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 your PDF

    Drag and drop your PDF into Protect PDF, or click to browse.

  2. Step 2

    Choose your options

    Adjust the settings to get exactly the result you want.

  3. Step 3

    Download

    Download the finished file in seconds — processed securely.

Related PDF tools

View all
Add Page Numbers Add page numbers to a PDF with a live preview — choose position, style, font and more. Runs entirely in your browser. Add Watermark to PDF Add a text or image watermark to your PDF with a live preview — position, opacity, rotation, tiling and per-page control. Runs in your browser. Compare PDF Compare two PDFs side by side with synced previews and per-page text-difference highlighting. Runs in your browser. Crop PDF Crop PDF pages by dragging a selection over a live preview — apply to all pages or just the current one. Runs in your browser. Edit PDF Metadata View and edit PDF metadata — title, author, subject, keywords and creation date — or strip all metadata. Runs in your browser. Excel to PDF Convert Excel spreadsheets to PDF. HTML to PDF Convert any HTML file or webpage content to a downloadable PDF document. JPG to PDF Combine JPG and PNG images into a single PDF.

About Protect PDF

Protect PDF is a free online tool that lets you add a password to encrypt and protect a pdf — straight from your browser, with no software to install, no sign-up, and no watermarks. It runs on Windows, Mac, Linux, Android, and iOS, so you can use it on whatever device you happen to have to hand.

Protect PDF is built to make pdf tasks quick and painless, with a clean interface that anyone can use straight away. Files and data are processed securely and removed automatically afterwards, and many steps run entirely on your own device for extra privacy. Because Protect PDF is completely free and unlimited, you can use it as often as you need for work, study, or personal projects.

Benefits of Protect PDF

Fast & accurate Protect PDF does the job in seconds with results you can rely on.
Simple to use A clean, focused interface means anyone can add a password to encrypt and protect a pdf without a manual.
Free & unlimited Use it as often as you need — no fees, no caps, no watermarks.
Works everywhere Runs in any modern browser on desktop, tablet and mobile.

Frequently asked questions

How do I use Protect PDF?

Open Protect PDF, follow the simple steps on the page, and get your result in seconds — everything happens online in your browser.

What can I use Protect PDF for?

Add a password to encrypt and protect a pdf for work, study or personal projects — Protect PDF is built to make pdf tasks quick and painless.

Does Protect PDF work on mobile?

Yes. Protect PDF runs in any modern browser, so it works the same on phones, tablets and computers with nothing to install.