PDF Studio

Protect PDF

Encrypt a PDF with a password (AES-256). Free, private and processed in your browser — files are never uploaded.

How to use Protect PDF in 4 steps

  1. Upload the PDF you want to secure.
  2. Type a password twice.
  3. Optionally block printing, copying or editing.
  4. Click "Protect PDF" and download the encrypted file.

When to use Protect PDF

Adding a password to a contract before emailing it, restricting a payroll document to authorised recipients, or securing a legal brief.

Key features

  • Open Password — Only people with the password can open the document.
  • AES-256 Encryption — The same encryption standard Adobe Acrobat uses — without the password the file can't be read.
  • Instant Application — Protection is applied in seconds in your browser.
  • No Account Required — Protect files without signing up or using a cloud service.
  • Permission Controls — Optionally block printing, copying or editing after the file is opened.

Frequently asked questions

How strong is the protection?

The PDF is encrypted with 256-bit AES — the same standard Adobe Acrobat uses. Without the password the content can't be read. Use a long password for best security.

Will it open everywhere?

Yes. Adobe Reader, Chrome, Edge, Firefox, macOS Preview and mobile PDF apps all ask for the password and then open the file normally.

What if I forget the password?

It can't be recovered — not even by us, because it never leaves your device. Keep an unprotected copy somewhere safe.

What do the print/copy/edit options do?

They ask PDF readers to block those actions after the file is opened. Reputable readers respect them, but they are weaker than the open password itself.

Can anyone else see my password?

No. The file is encrypted inside your browser, so the password is never sent, stored or logged anywhere — only people you give it to can open the PDF.

Works well with