Guides/Encrypt PDF
How to encrypt pdf free — no upload, no watermark
Encryption is applied in the browser with @cantoo/pdf-lib. The password never leaves this tab. This guide is for ProMaxPDF on promaxpdf.pro. The file never leaves your browser — students and businesses use the same local engine.
- Open the tool. No account. The page loads the editor in your browser.
- Add files. Drop files onto the page. They are read locally and never uploaded.
- Encrypt. Set a password and download the protected file.
- Download. The result is saved to your device. Nothing is stored on a server.
FAQ
Which cipher?
AES-256 via the pdf-lib encryption fork.
Is the password sent anywhere?
No.
Forgot the password?
There is no recovery. That is the point of local encryption.