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Encrypt PDF files

Secure your PDFs effortlessly with our state-of-the-art encryption webapp. Apply robust encryption to your PDF files directly on your local machine, ensuring utmost data privacy and security. No need for uploads, offering a quick, reliable, and user-friendly solution. The best choice for protecting sensitive documents.


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Works without installation!

PDFTool lets you encrypt PDF files directly in your browser. You do not need to install a big application or upload the files to the cloud.

How does this work?

We encrypt your PDF files directly in the browser, this ensures privacy for your documents, the only secure way to do this. PDF encryption in the browser is available for all systems like Windows, Mac and Linux as well as Android, iOs and iPad Devices.

Can I encrypt PDF files without internet?

Yes! Open PDFTool, select encrypt and deactivate your internet connection - the application works fully offline.

How to encrypt PDF files online?

  1. Add a document by pulling it into the designated area or by clicking on the same area.
  2. After adding the file, you can enter the password that you want to use.
  3. Enter the password one more time to make sure that it is correct.
  4. Save your new PDF by clicking the button below.


This PDF encryption tool allows you to securely modify PDF files without an internet-connection. You can turn off your Internet-Connection and still encrypt PDF files locally.

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