Security & Privacy Architecture
Most online PDF tools upload your sensitive documents to their cloud servers. We designed a fundamentally different architecture: Zero Trust, Local Processing.
How Your Data Stays Local
1. No Network Uploads
When you select a file on freepdf.lol, it is loaded directly into your browser's local memory (RAM) via the File API. There is no HTTP POST request sending your file to an API endpoint. You can verify this by opening your browser's Developer Tools (Network tab) while processing a file.
2. WebAssembly Processing
Instead of sending files to a server equipped with PDF manipulation software, we send the software to you. We compiled robust C/C++ libraries (like QPDF and Ghostscript equivalents) into WebAssembly (Wasm). This code executes securely within your browser's sandbox.
3. Ephemeral Storage
Files are held in transient memory (ArrayBuffers). We use IndexedDB for large file processing to prevent browser crashes, but this database is strictly local to your device and is cleared automatically when you refresh or close the tab.
Regulatory Compliance Advantages
Because data never leaves the client's device, using freepdf.lol drastically simplifies compliance for organizations handling sensitive data:
No PII is transmitted or processed on our infrastructure. We are not a data processor of your files.
ePHI remains entirely on the local machine, eliminating the need for a BAA with our service.