Process sensitive PDF files directly on your own device. No remote uploads, no cloud data exposure, and no third-party storage risks.
Your files are never uploaded to our servers — all compression happens right inside your browser
or pick several files at once from your device
Standard online PDF tools transmit your documents across the public internet to third-party cloud servers where they may sit in temporary buckets or logs. Kompres PDF operates 100% in your browser using client-side JavaScript and WebAssembly — your document bytes never touch our server.
Whether you are shrinking financial audits, tax records, medical histories, legal contracts, or identity documents, client-side processing guarantees your data stays under your physical control and complies with strict internal privacy policies.
Because the compression engine runs in modern desktop and mobile browsers (Chrome, Safari, Firefox, Edge), you don't have to install unverified desktop software or browser extensions that request broad filesystem access.
Processing speed is determined by your device's available CPU and RAM. Because no cloud cluster is crunching the file, extremely large documents (e.g. 500+ pages) may take several seconds to process on older hardware.
You can open your browser's Developer Tools (Network tab) while compressing a document. You will see that zero POST or upload requests containing your file data are made to any remote server.
Yes. Once the web application code and web workers are loaded in your browser cache, the compression algorithm executes entirely offline in your local memory.
No. The document resides only in transient memory during active processing and is immediately discarded when you clear the queue or close the tab.