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Protect PDF

Add a password to a PDF so only people you give it to can open it.

  • Free
  • No sign-up
  • Runs in your browser
  • Up to 100.0 MB · 30 at a time

Drop your PDF here

or pick them from your device

  • PDF
  • up to 100.0 MB
  • 30 at a time

This runs on your device. Your files are never uploaded.

How it works

Choose a password and the PDF is encrypted with AES-256, the strongest standard PDF encryption — it cannot be opened without the password. You can also stop people printing, copying text or editing it; most PDF readers respect those settings. The password never leaves your device: the file is encrypted in your browser and nothing is uploaded. Keep the password safe — it cannot be recovered.

Formats and limits

Accepts
Outputs
Max size
100.0 MB
Per batch
30 files

Your privacy

This tool runs entirely in your browser — your files are never uploaded, whatever their size. No account is needed.

Password protect a PDF online, free. Add a password with AES-256 encryption and, if you like, stop printing, copying or editing. It all happens in your browser — your file and your password are never uploaded.

AES-256, the strongest PDF encryption

Your PDF is encrypted with 256-bit AES, the strongest encryption the PDF format supports. Without the password, the contents cannot be read — not just hidden behind a prompt.

Your password never leaves your device

Encryption happens in your browser. Neither the document nor the password is uploaded, so there is nothing stored anywhere that could leak.

How to use Protect PDF

  1. 1Choose one or more PDFs.
  2. 2Type the password, and choose whether to allow printing, copying and editing.
  3. 3Press Protect — the PDF is encrypted in your browser.
  4. 4Download the protected PDF and share the password separately.

When to use Protect PDF

  • Emailing bank statements, contracts or medical records safely.
  • Sharing payslips or HR documents that only one person should read.
  • Sending a proof a client can read but not print or copy.

Tips

  • Send the password by a different route than the file — a message rather than the same email.
  • Keep a copy of the password: it cannot be recovered if it is lost.

Frequently asked questions

Is my PDF or password uploaded?

No. Both stay on your device; the encryption runs in your browser.

How strong is the protection?

AES-256, the strongest standard for PDFs. A long password of several words is very hard to guess.

Do print and copy restrictions always work?

Most PDF readers respect them, but they rely on the reader. The password itself is what truly keeps the file private.

What if I forget the password?

It cannot be recovered — keep your original unprotected copy somewhere safe.