Catbox is a user-funded file hosting service operated by Catbox LLC, offering a simple way to upload and share files. Users can select files from their device or upload them through a URL, with uploads of up to 200 MB allowed. The site also provides account registration and login, along with an FAQ, tools, legal and privacy information, and customer support resources.

Catbox offers related services for different needs, including Catbox Spaces, highlighted for artists and other content creators, and Litterbox, a service for temporary file storage. The brand also maintains a blog and a status page, and invites users to support its operations through direct contributions, Ko-fi, or merchandise purchases. Catbox describes itself as entirely funded by its community and shares its monthly funding progress with visitors. With a playful identity and a focus on accessible file hosting, Catbox brings uploads, supporting tools, and companion storage services together in one online platform.