PDF tools that respect your privacy
We built LumioPDF with one radical idea: your files should never have to leave your device just to get work done. Everything runs in your browser. Always free. Always private.
Professional PDF tools shouldn't cost your privacy — or your money.
Most online PDF tools ask you to upload your files to their servers. That means your confidential contracts, medical records, financial documents, and personal files are sitting on someone else's machine — and you have no idea what happens to them next.
LumioPDF takes a different approach. By leveraging the power of modern browsers and WebAssembly, we run the entire PDF engine directly on your device. Your files are processed locally, download to your device instantly, and nothing ever touches our servers.
This isn't just a feature — it's our entire philosophy.
Built on principles, not promises
Every decision we make comes back to four core values.
Privacy by Design
Your files never leave your device. All processing happens locally in your browser using WebAssembly and modern web APIs — not on our servers.
Blazing Fast
No upload delays, no server queues. Because your files stay local, processing is near-instant regardless of your internet speed.
Always Free
Core PDF tools are free forever. No hidden limits on file size, no paywalls on essential features. We believe great software should be accessible to everyone.
Works Everywhere
From any device, any browser, any OS. No installation, no plugins, no account required. Just open the browser and start working.
A full toolkit, completely free
From merging to compressing, converting to protecting — all the tools you need, all in one place.
How our privacy works
Ready to get started?
Join millions of users who trust LumioPDF to handle their PDFs privately and for free.