Yes. Protect PDF on ToolDock is completely free, with no sign-up, no watermark and no limits on how often you use it.

Are my files uploaded to a server?

No. Protect PDF runs entirely in your web browser, so your files never leave your device. It even keeps working if you go offline after the page has loaded.

Does it work on my phone?

Yes. It works in any modern browser on Android, iPhone, tablets, Windows, Mac and Linux.

Protect PDF with Password: free online tool

ToolDock Every tool. One place.

100% Private (Local)

Free PDF, image & developer tools, right in your browser

free online tools to convert, compress, and edit files. No sign-up, and your files never leave your device.

About Protect PDF with Password: free, private, in your browser

Encrypt your document to restrict unauthorized access.

How to use Protect PDF

Drop your PDF file into the box above, or click it to choose one from your device.
Check the preview and choose the options you want.
Click “Encrypt PDF”. The result downloads straight away.

Why use ToolDock

Private: your files are processed on your device and never uploaded.
Free: no account, no watermark, no daily limit.
Works everywhere: phone, tablet or computer, in any modern browser.

Questions

Is Protect PDF free?: Yes. Protect PDF on ToolDock is completely free, with no sign-up, no watermark and no limits on how often you use it.
Are my files uploaded to a server?: No. Protect PDF runs entirely in your web browser, so your files never leave your device. It even keeps working if you go offline after the page has loaded.
Does it work on my phone?: Yes. It works in any modern browser on Android, iPhone, tablets, Windows, Mac and Linux.

More PDF tools

PDF to Word Word to PDF Compress PDF PDF to Images Images to PDF Watermark PDF Merge PDF Split PDF Rotate PDF Reorder / Delete Pages All tools