Lock any file behind a passphrase, so you can email it, back it up, or carry it on a USB stick and
no one without the passphrase can open it. Drop a file to lock it — or drop a locked .lbx
file to unlock it.
🔒 The file is locked/unlocked on your device — no upload, no server, works offline.
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Drop a file here, or
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⚠ There is no way to recover a forgotten passphrase —
if you lose it, the file is gone for good. Use something you’ll remember, or write it down somewhere safe.
Honest about what this protects — and what it doesn’t
It encrypts your file with AES-256-GCM, using a key stretched from your passphrase
(PBKDF2, 250,000 rounds) — the standard building blocks, run in your browser.
Good for: keeping a file private from someone who gets the file but not your passphrase — a
cloud backup, an email attachment, a lost USB stick.
Not protection against a hacked or keylogged device, a weak or reused passphrase (use a long,
unique one — several random words is ideal), or anyone who has your passphrase.
If your need is high-stakes or life-safety, don’t rely on a web page — use established,
audited tools (like age, GPG, or Signal). This is for everyday privacy.
Nothing is uploaded — open the page source and check. Lose the passphrase and the file cannot be opened,
by anyone, including you. That’s the point.
Free to copy, run, and reuse (CC0). A small, honest tool. (“Lockbox” is a working name.)