Building an Open-Source, Zero-Knowledge DocSend Alternative with React 19 and Supabase

Why We Built DocTransfer

Sharing sensitive documents like pitch decks, financial reports, or legal contracts shouldn't require paying $250+/month for platforms that store your unencrypted files on their servers.

We built DocTransfer (and open-sourced it on GitHub) as a privacy-first, client-side encrypted document sharing and Virtual Data Room (VDR) platform.

Zero-Knowledge Cryptography Architecture

Most document-sharing services encrypt files at rest on their cloud storage. That means their backend servers - and anyone with access to them - can view your raw documents.