Protect PDF
Password-protect a PDF with AES-256 encryption so it can only be opened with your password. Optionally block printing and copying. Encryption happens in your browser using qpdf — the file and the password never leave your device.
Your files never leave your device.
How to use the Protect PDF
- 1Choose a PDF.
- 2Enter a password (twice) and choose whether to allow printing and copying.
- 3Click “Protect PDF” and download the encrypted file.
What is the Protect PDF?
The PDF is encrypted with AES-256, the strongest standard encryption in the PDF specification, using qpdf compiled to WebAssembly. Without the password the content cannot be read.
There is no way to recover a forgotten password — keep a copy of the unprotected original or store the password in a password manager.
Frequently asked questions
How strong should the password be?
Use at least 12 characters or a 4–5 word passphrase. Short passwords can be guessed by offline cracking tools.
Are printing and copying restrictions secure?
They are honoured by mainstream PDF readers but are not encryption — some tools ignore them. Only the open password truly protects the content.
Is the Protect PDF free and private?
Yes. The Protect PDF is free, needs no account, and processes your files entirely in your browser. Files are never uploaded to a server or stored.
Related tools
All pdf tools →- Unlock PDFRemove the password from a PDF you can open.
- Watermark PDFStamp text like CONFIDENTIAL or DRAFT on a PDF.
- Sign PDFDraw or type a signature and place it on a PDF.
- Compress PDFReduce PDF file size in your browser.
- Password GeneratorGenerate strong, random passwords.
- Merge PDFCombine multiple PDF files into one.