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Protect PDF with a Password – Free, Private PDF Encryption
Contracts, invoices, ID scans, and personal records are often shared as PDFs without a second thought — this tool adds a real password to your PDF so only someone who knows that password can open it. Upload your file, set a password, and download a protected copy that prompts for the password the moment anyone tries to open it in Acrobat, Preview, Chrome, or any other PDF viewer.
The whole process happens in your browser. Your original PDF, your chosen password, and the protected file it creates are never uploaded to or stored on a server — which matters, since the whole point of password-protecting a document is keeping it private, including from the tool doing the protecting.
Already have a protected PDF and need to remove the password once it is no longer needed? Check the related PDF tools below.
Upload your PDF, type the password you want to set, and download the protected file — no account, no software install, and no cost.
Open this page in Safari or Chrome on your Mac, upload the PDF from Finder, set your password, and download the protected version — it works the same as on Windows since everything runs in the browser.
This tool only adds password protection. To remove an existing password, you'll need a PDF unlock tool — check the related tools below.
Since the password isn't stored anywhere by this tool, there's no way to recover it afterward — keep a copy of the password somewhere safe before you lock the file.
No, encryption happens locally in your browser, so neither your document nor the password you choose ever leaves your device.