Protect PDF

Add a password to encrypt and protect a PDF.

🔒Your PDF is encrypted with AES-256 — the same password is required to open it. Keep it safe: a protected PDF can’t be recovered without the password.
Help Us Improve
4.9 (0)

How to use Protect PDF

Three quick steps — no sign-up needed

  1. Step 1

    Upload the PDF

    Select the file you want to lock.

  2. Step 2

    Set and confirm a password

    Choose a strong password and confirm it carefully.

  3. Step 3

    Download the protected PDF

    Share the file separately from the password.

Related PDF tools

View all
Add Page Numbers Add page numbers to a PDF with position, font, size, colour and exclude options. Add Watermark to PDF Add text or image watermarks with position, opacity, rotation and tiling controls. Compare PDF Compare two PDFs side by side with synced previews and text-difference highlighting. Crop PDF Crop PDF pages by dragging a selection on a live preview for all or current pages. Edit PDF Metadata View and edit PDF title, author, subject, keywords and dates, or strip metadata. Excel to PDF Convert Excel spreadsheets to PDF. HTML to PDF Convert HTML files or webpage content to a downloadable PDF. JPG to PDF Combine JPG and PNG images into a single PDF.

About Protect PDF

Protect PDF encrypts a document with a password so casual recipients cannot open it without the key. Users searching "password protect PDF", "encrypt PDF", or "lock PDF online" need basic confidentiality before emailing sensitive files.

Upload a PDF, enter and confirm a password, then download the protected file. Share the password through a different channel than the file itself.

Password protection is a deterrent, not perfect security against determined attackers. For highly sensitive material, use stronger organisational controls and avoid unnecessary distribution.

Benefits of Protect PDF

Password encryption Limit who can open the file.
Safer email attachments Reduce accidental exposure.
Simple confirm step Avoid typos locking you out.
Browser-based protection No desktop Acrobat required for basic locks.

Frequently asked questions

What if I forget the password?

You generally cannot recover it - keep a safe record.

Is this bank-grade security?

It helps against casual access; threat models differ for high-risk data.

Can recipients edit the PDF?

Opening restrictions depend on how encryption is applied - assume protection focuses on opening.

Works on all readers?

Most modern readers support standard PDF passwords.

Remove password later?

Use Unlock PDF when you know the password.