Tool · Protect
Lock your PDF with a password.
AES-128 encryption and granular permission controls. Done locally — your password never leaves this tab.
Processed in your browser
Common questions
Frequently asked questions
What kind of protection is applied?
The PDF is encrypted with the password you set, so a reader must supply the passphrase to open it. The encryption happens in your browser, which means the password itself is never transmitted anywhere.
Can you recover the password if I lose it?
No — and nobody else can either. We never receive the file or the password, so there is nothing on our side to recover from. Store it somewhere you trust before you send the document on.
Does password protection upload my PDF to a server?
No. The file is opened, processed and saved back by code running in this browser tab — there is no upload endpoint on our servers to send it to. You can watch the Network panel in your browser's developer tools while you work and confirm nothing carrying the document leaves the page.
Is Password protection free?
Password protection is free with a free account: up to 3 downloads a day, and a small PDFMacro line on each page of a saved PDF. Pro removes both. There are no page or file-size caps on either plan.
Does it work offline?
With Pro, yes. Once the page has loaded, every tool keeps working with the network disconnected, because the processing never depended on a server round-trip; OCR's language packs need one download the first time. A free account needs a connection to save, for its daily count. AI features need your AI: your provider online, or your local model running.
Related
Password Protect runs in your browser. Try it now.
Your file is never uploaded. Work on it right away; a free account saves it. Open a file and see for yourself — the network panel is right there if you want to check.