Last updated: September 27, 2026
Unlike traditional web tools websites that upload your files, passwords, and sensitive text to remote servers, Vesso runs the vast majority of utilities 100% locally inside your web browser using modern HTML5 Canvas, Web Cryptography, and WebAssembly APIs. Your private data never leaves your device.
When you bookmark a tool as a favorite or access recent utilities, we save those preference identifiers strictly inside your browser's local storage (localStorage). This data is completely private to your device and is never synchronized to our servers.
For network diagnostic utilities (such as HTTP Status Checker, Redirect Chain Checker, and SSL Certificate Inspection), our server must execute a network request to the public domain you specify. These requests: