Security

Password Protect PDF

Add a password to your PDF in your browser. Nothing is uploaded.

Drop PDF files here

or choose files

Files are processed in your browser. Nothing is uploaded.

Keep this password safe. PDF Plain cannot recover it after the file is downloaded.

    FAQ

    Can PDF Plain recover my password?

    No. Store it safely before sharing the protected PDF.

    Is this real encryption?

    Yes. The PDF is processed by QPDF running in WebAssembly in your browser.

    Are files uploaded?

    No. The file stays on your device.

    Can I protect an already encrypted PDF?

    Unlock it first, then apply a new password.

    Related tools

    Unlock PDFWatermark PDFMerge PDF