Do any of these websites offer offline reading capabilities?

Generally, no. Most free online comic websites require an internet connection to read comics. However, some platforms like Webtoon and Tapas allow you to 'favorite' or 'follow' comics, which may provide some limited offline access to recently viewed episodes depending on the app and your device. You might need to use a third-party app or browser extension to download comics for offline reading, but be mindful of copyright restrictions.