Encrypt PDF — Free Online PDF Tool
Password-protect your documents. Free, no watermarks, no upload — your files never leave your browser.
PDFisPDF processes everything locally in your browser using WebAssembly. No data is ever uploaded to a server — your files never leave your device.
Frequently Asked Questions
- What encryption does PDFisPDF use?
- PDFisPDF uses RC4-128 encryption (PDF Standard Security Handler, revision 3) as defined in the PDF 1.7 specification.
- Can I set different user and owner passwords?
- Yes. The user password is required to open the PDF. The optional owner password controls editing permissions.
- Is the encryption done locally?
- Yes. Encryption happens entirely in your browser. Your file and password never leave your device.
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