ConvertX
Web-based file converter you run on your own server via Docker
What it is
A self-hosted web app that converts images, documents, ebooks, video, audio, 3D assets and data files between more than a thousand formats. It wraps tools such as FFmpeg, ImageMagick, LibreOffice, Pandoc, Calibre and Inkscape behind one browser interface, with batch processing, user accounts and password protection. People who would rather not upload private files to online conversion sites can run it at home or for a small trusted group.