Every tool on this site runs entirely inside your web browser. When you choose a file, it is read into your browser's memory with the FileReader API and processed there by JavaScript and WebAssembly. The result is handed straight back to you as a download. Your file is never uploaded to a server.
Because the work happens on your own device, there is no round trip to a server: no upload wait, no file-size cap beyond your device's memory, and most tools keep working even with no internet connection once the page has loaded.
With a typical online PDF tool, your document is transmitted to and held on someone else's server, at least briefly. You are trusting that company's network, retention policy, and staff with the contents.
With local processing, the document never leaves your device, so there is simply no server-side copy to leak, retain, subpoena, or mishandle. For contracts, IDs, medical records, or financial statements, that is a categorical difference, not a matter of degree.
Heavy PDF operations are powered by mature open-source libraries compiled to WebAssembly so they run at near-native speed inside the browser: pdf-lib and MuPDF for editing and rendering, pdf.js for parsing, and Tesseract for OCR. WebAssembly gives the predictable performance these tasks need without sending anything to a server.
The engines load on demand the first time you use a tool that needs them, then your browser caches them — which is why the first OCR or compression in a session has a brief loading step and later ones do not.
Two layers back the promise. A strict Content Security Policy restricts where the page may connect, and a runtime network guard wraps the processing pipeline so file data cannot be sent anywhere. No account is required and no document content is collected.
Our hosting may keep standard aggregated access logs (such as IP address and requested URL) for security and reliability — these never contain your file contents.
Yes. Because the file is processed locally and never uploaded, confidential documents — contracts, IDs, medical or financial records — stay entirely on your device. There is no server copy that could be exposed.
Local, browser-based tools are safer for anything sensitive, because the file never leaves your device. Cloud tools upload your file to a server you cannot fully audit. Cloud tools still make sense for very heavy server-side jobs or low-powered devices, but for everyday editing of a private document, local processing removes the risk entirely.
Yes — and you do not have to take our word for it. Open your browser's developer tools, switch to the Network tab, and use any tool. You will see that no request carries your file's contents to a server while the tool works.