{
  "id": 2957726,
  "title": "Building an Open-Source, Zero-Knowledge DocSend Alternative with React 19 and Supabase",
  "url": "https://urgent.news/2026/08/24/building-an-open-source-zero-knowledge-docsend-alternative-with-react",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-08-24T05:45:47.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/roushan71262/building-an-open-source-zero-knowledge-docsend-alternative-with-react-19-and-supabase-3oap"
  },
  "original_language": "en",
  "account": "DocTransfer is an open-source, zero-knowledge document sharing platform that aims to provide privacy-first document sharing and Virtual Data Room services. The developers created it to avoid paying high monthly fees for platforms that store unencrypted files on their servers. DocTransfer implements zero-knowledge cryptography architecture, ensuring that encryption happens entirely on the client-side before any data leaves the browser.\n\nThe client-side encryption utilizes WebCrypto API and OpenPGP.js for OpenPGP encryption, as well as AES-256-GCM for AES encryption. Encryption keys are kept in URL hash fragments (#key=...) and never sent to the servers. Digital Certificate generation is also part of the security measures, along with biometric sign-in using SimpleWebAuthn.\n\nThe frontend of DocTransfer is built with React 19, TypeScript, Vite, and Framer Motion. The database and authentication system are powered by Supabase, which includes PostgreSQL with strict Row-Level Security, Edge Functions, and Storage. Document processing is handled by pdf-lib, react-pdf, and pdfjs-dist libraries.\n\nUsers can interact with the platform through a live app available at doctransfer.app. The developers encourage feedback on the client-side encryption flow, PDF rendering optimizations, and overall user experience, and welcome contributions from the open-source community.",
  "summary": "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…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}