PDF Encrypt locks a document with an open password so only people who know it can view the file. Optionally set a separate permissions password to block printing or copying. Encryption happens locally with pdf-lib — your file and password never leave the device.
Your data is processed entirely in your browser. Nothing is uploaded to any server.
Yes, all PDF tools are free and run in your browser.
No. Your PDFs are processed locally on your device and never leave it.
Very large files may be slower because processing happens on your device, but there is no hard upload limit.
No account or signup is required.