nHentai is the most visited site with hentai, manga, and doujinshi comics. At nHentai, you can read more than 300k comics for free. If you need to download a comic without a torrent, use Locoloader - it's very easy:
Notice of Non-Affiliation and Disclaimer: Locoloader is not affiliated, associated, authorized, endorsed by, or in any way officially connected with nHentai, or any of its subsidiaries or affiliates. The official nHentai website can be found at https://nhentai.net. The name ‘nHentai,’ as well as related names, marks, emblems and images may be registered trademarks of nHentai.