KK Archive is a community-focused index for browsing and discovering Koikatsu-related files through structured tags. Its catalog features character cards, scenes, textures, mods, and shared resources, with public listings spanning games and series such as Genshin Impact, Blue Archive, Arknights, and Zenless Zone Zero. Visitors can explore popular themes, view recent releases, search by tag, and find creator-attributed entries. The site also provides separate installation guidance and source-package links for Koikatsu Party and Koikatsu Sunshine, helping users locate the game version associated with their resources.

KK Archive offers browser-based file tools, including PluginDataReader, whose card parsing runs locally in the browser. A Mod Library is available to logged-in members. Site announcements describe ongoing technical, performance, and administrative improvements, while compliance resources include a DMCA takedown policy and an 18 USC 2257 statement. Users can join the KK Archive Telegram group for updates, file-sharing notifications, and a way to report site or file issues.