Question 1

Is file-sharer really end-to-end encrypted?

Accepted Answer

Yes. A symmetric AES-256 group key is created on your first device and shared only with devices you link. Messages and files are encrypted before they leave your device, and the server only ever handles ciphertext.

Question 2

Do I need an account or email?

Accepted Answer

No. There are no accounts, no email and no passwords. You create a space on one device and link your other devices to it with a QR code.

Question 3

Can you read my messages or files?

Accepted Answer

No. The server is zero-knowledge by design: it stores only ciphertext, public keys and SHA-256 hashes. Without the keys that live on your devices, the data is unreadable.

Question 4

What is the maximum file size?

Accepted Answer

You can share files up to 50 MB. Files are encrypted on your device, delivered to your other devices, then removed from the server automatically.

Question 5

Does it work offline?

Accepted Answer

Yes. file-sharer is a progressive web app you can install. Your message history is stored locally, so it remains available even when you are offline.

Question 6

How do I add another device?

Accepted Answer

On the new device choose to link to an existing space to get a QR code, then scan it from a device already in the space. The encryption keys are exchanged securely during pairing.