I don't want to upload my documents to online services. So I compress PDFs directly in the browser

The author faced the need to compress PDF documents for an embassy application while raising privacy concerns regarding third-party online services. Existing solutions either failed to provide the necessary quality or required uploading files to a server. In response, a tool was developed that works exclusively in the browser using client-side technologies. Files are processed locally on the user's device, preventing transmission to external servers, and the application can function offline after the initial load. The article details the project's technical implementation, compares it with Ghostscript, and explains security verification methods that allow users to confirm that data never leaves their device. This solution offers a convenient alternative for those who prioritize privacy when handling sensitive documents on smartphones and computers.