How to protect PDF
- Add a PDF.
- Type a password twice, and choose what people can do once it’s open.
- Select Protect PDF and download the locked file.
Questions
How strong is the protection?
Files are encrypted with AES-256, the strongest standard PDF encryption. A long password with a mix of words and numbers is very hard to crack.
Do the print and copy restrictions always work?
Most PDF readers respect them, but they’re a request rather than a lock: some software ignores them. The password itself is what keeps the file private.
Are my files uploaded to a server?
No. UserPDF runs entirely in your web browser. Your files are read and processed on your own device and are never sent to us or anyone else. You can even disconnect from the internet after the page loads and the tools keep working.
Is it free?
Yes. UserPDF is free to use with no sign-up and no watermark on your files. It’s supported by ads.