Password Protect PDF

Add a password to a PDF free, so only the right people can open it. Allypdf encrypts the file locally in your browser — neither the document nor the password you choose is ever sent anywhere.

How to password-protect a PDF with Allypdf

  1. Select the PDF you want to secure.
  2. Type the password you want to require.
  3. Encrypt the PDF locally in your browser.
  4. Download the password-protected file.

Why "no upload" matters here

It defeats the point of password-protecting a document if you first hand the unprotected version — and the new password — to an unknown server. That is exactly what most online protect-PDF tools require. Allypdf performs standard PDF encryption on your own device: the unprotected file and your chosen password exist only in your browser's memory, which is the right place for legal agreements, payroll files, and anything else worth locking.

Common uses

  • Lock a payroll or salary summary with a password before sharing it over email.
  • Protect a contract draft so only the counterparty with the password can open it.
  • Password-protect scanned ID documents before storing them in cloud storage.
  • Secure board papers before distributing them to a mailing list.

Frequently asked questions

How do I password-protect a PDF for free?

Open the Protect PDF tool, choose your file, type a password, and click Encrypt — the protected PDF downloads immediately. It is free and requires no account.

Is my password sent to a server?

No. Both the file and the password stay in your browser; encryption is applied locally on your device before you download the result.

What kind of protection is applied?

The tool applies standard PDF password encryption, so the file prompts for the password in any normal PDF reader, including Adobe Acrobat, browser viewers, and mobile apps.

Can you recover the password if I forget it?

No. Because we never see your file or your password, there is nothing we could recover — store the password somewhere safe, such as a password manager.

Related tools

  • Unlock PDF — Remove a PDF password you know, free. Decryption happens in your browser — confidential files never touch a server.
  • Add a Watermark to PDF — Stamp a text or image watermark on every PDF page free. Watermarking runs locally in your browser for full privacy.
  • Flatten PDF — Flatten form fields and annotations into a single PDF layer. Free and private — flattening runs locally in your browser.