UPaper is a Korean digital content marketplace and web publishing platform where anyone can create, publish, buy, and sell e-books. Its catalog spans a wide range of subjects and formats, including fiction, romance, fantasy, humanities, travel, business, economics, education, technology, science, self-development, arts, language learning, exam preparation, magazines, webtoons, and illustrated works. Readers can browse new, popular, recommended, discounted, rental, downloadable, and free content, as well as subscription offerings.

The site showcases titles in formats such as PDF and EPUB, covering everything from novels and travel writing to study guides, professional exam materials, and practical software instruction. UPaper also supports creators and publishers by providing a platform for distributing their work and reaching readers through themed categories and featured-paper selections. The service is operated by UPaper Co., Ltd., which provides customer support and publishes notices, inquiries, and help information for users.

By bringing independent publishing and digital retail together, UPaper offers a broad marketplace for discovering and sharing Korean-language e-books and other digital publications