Merge PDF securely with zero-trust encryption
Combine multiple PDF files into one document instantly. 100% client-side processing, files never leave your device. 100% client-side processing. Files never leave your device.
Start Now - FreeHow It Works
Why Choose MendPDF?
All files processed locally. Nothing uploaded to any server
Local WebAssembly processing keeps your files on your device
No document data collected by servers for local tools
Frequently Asked Questions
How do I merge PDF files online for free?
Simply drag and drop your PDF files into MendPDF's merge tool. All processing happens locally in your browser — no uploads, no servers, completely free.
Is it safe to merge PDFs online?
Yes. MendPDF uses 100% client-side WebAssembly processing. Your files never leave your device. This zero-trust architecture means there's zero risk of data breaches.
Can I merge PDFs on Mac and Windows?
Absolutely. MendPDF works on any modern browser including Safari, Chrome, Firefox, and Edge on both macOS and Windows.
Zero-Trust Architecture
MendPDF uses 100% client-side WebAssembly processing. Files never leave the device. Zero-Trust architecture. No server uploads. All PDF manipulation happens locally in your browser, ensuring complete data privacy and security.