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Protect

Protect PDF

Apply password-based protection to a PDF.

Processed on your device

How it works

Three simple steps.

  1. Select the PDF.
  2. Type a password and type it again to confirm.
  3. Download the protected PDF. It will ask for the password whenever it is opened.

Security and privacy

Your file is processed right here in your browser.

The code that does the work runs in your browser, so your document never leaves your phone or computer. Nothing is uploaded and nothing is kept after you close the page. You can check: once your file is open, switch on airplane mode and the tool still finishes.

Frequently asked questions

How do I put a password on a PDF?
Select your PDF, type a password of at least 8 characters twice, and download the protected PDF. Anyone who opens it will need that password.
How strong is the protection?
The PDF is locked with AES-256 encryption, the strongest standard PDF protection. Use a password that is hard to guess.
What if I forget the password?
It cannot be recovered, not even by us, because the password never leaves your device. Keep it somewhere safe.
Is my file uploaded anywhere?
No. Your file is processed by your own browser on this device. It is never sent to a server, and nothing is kept after you close the page.
Is it free? Do I need an account?
Yes, it is free and there is no sign-up.

Related tools

On-deviceWatermark PDFAdd a text watermark to every page, in English, Hindi or other languages.
ArwaPDF

Free PDF tools that work on your device. Your files are never uploaded.

Organize pages
  • Merge PDF
  • Split PDF
  • Organize PDF
  • Rotate PDF
  • Delete PDF Pages
  • Extract PDF Pages
Convert
  • JPG to PDF
  • PNG to PDF
  • Image to PDF
  • PDF to JPG
  • PDF to PNG
Edit
  • Crop PDF
  • Resize PDF
  • Watermark PDF
  • Edit PDF
  • Sign PDF
  • Add Page Numbers
More tools
  • Protect PDF
  • Unlock PDF
  • Exam Photo & Signature Resizer
  • Compress PDF
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Files are processed on your device and never uploaded.