Cookies and the browser cache store different kinds of website data. Cookies contain small pieces of information, such as a sign-in identifier or language preference, that your browser can send back to a site. The browser's HTTP cache saves copies of web content, including images and style sheets, to reuse on later requests.

Those differences matter when you choose what to delete. Removing cached files can refresh outdated page content, while removing cookies can change whether a site recognizes your login or remembers your choices. You don't necessarily need to clear both to fix one problem. The browser's selected categories determine what actually gets removed.

What the Browser Cache Stores

To load a webpage, your browser usually requests the main document and then any additional resources, such as scripts, fonts, and images. The browser can keep copies of responses that are eligible for caching. On a later visit, a stored copy may replace a network download. The site's instructions and the browser's caching rules determine which responses can be stored and when the browser can reuse them.

A cached response is considered fresh while its allowed reuse time has not run out. The browser can generally reuse a fresh copy without checking for an update, unless another cache rule requires that check. Fresh doesn't necessarily mean the newest version on the server. When validation is needed, the browser can ask the server whether the content has changed. If the server confirms that the copy is still current, the browser can reuse it without downloading the entire file again.

If an outdated cached file causes a display problem, clearing the cache can make the browser fetch the file again. Images or page styling may then appear correctly, although the first load can take longer. A fresh download won't fix an error in the site's current files. Cache deletion also leaves the site's database alone, so it cannot remove an order, cancel a subscription, or change information in your account.

What Cookies Do

A website can give your browser a cookie and receive its value on later requests that meet the cookie's rules. For example, after you sign in, the site may store a session identifier in a cookie. The server uses that identifier to look up your active session, so you don't have to enter your password for every page. Other cookies can hold a language choice, identify a shopping cart, or help measure visits.

A cookie's lifetime controls how long the browser keeps it. Persistent cookies have an expiration date or maximum age; session cookies last for the browser session as the browser defines it. Whether the cookie is persistent or session-only doesn't by itself determine how long the site keeps you signed in. The website can expire your login on its server while the cookie is still present, and the browser can remove a cookie before its scheduled expiration.

When you delete a sign-in cookie, the browser loses the value that the site used to recognize your session. You may need to log in again, and preferences or a cart linked only to deleted cookies may disappear. That local deletion doesn't erase account records held by the website. An account-based cart or preference may return after you sign in, and the site can set new cookies as you continue browsing.

Choosing What to Clear

For an old image or broken layout, start with a normal reload. If you still suspect a cached copy, clearing cached images and files is a more relevant step than deleting sign-in cookies. When the browser offers separate categories, select the cache category and leave cookies unselected if you want to keep them. A broad option for removing all of a site's data may have a different effect.

For a site that keeps applying an unwanted saved preference or using the wrong login, consider that site's cookies and other stored data. A site-specific option, where available, avoids deleting every site's stored data. Clearing cookies across the whole browser can disrupt logins and preferences on other sites too. Before deleting anything, check that you can sign back in to any account you still need.

If your aim is to end a signed-in session, use the website's sign-out command. Deleting a cookie removes the browser's copy of an identifier but doesn't necessarily invalidate the corresponding session on the server. A properly implemented sign-out does invalidate that session. If you need to end sessions on other devices as well, check the account's own session controls; deleting data in one browser is not proof that those other sessions have ended.

Cookies and Other Site Data

Sites can also save information through local storage or IndexedDB, which are separate browser storage systems. A browser may group that information with cookies in its deletion controls. Chrome, for example, lists Cookies and other site data separately from Cached images and files. Firefox also has separate categories for cookies and site data and for temporary cached files and pages, while some site-specific controls can remove several kinds of data together.

Read the selected categories and time range before confirming a deletion. Browsing history, autofill information, and site permissions may have their own controls, and passwords saved in a password manager are separate from sign-in cookies. Clearing cookies and cache therefore isn't a complete reset of everything a browser or website knows about you. If you also select synced history or autofill data, check whether the browser will apply that deletion to other devices.