Discover why FreeConversion is the best free and private alternative to PDFZilla for compressing your PDFs.
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Last updated : May 14, 2026
Perpetual license at $19.95 — one-time payment
Windows desktop software
Solid, well-tested basic tools
Windows only — no Mac, no Linux, no mobile
Interface looks like 2010s, no recent refresh
No web version — you install a .exe
Limited features: compression and conversion only
Runs on Windows, Mac, Linux, ChromeOS, iOS, Android — anything with a browser
No installation, no .exe
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.
Yes, our PDF compressor is completely free. No hidden fees, no registration required, and no file size limits.
Currently, you can compress one file at a time. However, the process is very fast and you can compress as many files as you want consecutively.
Low compression (10-30% reduction) preserves maximum quality. Medium (30-50%) offers a good balance. High (50-70%) significantly reduces size with slight image quality loss. Maximum (70-90%) creates the smallest possible file.
Absolutely! FreeConversion is perfect for professional documents. Since all processing happens locally in your browser, your confidential documents remain 100% private.
The free and private alternative to PDFZilla. No limits, no registration.
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