results of an email campaign. If you wish to turn off this tracking, you can do so by turning off the images in the email itself.
We also may use tools to monitor, in aggregate, the effectiveness of our communications with subscribers to our updates, including email tracking, which records when an email update from the Gallery is opened and/or how many links are clicked within the message.
List of first-party cookies set by nationalgallery.org.uk
This is a list of the cookies the National Gallery sets to enable it to run its website, and what each is used for:
Purpose: This is used to determine whether you are signed in to our website.
Purpose: This is used to temporarily remember some of your choices on the website. It does not identify you personally and is deleted at the end of your browser session.
Name: Advanced, PageSize, SortFields
Duration: Three months
Purpose: These three cookies are used by the archive search to remember your choices of simple or advanced search, the number of results in a page, and which field you like to sort by.
Purpose: This helps us to control which server your requests are sent to on the Membership section of the website.
Purpose: This is used to temporarily remember some of your choices on the Membership section of the website. It does not identify you personally and is deleted at the end of your browser session.
Name: TNEW, TNEWFetch, TNEWFetchTs
Purpose: Used to track sessions while you are using our ticketing website, e.g. to keep track of your shopping basket while you browse around the website.
Purpose: This is an “anti-forgery token”. It increases security by helping to ensure that form values submitted to us really come from a form on our website.
Duration: One year
Purpose: This is associated with Quantcast, a digital advertising company. They provide website rankings, and the data they collect is also used for audience segmentation and targeted advertising.
Name: _dc_gtm_UA-78441328-1, _dc_gtm_UA-7349638-9
Duration: One minute
Purpose: These are associated with Google Tag Manager, used to load other scripts and code into the page.
Duration: 90 days
Purpose: Used by Facebook to deliver a series of advertisement products such as real time bidding from third party advertisers.
Duration: Two years
Purpose: This is associated with Google Universal Analytics. It is used to distinguish unique users by assigning a randomly generated number as an identifier. It is included in each page request in a site and used to calculate visitor, session, and campaign data for the site’s analytics reports.
Name: _gat_UA-78784590-1, _gat_UA-78441328-2
Duration: One minute
Purpose: These are set by Google Analytics. It is used to limit the amount of data recorded by Google on high-traffic volume websites.
Duration: 90 days
Purpose: Used by Google AdSense for experimenting with advertisement efficiency across websites using their services.
Duration: One month
Purpose: This is associated with Google Universal Analytics. It stores and updates a unique value for each page visited.
Duration: One year
Duration: 30 minutes
Purpose: This is associated with the Microsoft Application Insights software, which collects statistical usage and telemetry information for apps built on the Azure cloud platform. This is a unique anonymous session identifier cookie.
Duration: one year
Purpose: This is associated with the Microsoft Application Insights software, which collects statistical usage and telemetry information for apps built on the Azure cloud platform. This is a unique user identifier cookie enabling counting of the number of users accessing the application over time.
Duration: 20 minutes
Purpose: This is associated with our email marketing company, DotMailer. Their software enables us to track when email campaign recipients land on our website, which enables monitoring of the effectiveness of a campaign. This cookie is a short-lived session identifier.
Purpose: This holds the value 1 or 0 to indicate if you have items in your basket on our ticketing website. It is used to adjust the appearance of the page header.
Purpose: This holds your initials if you are currently signed in to our ticketing website. It is used to adjust the appearance of the page header.
Duration: 14 days
Purpose: This tells us you have already seen and clicked on a popup prompt to take part in an online survey, so that we don't show it to you again.
Duration: One year
Purpose: This is associated with our email marketing company, DotMailer. Their software enables us to track when email campaign recipients land on our website, which enables monitoring of the effectiveness of a campaign. This cookie is a unique user identifier, enabling persistent linking of behaviour on the site to a particular user and email campaign response.
Duration: Seven days
Purpose: This is used to remember any promo code that was included in a link from one of our emails or online adverts. The promo code is then passed to our ticketing website so that we can monitor how well our marketing is working, and so you can benefit from any offer included in the link. The cookie does not identify you individually.
Name: utm_campaign, utm_medium, utm_source
Purpose: These tell us how you initially arrived at our site at the start of your visit, e.g. from an online advert or an email.
Third-party cookies on nationalgallery.org.uk
We embed content and scripts and make use of applications from a number of third-party websites, such as AddThis and YouTube. As a result, when you visit a page of the Gallery’s website containing this embedded content you may be presented with cookies from these websites.
We do not control the dissemination of these cookies. However, if you wish to restrict or block them you can do so through your browser settings. The help function within your browser should tell you how. If you would like more information about the cookies used by these third-party websites, as well as information on how to restrict or block them, please see their individual privacy policies.
Our website also carries embedded ‘share’ buttons to enable you to easily share articles with your friends through a number of popular social networks. These social networking sites may set a cookie when you are also logged in to their service. We do not control the dissemination of these cookies and you should check the relevant third-party websites for more information about these.
We also work with marketing partners who place cookies on our site to deliver Gallery advertising and content relevant to you when you visit other websites. If you don’t want to be shown such targeted advertising messages from the National Gallery on those third party sites, some sites allow you to request not to see such messages
Third-party websites that send cookies to you as a result of visiting our pages may include: addthis.com, doubleclick.net, facebook.com, google.co.uk, google.com, justgiving.com, quantserve.com, trackedweb.net, and youtube.com. This is not meant to be an exhaustive list.
How to control and delete cookies
If you wish to restrict or block the cookies which are set by our website, or indeed any other website, you can do this through your browser settings. The help function within your browser should tell you how.
Alternatively, you may wish to visit the sites listed at the beginning of this policy which provide information on how to do this on a variety of browsers. On these sites you will also find details about how to delete cookies from your computer as well as more general information about cookies.
For information on how to block or delete cookies on the browser of your mobile phone you may need to refer to your handset manual. Please note, however, that it is not possible to restrict or block essential or strictly necessary cookies.
Please be aware that restricting cookies may impact on the functionality of our website and your user experience. We recommend you leave them turned on. For example, if you block or otherwise reject cookies you will see the cookie message pop-up on every page.