
Cobalt
Cobalt is a self-hostable web media downloader for saving publicly accessible videos and audio from supported social platforms via a simple paste-a-link interface and API.

Cobalt is a web-based media downloader designed to fetch files from publicly accessible content on supported social platforms. It provides a simple paste-a-link workflow via a clean web UI and also exposes an API for integrations.
Key Features
- Download publicly accessible media by URL (video and audio, depending on the source)
- Web UI plus a dedicated API service (monorepo includes frontend and backend)
- No ads or tracking, with a minimal, fast user experience
- Proxy-style streaming approach and no server-side content caching by default
- Instance configuration via environment variables, suited for self-hosted deployments
Use Cases
- Save personal copies of public videos or audio for offline viewing/listening
- Provide a simple internal “download by link” tool for a team or household
- Integrate media fetching into other tools via the API (automation or archival workflows)
Limitations and Considerations
- Intended for downloading only free, publicly accessible content; access-controlled or paid content is not supported
- Platform compatibility can change as third-party sites update their behavior
Cobalt is a focused, low-friction downloader that pairs a straightforward web interface with an API for programmatic use. It is best suited for users who want a fast, privacy-respecting way to save public media without unnecessary complexity.











