Open Settings
Scroll down and tap Safari
Tap Clear History and Website Data
Tap Clear History and Data to confirm
To remove cookies from a specific site, go to Settings
Tap Safari
Tap Advanced
Tap Website Data
Tap Remove All Website Data
To clear cookies in Chrome, open Chrome
Tap the three dots menu
Tap History
Tap Clear Browsing Data
Select Cookies, Site Data
Tap Clear Browsing Data
To clear cookies in Firefox, open Firefox
Tap the menu button
Tap Settings
Tap Data Management
Turn on Cookies
Tap Clear Private Data