OurPDF

Encrypt PDF – Free, No Upload

Password-protect PDFs with strong encryption. 100% free, files never uploaded, no sign-up.

Runs in your browser · files never leave your device

How to use Encrypt PDF

  1. 1

    Choose your PDF (or drop it on the page).

  2. 2

    Enter a password and choose permissions.

  3. 3

    Download the protected or cleaned PDF.

  • 100% in your browser – no upload
  • Free, no sign-up, no watermark
  • Works offline once loaded
  • Part of 67 private PDF tools

Questions & answers

How strong is the encryption?

AES-256, the strongest standard PDF encryption, supported by Adobe Acrobat and all modern readers. AES-128 is available for older readers.

Is Encrypt PDF free?

Yes, completely free with no limits on the number of files and no watermark.

Are my files uploaded to a server?

No. Everything runs in your browser on your own device. Your documents are processed locally and never leave your computer or phone.

Does Encrypt PDF work on mobile?

Yes. It works in any modern browser on Android, iPhone, Windows, macOS and Linux. Security & Privacy tools also work offline after your first visit.

Password-protect PDFs with strong encryption. 100% free, files never uploaded, no sign-up. OurPDF does this entirely inside your browser: nothing is uploaded, there is no account and no watermark.