Add real AES-256 encryption to a PDF so it cannot be opened without the password. The file and the password both stay on your device.
1Choose the PDF you want to lock
2Set a password and decide what readers may do
3Download the encrypted file
Drag & drop your file
or click to browse
Accepts: PDF
Processed locally — your files never leave this device
Encryption That Does Not Require Trusting a Server
Uploading a confidential document to a website in order to protect it defeats the purpose. ModiFyX encrypts it in your browser, so nothing is ever transmitted.
Real AES-256 EncryptionGenuine PDF encryption written by qpdf — not a viewer flag anyone can ignore.
The Password Never LeavesEncryption happens in your browser, so neither the file nor the password is transmitted.
Permission ControlAllow or block printing, copying text and editing independently of opening.
InstantA typical document is encrypted in well under a second.
Opens AnywhereStandard PDF encryption, so Acrobat, Preview and every browser reader accept it.
Nothing StoredClose the tab and no trace of the document or the password remains.
