Discover why FreeConversion is the best free and private alternative to PDFZilla for merging your PDFs.
Select multiple files to join them into one.
Add PDFs to merge
🔒 100% Secure • Local Processing
Last updated : May 14, 2026
Perpetual license at $19.95
Basic but functional merge tool on Windows
Windows only — no Mac, Linux, mobile
No web version — .exe install required
Windows XP/7 era UI
No major updates in a long time
Runs on any OS through a browser
No .exe install
Modern interface maintained regularly
PDFZilla (https://www.pdfzilla.com) is a popular tool, but it has significant limitations. The main difference with FreeConversion is privacy: unlike PDFZilla which sends your files to remote servers, FreeConversion processes everything locally in your browser using WebAssembly technology.
This means your sensitive documents (contracts, resumes, bank statements) never leave your computer. Additionally, FreeConversion is 100% free with no file limits, no registration, and no ads.
Absolutely! FreeConversion is perfect for professional documents. Since all processing happens locally in your browser, your confidential documents remain 100% private.
FreeConversion handles large files directly in your browser. The limit depends mainly on your device's memory, but files up to 100MB are processed without issues.
The free and private alternative to PDFZilla. No limits, no registration.
Compress my PDFs for free →