Browser-based processing means a web page uses JavaScript to read a selected file and perform an operation on the device. The site may not need to send the file to its own processing server.
What still uses the network?
The browser must download website code, PDF libraries, and possibly fonts or OCR language data. Third-party CDNs receive normal web requests. Hosting providers may also keep ordinary access logs.
Local processing is not a security certification
Local processing can reduce the need to transmit a document to an application server, but it does not make a device secure, protect a compromised browser, or guarantee that the document is safely redacted. Use approved systems for regulated or confidential workflows.
Editorial note: Tool behavior may change as the site is updated. Always follow the limitation notice shown on each tool page.