Protect PDF Online — Add a Password
Password-protect a PDF with AES-256 encryption and restrict printing, copying or editing. Free and processed in your browser.
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How to protect a PDF
- 1Select or drop the PDF you want to protect.
- 2Set an owner password, optionally an open password, and pick the restrictions.
- 3Click Protect PDF and download the encrypted file.
FAQ
What is the difference between the two passwords?
The owner password controls permissions (printing, copying, editing). The optional user password is required to open the file — without it anyone can open the document with restrictions applied.
How strong is the encryption?
AES-256 — the strongest standard PDF encryption, applied locally by the same engine as our Unlock tool (qpdf via WebAssembly).
Can restrictions be removed later?
Yes — with the owner password, using our Unlock PDF tool. Nothing is irreversible.
Is my password sent anywhere?
Never. Encryption happens on your device; the password never leaves the browser.