Encryption runs in your browser — 0-byte upload
All encryption happens in your browser, so your PDF and your password are never uploaded to a server and never leave your computer. Confirm it in DevTools → Network.
Privacy & Security
How to password-protect a PDF without uploading it
Yes — you can add a password and encrypt a PDF entirely in your browser, with no upload. The encryption happens on your own device and the file is never sent to a server. That matters most for exactly the kind of sensitive document you'd want to protect.
Why “in your browser” matters here especially
If you're password-protecting a PDF, it's probably sensitive — which is the worst kind of file to upload to a stranger's server first. A client-side tool encrypts the file on your own device, so the document you're trying to protect never leaves it in the first place.
Password-protect a PDF in your browser (no upload)
1. Open a client-side protect tool (e.g. DockDocs Protect PDF) — the file loads locally in the page. 2. Set a password. 3. Encrypt — the protected PDF is created on your device. 4. Download it; it now requires the password to open. The original never left your computer — no install, no sign-up.
Confirm the file never left your device
Open DevTools → Network (F12) before you protect it. A client-side tool shows no file upload — the bytes (and your password) stay on your device. A server-based tool would instead send your file off to be encrypted elsewhere.
Where DockDocs fits
DockDocs Protect PDF is built so the privacy claim is verifiable.
Free, no watermark, no account
Protect as many PDFs as you need at no cost — no account, no email, and nothing stamped onto your file.
Keep your own password
Because the password is applied on your device, DockDocs never sees it. Remember it — a password-protected PDF can't be opened without it.
Can I password-protect a PDF without uploading it?+
Yes. DockDocs Protect PDF encrypts your file entirely in your browser — the PDF and your password are never uploaded to a server and never leave your device. You can confirm there's no upload in DevTools → Network.
Where does the encryption actually happen?+
On your own device, in your browser. The PDF is encrypted locally and you download the protected file. Nothing — not the file, not the password — is sent to a server.
Does DockDocs see or store my password?+
No. The password is applied on your device during local encryption, so DockDocs never receives it. Keep it safe — a password-protected PDF can't be opened without it, and there's no copy to recover it from.
How do I confirm my file wasn't uploaded?+
Open your browser's DevTools (F12) → Network tab before you protect the file. A client-side tool shows no file upload; if nothing large is sent, the file never left your device.
Is it free, and is there a watermark?+
Protect PDF is completely free with no account or email required, and no watermark is added to the protected file.