PDF Link performs document processing entirely in your browser using modern JavaScript libraries such as pdf-lib and jsPDF. When you upload a file, the site reads it using the browser File API and converts it to an in-memory binary representation. Transformations — merging, splitting, watermarking — are performed locally, and the resulting PDF is generated and downloaded to your device.
Because files are processed client-side, they are not transmitted to external servers. This reduces privacy risks and keeps your documents under your control.