Protect PDF
Add a password to a PDF with AES-256 encryption, and choose whether people can print, copy or edit it.
Your PDF and password stay in your browser — nothing is uploaded. The first run downloads the PDF engine (about 1.3 MB).
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How to use this tool
- 1Choose the PDF you want to protect.
- 2Enter a password and type it again to confirm.
- 3Choose whether people who open it can print, copy or edit.
- 4Click Protect PDF and download the encrypted file.
Features
- AES-256 encryption, the strongest standard PDF encryption.
- Control printing, copying and editing permissions.
- Works in Adobe Acrobat, browsers, Preview and other PDF readers.
- Handles PDFs up to 100 MB.
- Your file and password never leave your browser.
Privacy
Your PDF and password stay in your browser — the encryption runs locally with qpdf compiled to WebAssembly. The first run downloads the PDF engine (about 1.3 MB).
Frequently asked questions
How strong is the protection?
Files are encrypted with AES-256. With a long, unique password, the content can’t realistically be opened without it.
What happens if I forget the password?
It can’t be recovered — not by us or anyone else. Keep a copy of the original file or store the password in a password manager.
What do the print and copy permissions do?
They tell PDF readers what someone may do after opening the file with the password. Most readers respect them, but they are a deterrent rather than a guarantee.
Can I protect a PDF that already has a password?
Unlock it first with Unlock PDF, then add the new password here.
Guides
- How to Password-Protect a PDF for Free
Sending a contract, payslip or medical record? Here's how to add a password to a PDF with AES-256 encryption, set print and copy permissions, and share it safely.
- How to Remove a Password From a PDF You Own
Tired of typing a password every time you open a bank statement? Here's how to remove a PDF password, or print and copy restrictions, from files you own.
- How to Compress a PDF to Fit an Email or Upload Limit
PDF too big to email or upload? Here's how to shrink it for free in your browser, which compression level to pick, and what to do if it's still too big.