Papermerge

Papermerge is a document management system built around the way scanned paper arrives in a stack. It applies OCR automatically on upload, supports PDF, TIFF, JPEG and PNG, and organizes files with folders, colored tags, document types such as invoice or receipt, and custom fields, with versioning, sharing and granular permissions.

Offices use it as a long-term archive where a search for a text fragment finds a physical document again, and it can be driven by a REST API.

Keeping it on your own infrastructure leaves the archive untouched by third parties, costs nothing per document, and stores the files where your own backup rules decide.