Quick answer: End-to-end encryption means data is encrypted on the sender's device and can only be decrypted by the intended recipient, so even the service carrying it cannot read it.
End-to-end encryption (E2EE) explained
End-to-end encryption means only the sender and the intended recipient can read the data, not the service in between. The keys stay on the users' devices. Messaging apps like Signal, and WhatsApp for chats, work this way. The server only ever handles scrambled data.
Most link-based file transfer services, including this one, are not end-to-end encrypted. Files travel over HTTPS, which encrypts them in transit, and you can add an optional password to the link, but the files are stored on the service's servers until the link expires and they are deleted.
For sensitive files, encrypt them yourself before uploading. A password-protected ZIP with AES-256 works well: send the link one way and the password another, for example by phone or a separate message.
Levels of protection compared
| Setup | Safe from others on the network | Unreadable on the server | Who can open it |
|---|---|---|---|
| HTTPS only | Yes | No | Anyone with the link |
| HTTPS plus link password | Yes | No | Anyone with the link and password |
| Encrypted ZIP sent over HTTPS | Yes | Yes | Only people with the ZIP password |
| End-to-end encrypted app | Yes | Yes | Only the chosen recipients' devices |
Encrypting a ZIP yourself gives you the key benefit of end-to-end encryption for a single file: the service stores only scrambled data.
How to encrypt a file before uploading
- Open the password-protect ZIP tool on this site (the ZIP is made on your device) or use 7-Zip.
- Add the files and choose AES-256.
- Use a long passphrase of four or more random words.
- Upload the ZIP and send the download link as usual.
- Tell the recipient the password another way, such as a phone call.
Note that Windows File Explorer and the Mac's built-in tool cannot open AES-256 ZIPs. The recipient will need 7-Zip, WinRAR, Keka or The Unarchiver.
What end-to-end encryption does not do
- It does not stop the recipient from forwarding, copying or screenshotting the file once it is open.
- It does not protect a device that already has malware on it.
- It cannot help if the password is lost. Nobody, including the service, can recover the contents.
Frequently asked questions
Is this site end-to-end encrypted?
No. Transfers are encrypted in transit with HTTPS and can have a password, but they are not end-to-end encrypted. Encrypt sensitive files in a password-protected ZIP before uploading.
Is HTTPS the same as end-to-end encryption?
No. HTTPS protects data between your browser and the server. End-to-end encryption also keeps it unreadable to the server.
If I forget my ZIP password, can it be recovered?
No. With strong AES-256 encryption there is no back door, so keep the password somewhere safe.
Do I need end-to-end encryption for everyday files?
For holiday photos or videos, HTTPS and an optional link password are usually enough. For medical, legal, financial or identity documents, encrypt them yourself first.
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