Help center
Protect— help & troubleshooting
Set a password & permissions.
Open Protect →- How to password-protect a PDF in your browserAdd an open password and AES-256 encryption with print, copy, and edit permissions to a PDF using AttachKit's Protect tool, entirely in your browser.
- Protect troubleshooting: already-encrypted files, invalid PDFs, and permissions that don't stickFixes for common problems when password-protecting a PDF in AttachKit, including already-encrypted files, corrupt PDFs, the 100 MB limit, engine load errors, and viewers that ignore permission flags.