Protect PDF

Add password protection to your PDF document for secure sharing.

Your files are processed entirely in your browser. Nothing is uploaded to our servers.

About Browser-Based PDF Encryption

The pdf-lib library used here does not support full AES encryption. This tool prepares and saves your PDF with your chosen password stored in document metadata. For strong encryption, after downloading, use Adobe Acrobat, Preview (Mac), or run: qpdf --encrypt USER OWNER 256 -- input.pdf output.pdf

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