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Password-protect a PDF — without uploading

Encrypt your PDF with a password, on your own device. Neither the file nor the password ever leaves your browser.

100% private — files never leave your device

How it works

  1. 1

    Drop the PDF you want to protect.

  2. 2

    Choose a password (and optionally a separate owner password).

  3. 3

    Download the encrypted PDF — viewers will ask for the password to open it.

Related tools

Unlock PDFRemove a password you know — it never leaves your browser.Merge PDFCombine multiple PDFs into one file, in your chosen order.Split PDFExtract pages or page ranges into separate PDF files.Rotate & ReorderRotate, reorder, and delete pages with a visual page grid.

Frequently asked questions

Is my password sent anywhere?

No. The password and the file are processed entirely in your browser by Ghostscript WebAssembly. Nothing leaves your device.

How strong is the encryption?

128-bit RC4 (PDF encryption revision 3) — the strongest this engine supports. It's compatible with every PDF viewer and stops casual access, but it is not modern AES-256; for highly sensitive material use a dedicated encryption tool.

What's the difference between the open password and the owner password?

The open (user) password is required to view the document. The optional owner password separately controls permissions; if you leave it empty we use the open password for both.