Zipline

A file upload and link sharing server built to act as a backend for ShareX, so screenshots, recordings and text snippets taken on a desktop can be uploaded and shared by URL. It handles images, text and arbitrary files, and adds folders, tags, URL shortening, password protection, image compression, video thumbnails, storage quotas and Discord embeds, all served through a dashboard and a public API.

It suits people who capture their screen constantly, and teams that need a private pastebin and file drop rather than a public image host.

Hosting it yourself means the captures and uploads live on your own disk, there is no third party watching what you share, and you keep using the same client you already have.