Secure file sharing
Send files with real end-to-end encryption. Your file is sealed in your browser with AES-256 before it ever leaves — we can't read it, and we'll show you exactly why.
Encrypted in your browser, then uploaded. Share a link they open anytime.
Why it's actually secure
Encrypted in your browser
Your file is sealed with AES-256-GCM on your device before anything is uploaded. The plaintext never leaves your computer.
Zero-knowledge by design
The decryption key rides in the link's # fragment and never reaches our servers. Only someone with the full link can open the file — not us.
Verifiable, not just promised
Open your browser's network tab and watch the key never get sent. Every download is checked against the original SHA-256 hash.
How it works
Encrypt in your browser
Drop a file — it's encrypted client-side with AES-256 before upload.
Only ciphertext is stored
We receive an unreadable blob and a little metadata — never your file or key.
Share the secure link
The key stays in the link's # fragment; only the recipient can decrypt.
Want the full security model? See exactly what we can and cannot see.
Secure file sharing FAQ
What makes file sharing secure?
Truly secure file sharing uses end-to-end encryption, where the file is encrypted on your device and the service never holds the decryption key. Marsdrop encrypts every file in your browser with AES-256-GCM, so the server only ever sees ciphertext.
Is Marsdrop's file sharing end-to-end encrypted?
Yes. Files are encrypted client-side with AES-256-GCM before they're uploaded, and the key travels in the link fragment, which is never sent to a server. That makes it genuinely end-to-end encrypted.
Can the server read my files?
No. Marsdrop is zero-knowledge: the server stores only the encrypted blob and minimal metadata, and never receives your key or your file's contents — so no one, including Marsdrop, can read them.
Is secure file sharing free here?
Yes. Marsdrop is free, needs no account or registration, and doesn't track you. You just drop a file and share the encrypted link.
More: FAQ · How it works