Site data
Also known as: website data, stored site data, per-site storage
Site data is the umbrella term for everything a website stores on your device — cookies, localStorage, IndexedDB, and service-worker caches. It is what browsers list per site and what fills the storage a single site uses; clearing it removes all of those and resets the site.
- Covers cookies, localStorage, IndexedDB, and SW caches
- Listed per site so you can find heavy sites
- Clearing it signs you out and resets the site
What “site data” covers
When a browser shows how much space a site is using, it counts its site data: cookies, localStorage and sessionStorage, IndexedDB records, and any Cache Storage from a service worker. The page cache (images and scripts) is often listed alongside it.
Looking at site data per site is the practical way to find which website is holding the most space, since a single web app can stack several storage types together.
Clearing it and what resets
In Chrome, see and clear it under Settings > Privacy and security > Site settings > View permissions and data stored across sites, or remove it for all sites via Delete browsing data > Cookies and other site data. In Safari on iOS, Settings > Apps > Safari > Advanced > Website Data lets you clear data site by site.
Clearing a site’s data signs you out, drops saved preferences, and removes any offline copy — effectively resetting that site to a first-visit state, while freeing the space it held.