Penthouse Letters Magazine can be read for free on websites such as Magzus and Magstack. Each of these sites provide access to the full magazine; however, they only stock a small number of back issues. Access to the magazine is only within the site and cannot be downloaded.
Each of these sites offer the most recent copies of the online magazine, but with disabled videos and hyperlinks. Free downloadable PDF files of archived magazines can be found on some sites, such as World Mags. Penthouse features a section of the latest magazine on its site called "Letter of the Month." This is a preview of one full article in the latest edition of the magazine.