Encrypt multiple PDFs at once.
Drag in one file or a folder of PDFs and process the queue with progress for each document.
Open source macOS app | v1.0.0
MarkPDFLock
Password protect one PDF or a whole batch, set printing and copying permissions, and keep every document local on your Mac.
Features
Built for quick, private PDF protection.
Set open and owner passwords.
Use one password for simple sharing, or add a separate owner password for permission control.
Choose what recipients can do.
Control printing, copying, and modification rules before exporting the encrypted PDFs.
Keep documents on your Mac.
MarkPDFLock runs locally and saves new encrypted copies without editing the originals.
Screenshots
See the PDF locking workflow before you download.
App Flow
A focused workflow from files to encrypted copies.
Drop PDF files here
3 PDFs ready
Open password
Required
Printing
Allowed
Copying
Blocked
AES-256
Powered by qpdf encryption.
MarkPDFLock applies modern PDF encryption settings, then writes a separate encrypted file for each source PDF.
Workflow
Three steps, no account required.
1
Add PDFs.
Drag files into the app, choose individual PDFs, or add a folder.
2
Choose protection.
Enter the open password and decide whether printing, copying, or editing should be allowed.
3
Export encrypted copies.
Pick a folder and let MarkPDFLock save protected PDF copies there.
Privacy
No upload. No login. No tracking.
PDFs are processed locally on your Mac.
Passwords are used only for encryption.
Original files stay unchanged.
Download
Get MarkPDFLock from GitHub.
Download the macOS app from GitHub Releases. If macOS warns on first launch, right-click the app and choose Open.