Add AES-256 encryption to a PDF in your browser. Real encryption, done on your own machine. Your file never leaves this page. Everything happens in your browser, and there is no upload endpoint to send it to — that is checked by a build gate that fails if any network code reaches a tool’s bundle.
How to do it
- Drop your PDF onto the box.
- Type the password that will be needed to open it.
- Protect the file and download.
Questions
What is the difference between the two kinds of password?
One is required to open the file — that is real encryption, and without it the document cannot be read at all. The other only restricts actions such as printing and copying, and those restrictions are a request to the viewer rather than a lock. Many viewers honour them; some do not.
What happens if I forget it?
The file is gone. Nothing is uploaded here, so there is no copy of your password anywhere, no account and no reset link — and AES-256 with a decent password is not guessable. Write it down somewhere you will find it.
Is this real encryption?
Yes — AES-256, which is the only algorithm the current PDF standard recommends. The older ciphers some tools still offer are broken, and are not offered here.
Can I stop people copying the text?
You can ask. It is a flag in the file, and a viewer is free to ignore it — and a screenshot with any OCR tool defeats it in any case. Blocking text extraction also blocks screen readers, so it is worth being sure it is what you want.