One-Time File Sharing — Encrypted Self-Destructing Download Links

What is a one-time file?

A one-time file is a file you send through a one-time download link. The recipient can download it once by default, then the encrypted copy is permanently deleted. If you allow up to 10 downloads, it remains available only until the final download or expiry. It is the file-sharing equivalent of a self-destructing message: a one-time URL that disappears after the file lands.

Why use one-time encrypted file sharing?

Regular file sharing leaves copies sitting in chat history, email inboxes, and cloud folders for far longer than necessary. pil.rosproc.win is built for the opposite use case: deliver a one-time file, let the recipient download it, and remove it from the server. It works as a drop-in Firefox Send alternative for one-shot encrypted file delivery.

Encrypted before upload

The browser encrypts the file first. The server only receives encrypted bytes.

Optional passphrase

Add a second factor so the link alone is not enough to decrypt the file.

One-time download

Once the recipient downloads the file, the stored copy is deleted from the server.

Text Secret Sharing

Need to send a password, API key, or short note instead of a file? Use secure password sharing.

What secure file sharing is good for

This page is best for one-off handoffs: configuration exports, client certificates, NDA PDFs, database backups, screenshots with sensitive data, support bundles, and internal documents that should not live forever in Slack, email, or a shared drive.

How the encrypted file flow works

Choose a file, optionally add a passphrase, and create the link. The browser packs the file together with its metadata, encrypts the whole payload locally, and uploads only the encrypted blob. The recipient gets a one-time download link. On open, the browser decrypts the file locally and the server deletes the encrypted copy after the final allowed download.

A Firefox Send and WeTransfer alternative for one-time files

If you used Mozilla Send (Firefox Send) before Mozilla shut it down, or you reach for WeTransfer to move a sensitive file, pil.rosproc.win covers the same one-time file transfer need with stronger guarantees. Firefox Send was discontinued in 2020; pil.rosproc.win is an actively maintained, open-source replacement. Unlike WeTransfer — which stores files in a form the company can read — every file here is encrypted in your browser before upload, delivered through a one-time download link, and destroyed after the final allowed download or expiry. It works for one-time file sharing, one-time file transfer, and one-time download links without any account.

Key terms, briefly defined

One-time download link: A URL that delivers a file once by default. If the sender allows more downloads, the encrypted file is permanently deleted after the final allowed download or when it expires.
Browser-side file encryption: Encryption performed entirely in the sender's browser using AES-256-GCM via the Web Crypto API. The file never leaves your device in plaintext form.
Encrypted file metadata: Filename, MIME type, and size are bundled inside the encrypted payload — not stored separately on the server. The server cannot tell what was sent or how large the original file was.
Self-destructing file: A file that is automatically deleted after its final allowed download or when the expiry timer fires, whichever comes first — leaving no copy on any server.

Frequently asked questions

How does secure file sharing work on pil.rosproc.win?

Your file is packed and encrypted in the browser before upload. The server stores only encrypted bytes. The download link works once by default. When you need to send the file to a few people, you can allow up to 10 downloads. The encrypted file is deleted after the final allowed download or when the expiry time is reached.

Can the server see my file name or contents?

No. The file contents and file metadata stay inside the encrypted payload. For now, the filename, MIME type, and size are not stored separately on the server.

Can I protect the file link with an extra passphrase?

Yes. Add an optional passphrase when creating the link. The recipient will need both the link and that passphrase to decrypt the file.

What files can I send securely?

Any file up to 80 MB, including PDFs, text files, archives, certificates, configuration exports, screenshots, and private documents.

Send a one-time file download link