The Architecture of Local-Only PDF Processing
Most online converters require you to transmit confidential contracts, tax returns, and medical records over the internet to their servers. Here is how Best Free PDF Tools guarantees total security:
- Isolated Memory Processing: When you select a document, the HTML5 File API loads the bytes into a JavaScript ArrayBuffer inside your browser’s isolated memory space.
- Background Web Workers: Heavy tasks like compression, rendering, and merging execute in dedicated background threads without sending any network requests.
- No Persistent Caching: We never write file contents to IndexedDB, LocalStorage, or cookies. When your session ends, the memory is purged immediately by the browser garbage collector.
- CSP Network Containment: Our Content Security Policy explicitly restricts network communication to prevent unexpected data exfiltration.