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Protect PDF

Encrypt PDFs with AES-256 and a password. Optionally restrict printing, copying and editing.

Select PDF files

Your files stay on this device. Processing happens in your browser — no upload, no size limit.

How to use Protect PDF

  1. Select or drop your PDF file. They are opened locally in your browser — nothing is uploaded.
  2. Choose your options for Protect PDF, then start. The work runs on your own device.
  3. Download the result, or pass it straight to another tool.

Frequently asked questions

Is Protect PDF safe for confidential documents?

Yes. Your files are processed entirely inside your browser and are never sent to a server, so there is nothing to intercept, store or leak.

Is there a file size or file count limit?

No. Because your own device does the work, the only limit is your device’s memory — there are no paywalled caps or daily quotas.

Does it work offline?

Yes. Once the page has loaded you can disconnect from the internet and keep working.

Related tools

Digital signatureSign PDFs with a certificate (.p12/.pfx) or a self-signed one — a cryptographic signature that shows if the document is changed later.Verify signaturesCheck the digital signatures in a PDF: who signed it, when, and whether anything changed afterwards.Smart RedactAutomatically find and permanently remove names, phone numbers, emails, bank accounts and ID numbers — detected on your device, never uploaded.Redact PDFPermanently remove sensitive text and images. Search-and-redact or draw boxes — truly destroyed, not just covered.Unlock PDFRemove password protection and restrictions from PDFs you have the password for.Metadata cleanerSee and strip hidden metadata (author, software, dates, XMP) before sharing — or edit it.