Protect PDF
Encrypt a PDF with a password (AES-256).
or drag and drop PDFs here
Files are processed on your device and never uploaded.
Working…
Your file is ready!
DownloadContinue with this file
To password-protect a PDF, select the file, type a password twice and click Protect PDF. The file is encrypted with AES-256 in your browser, so anyone opening it needs the password. You can also restrict printing, copying and editing.
How to protect PDF
- Select your PDF filesClick “Select files” or drop your PDF files on the page.
- Choose your optionsType the password twice and choose any restrictions.
- Click “Protect PDF”The result is created on your device in seconds and downloads automatically.
Frequently asked questions
How strong is the protection?
AES-256, the strongest standard PDF encryption. Use a long password: weak passwords can be guessed.
Is Protect PDF free?
Yes. Protect PDF on HappyPDF is completely free: no sign-up, no watermark and no daily limit.
Are my files safe?
Yes. Your files are processed inside your own browser and are never uploaded to HappyPDF’s server,, so nobody else can see them.
Does it work on phone, Mac and Windows?
Yes. It works in any modern browser (Chrome, Safari, Edge, Firefox, Samsung Internet) on Windows, macOS, Linux, Android and iPhone/iPad. Nothing to install.