Encrypted file transfer
Send files with real end-to-end encryption
Most "secure" transfer tools encrypt your file on their servers — which means they hold the keys. BIShare encrypts the file in your browser before it uploads, and the key rides in the link, never touching our servers. We only ever store ciphertext we can't read. End-to-end encrypted, no account, free.
Encrypted in transit isn't the same as end-to-end
Plenty of services say "encrypted" but mean encrypted on their side — they can still read your files, and so can anyone who breaches them. End-to-end encryption means only the sender and recipient hold the key. With BIShare the key is generated in your browser and lives in the link's #fragment, which is never sent in any request — so the server stores bytes it genuinely cannot decrypt.
How BIShare encrypts your transfer
Encrypted before upload
Toggle on end-to-end encryption and the file is encrypted in your browser with AES-256-GCM. Only ciphertext is ever uploaded — chunked and streamed so even multi-gigabyte files never sit in memory.
The key stays with you
The decryption key is placed in the link fragment (#), which browsers never transmit to a server. Share the link and the recipient's browser decrypts locally. Lose the link, and even we can't recover the file.
Or never upload at all
On the same network, BIShare sends files straight between devices over an encrypted channel — the file never reaches the cloud, so there's nothing to intercept or store.
Cloud transfer vs Password ZIP vs BIShare
| Cloud transfer | Password ZIP | BIShare | |
|---|---|---|---|
| End-to-end encrypted | |||
| Key never reaches the server | |||
| No account needed | |||
| Works offline, device-to-device | |||
| Free to use |
Encrypted file transfer: FAQ
What is end-to-end encrypted file transfer?
It means the file is encrypted before it leaves your device and can only be decrypted by the recipient — the service moving it can't read it. BIShare does this by encrypting in your browser and keeping the key out of the server's reach.
How is this different from a password-protected ZIP?
A password ZIP still relies on you sharing a password out-of-band, and the archive is only as strong as that password. BIShare uses a full-strength random key and moves it in the link fragment, so there's no weak password and nothing for the server to see.
Does the server ever see my file?
For encrypted transfers, only ciphertext — the key never reaches us, so we can't decrypt it. For nearby device-to-device transfers, the file never touches our servers at all.
Do I need an account to send securely?
No. Encryption is built in and free with no sign-up. You share a link or code, and the recipient opens it in any browser.
Can I send large files encrypted?
Yes. Encryption streams in chunks, so you can send large files — up to 100 GB free via an encrypted link, and with no size cap for nearby transfers over your own Wi-Fi.
Send your next file end-to-end encrypted
Real encryption, no account, no cost. Grab BIShare for your phone or computer — the recipient just needs a browser.