Protect PDF Online Free

Drag and drop your PDF here, or choose a file. Your file stays on your device whenever this tool can run locally in your browser.

By using pdfcat, you agree to process your file locally and securely in your browser.

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Private by design

This tool processes files locally in your browser whenever supported.

Add password protection to a PDF with a browser-first workflow and a clear download flow.

pdfcat does not add a watermark to your completed file.

Common questions

How do I protect PDF files?

Upload the required file, choose the options for Protect PDF, preview the result, and download the finished file.

Is Protect PDF free?

Yes. pdfcat requires no account and does not add a watermark to the finished file.

Does pdfcat upload my file?

This tool runs in your browser whenever the required capability is supported. Any hosted processing is clearly identified before upload.