Your files stay in the tab

The checker reads selected files or pasted CSV text in your browser and processes it in a local Web Worker. Application code does not upload file contents, filenames, coordinates or results. No account is required.

What is stored

Inputs and reports are held in page memory. This app does not use cookies, local storage, IndexedDB, service workers or a saved check history. Clear files and results removes the current inputs and reports from the app state. Closing the tab ends that state. Browser extensions, browser crash recovery and your operating system are outside the app's control.

Downloaded reports are new local files under your browser's download behavior. JSON can include exact source values in issue evidence. CSV neutralizes formula-like issue fields with a leading apostrophe for safer spreadsheet viewing. You control where those downloads are stored and shared.

Ordinary web requests

Loading the site requests its HTML, self-hosted fonts, scripts and styles from the static host. Hosting infrastructure may process ordinary request information such as IP address, requested public path and user agent. Private check state is never added to URLs. The production operator's hosting log configuration has not been verified in this local build.

No third-party scripts

This processor includes no analytics, advertising, tracking pixels, remote fonts or remote inference calls. External source and publisher links open their respective websites only when followed. Their privacy practices apply there.

Publisher information and disclosures are maintained separately. Reviewed October 31, 2026.

Production hosting

These pages are hosted through ChatGPT Sites on Cloudflare. Hosting may set security cookies such as __cf_bm and process ordinary request metadata to protect and deliver the website. These hosting functions are separate from the application and do not receive the files or worksheet inputs processed locally. Hosting notice reviewed November 1, 2026.