You upload a file. You get a link. You send the link. But is that file actually secure while it sits on a server somewhere? Here is what you need to know about temporary file sharing security.
Files stored on Cloudflare R2 are encrypted at rest using AES-256. This means if someone physically accessed the storage drives, they could not read your files without the encryption keys.
All transfers — upload and download — use HTTPS (TLS 1.3). Files cannot be intercepted between your browser and the server.
Download links use cryptographically random IDs — not sequential numbers. There are 62^12 possible combinations. Attempting to guess a valid URL is computationally infeasible.
Files are automatically deleted after 7 to 90 days. Most security breaches involve old, forgotten data. Auto-deletion eliminates this risk entirely.
Services with user accounts get breached. Email addresses, passwords, and file histories leak. fff files stores none of this — there is nothing to breach.
Privacy tools we recommend
Proton — encrypted email, VPN, and cloud storage from a Swiss privacy company. Same no-tracking philosophy as fff files.
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