Google Chrome
Open menu (⋮ top right)
Select More tools → Clear browsing data
Choose Cached images and files
Click Clear data
Microsoft Edge
Open menu (⋯ top right)
Go to Settings → Privacy → Clear browsing data
Select Cached images and files
Click Clear now
Safari (Mac)
Go to Safari → Preferences → Advanced
Tick Show Develop menu
Then click Develop → Empty Caches
Firefox
Open menu (☰ top right)
Go to Settings → Privacy & Security
Under Cookies and Site Data, click Clear Data
Select Cached Web Content and click Clear
Chrome (Android/iOS)
Open menu (⋮ or ⋯)
Tap History → Clear browsing data
Choose Cached images and files and tap Clear
Safari (iPhone)
Go to Settings → Safari
Scroll down and tap Clear History and Website Data