What happens when someone opens a protected PDF?

Their PDF reader asks for the password you set. Without it the document cannot be opened or read. Make sure you remember the password — it is not stored anywhere.

Is the password uploaded anywhere?

No. Encryption happens entirely inside your browser using the Web Crypto API. Nothing leaves your device.

How do I use the Protect PDF tool?

Open the Protect PDF tool, upload your file or paste your input, adjust the available options to your needs, then run the tool and download or copy the result. No account or installation is required.

Protect PDF

Apply standard PDF encryption with a password of your choice. Anyone who wants to open the file will need to enter it — keep it safe, because it cannot be recovered from the file.

Private processing: this pdf tool runs entirely in your browser — your files never leave your device.

Drop a PDF here to password-protect

Click to browse · drag & drop supported

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How to use Protect PDF

1Upload or provide your input
2Adjust the available options to your needs
3Click the main action button
4Wait a moment while the tool processes
5Download or copy your result

Frequently asked questions

Suggested from shared category and tags

Unlock PDF

PDF

Remove the password from a PDF you own and are entitled to unlock.

Merge PDF

PDF

Combine multiple PDF files into a single document in your chosen order.

Split PDF

PDF

Split a PDF by page ranges, hand-picked pages or fixed intervals.

Compress PDF

PDF

Reduce PDF file size with three compression levels and see exactly how much you saved.

From the blog

Guides and tips that feature this tool.

PDF Guides

How to Merge PDF Files Online for Free

A step-by-step guide to combining multiple PDF files into one document online — free, private and without installing any software.