Each time you access a file through your web browser, the browser caches it. By doing this, the browser does not have to retrieve files (including any images) from the remote website each time you click Back or Forward. You should periodically clear the cache to allow your browser to function more efficiently.

A cookie is a file created by a web browser at the request of a website and then stored on your computer. These files typically store user-specific information such as selections in a form, shopping cart contents, or authentication data. Browsers normally clear cookies that reach a certain age, but clearing them manually may solve problems with websites or your browser.

A browser's history is a log of sites that you visit. When you press the back button in your browser, you are moving back one entry in the history log. Browsers normally clear their history at regular intervals, but you may want to clear it manually for privacy reasons.

Google Chrome

1. Press Ctrl+Shift+Delete (Windows and Linux) or Cmd+Shift+Delete (Mac). Alternatively, open the Chrome menu and select Delete browsing data.
2. Choose a time range, such as All time.
3. Check Cookies and other site data and Cached images and files, along with anything else you want to remove.
4. Click Delete data.

Chrome on Android

1. Tap the More icon (three dots) at the right of the address bar, then tap Delete browsing data.
2. Choose a time range and check Cookies and other site data and Cached images and files.
3. Tap Delete data.

Microsoft Edge

1. Press Ctrl+Shift+Delete (Windows) or Cmd+Shift+Delete (Mac). Alternatively, open the Edge menu, select Settings, then Privacy, search, and services.
2. Choose a time range and check Cookies and other site data and Cached images and files.
3. Click Clear now.

Mozilla Firefox

1. Press Ctrl+Shift+Delete (Windows and Linux) or Cmd+Shift+Delete (Mac). Alternatively, open the Firefox menu and select Settings, then Privacy & Security.
2. Under Browsing data, click Clear browsing data.
3. Next to When:, choose Everything, and check Temporary cached files and pages and Cookies and site data.
4. Click Clear.

Safari on Mac

To clear cookies and site data:

1. Open Safari and select Safari > Settings from the menu bar (or press Cmd+,).
2. Click the Privacy tab, then click Manage Website Data.
3. Click Remove All to delete the stored cookies and site data.

To clear the cache:

1. Enable the Develop menu: select Safari > Settings, click the Advanced tab, and check the box to show the Develop menu (labeled Show features for web developers on current versions, Show Develop menu in menu bar on older versions).
2. Select Develop > Empty Caches from the menu bar.

Safari on iPhone and iPad

1. Open the Settings app and go to Apps > Safari (on earlier versions of iOS, open Settings and scroll down to Safari).
2. Tap Clear History and Website Data.
3. Choose a time range if prompted, then confirm.

Notes

• If you do not see instructions for your browser, search your browser's Help menu for clear cache.
• When troubleshooting issues with any website, after clearing your browser's cache and cookies, exit your browser completely before attempting to access the site again. In Windows, close all your browser windows; in Mac OS X, quit (Command-q) your browser.
• Clearing your cookies will clear website passwords, sign-in information (whether sites recognize you), site-specific preferences, and similar stored data.