App - SecureTransfer

Overview

SecureTransfer is a zero-knowledge encrypted file sharing service built for privacy-first workflows. You drop files into the browser, and they are encrypted locally using AES-256-GCM before anything leaves your device. The decryption key lives in the URL fragment (#key=...), which browsers never send to the server — meaning not even the operator can read your files.

Recipients open the share link and decrypt entirely in their browser. No accounts, no sign-ups, no trust required.

For the live service, visit SecureTransfer.

How it works

1. You drop files into the browser
2. AES-256-GCM key is generated client-side
3. Files are encrypted in your browser before leaving your device
4. Encrypted blobs are uploaded to Cloudflare R2
5. A share link is generated with the decryption key in the URL fragment
6. Recipients decrypt in their browser — the key never touches the server

Key features

• End-to-end encryption AES-256-GCM, keys never leave the browser. The server only ever handles encrypted data.

• No accounts required Anonymous by default. Drop files and share instantly.

• Configurable expiry Set transfers to expire from 1 hour up to 365 days.

• Download limits Control how many times a transfer can be downloaded.

• Email notifications Notify recipients and receive sender confirmations.

• Transfer tracking View counts, download counts, and live status for every transfer.

• QR code sharing Auto-generated QR codes for every transfer link.

• Dark mode & mobile-friendly Follows system preference with manual toggle. Fully responsive design.

Tech & focus areas