Compress PDF files online for free. Reduce PDF size up to 80% while maintaining quality. Fast, secure, browser-based compression — no files ever leave your device.
Yes. ZypFile compresses PDFs entirely inside your browser using WebAssembly. Your files are never uploaded to any server, so your data stays completely private.
Depending on the content, you can typically reduce PDF file size by 40–80%. PDFs with high-resolution images benefit the most from compression.
ZypFile uses smart compression that balances quality and file size. You can adjust the compression level to keep quality acceptable for your use case.
There is no hard server limit since processing happens in your browser. Very large files (>500 MB) may be limited by your device's available memory.