How to Password Protect a File Before Sharing (Zero-Knowledge Encryption)

The way to password protect a file before sharing it is client-side encryption: your browser scrambles the file with a key derived from your password before a single byte uploads, so the server only ever stores ciphertext it has no way to open.

Standard cloud storage services encrypt files after they reach server infrastructure (Server-Side Encryption) instead. This means:

• System administrators have technical capability to inspect file contents.
• Data center breaches can expose raw unencrypted files to hackers.

Client-Side Encryption (Zero-Knowledge) converts your raw file into scrambled ciphertext inside your browser before it leaves your device. Your password and the unencrypted file are never sent to the server; storage holds only ciphertext. (We serve the code that does the encrypting, so this rests on that code being the published version — see our security page.)

Zero-knowledge describes the file's contents, not the transfer. The server still reads and stores the surrounding record — file size and type, the file name on cloud uploads, who uploaded it and when, and the IP address and browser of each side — and keeps it for the periods published in the privacy policy, not indefinitely.

GetFileShare utilizes the native W3C Web Crypto API built into modern web browsers:

1. You select a file and enter a secret password.
2. Key derivation algorithms generate a cryptographic key from your password.
3. AES-256-GCM encrypts the file byte-by-byte in browser memory.
4. Only the encrypted ciphertext blob is uploaded to object storage.

Apply AES-256-GCM client-side encryption before uploading. Only people with your password can unlock it.

1. Open getfileshare.cloud/upload.
2. Select your document (PDF, DOCX, XLSX, image, or ZIP archive).
3. Toggle Password Protection ON.
4. Enter a strong decryption password.
5. Click Upload & Generate Link.
6. Send the file link to your recipient, and share the password through a separate end-to-end encrypted channel (e.g. Signal or WhatsApp).

• Use Out-of-Band Channels: Send the file link via Email or Slack, but send the decryption password via Signal or encrypted SMS.
• Choose Strong Passwords: Avoid simple words; use passphrase combinations or generated keys.
• Set Auto-Expiry Timers: Select short expiration windows (e.g., 24 hours) for high-sensitivity files.