If files are encrypted, how can I download a selection as a single ZIP archive?

Downloading multiple files as a ZIP archive is possible because the entire process of creating said archive happens securely within your web browser, without our servers ever seeing your unencrypted data.

Here's how it works:

1. When you select more than one file to download, your browser sends a request to our server for the encrypted data of those files.
2. Using the secret key from the URL, your browser decrypts the data on your device.
3. As the data is decrypted, your browser simultaneously constructs the ZIP archive “on the fly” in your browser and streams it directly to the browser's download manager.
4. You receive a single ZIP archive containing all the selected files, ready to use.

This entire operation - fetching, decrypting, and zipping - is handled locally on your machine, and at no point is the unencrypted content of your files or the final ZIP archive exposed to the server.