There does not appear to be any way to control the encoding used by WKWebView to parse a page. When Chrome for iOS was based on UIWebView, we had an autodetection setting based on network-level interception, but that's no longer possible with WKWebView. We've gotten significant post-switch feedback that there is a long tail of sites, particularly CJK sites, where it's impossible to view them correctly now on iOS. If WKWebView had a way to override encoding for a page, it would be possible to provide a workaround for the long tail, as is done in desktop browsers.