Magmag is a Japanese newsletter platform launched in 1997, connecting readers with publications across business, finance, news, education, entertainment, travel, lifestyle, and many other interests. Its portal helps users discover free and paid newsletters through categories, search, featured picks, and rankings.

The service also enables individuals and organizations to publish newsletters without charge, with options to set subscription prices, publishing schedules, reader access, and trial content. Articles are delivered directly by email, and publishers retain the copyright to their work. Paid publishers can also sell back issues and earn recurring revenue from subscriptions.

Magmag supports creators beyond distribution, offering guidance with newsletter planning, technical setup, reader support, audience growth, media promotion, collaborations, events, and community initiatives. It provides assistance with promotional opportunities such as web media features and video collaborations, and can introduce suitable corporate partnership opportunities. The platform is designed to let writers focus on creating content while Magmag helps manage publishing and develop their readership.