How PDFagain protects your data through complete isolation and client-side processing.
"Your Data Never Leaves Your Device"
Unlike traditional PDF services that require uploading files to a remote server for processing, PDFagain operates entirely within your web browser. The PDF manipulation code downloads once to your device and runs locally. This means there is no "cloud" component that sees your files at all.
We utilize advanced browser technologies to deliver native-application performance in a secure web environment:
High-performance C++ libraries compiled to run locally in your browser at near-native speed.
Processing in background threads keeps the UI responsive and fully isolated.
Strict browser-level code isolation prevents any access to your file system.
Data exists only in RAM. Closing the tab instantly and permanently wipes it.
If you discover a vulnerability in our application logic, please report it immediately.
Updated: Feb 13, 2026