Who operates the site
GuideHollow Sheets is maintained by emfls through the public GitHub project. Contact lists the operator's email and public issue tracker.
CSV Duplicate Checker
File selection, UTF-8 decoding, parsing, comparison and export happen in your browser. The tool does not upload your CSV or send its cells to a backend, database, AI service or analytics endpoint. Its data is held in page memory; use Reset or reload to clear the session. Your browser or extensions may independently restore form text.
Downloaded files are stored on your device. Spreadsheet programs may reinterpret their values when opened. Local processing does not prevent another device user, browser extension or clipboard application from accessing information on your device.
Formula Finder and copying
The Finder filters a static reference library. It does not call Excel, Google Sheets or an AI service. Copy buttons write the selected example to your clipboard when permitted. We do not receive your clipboard contents.
Search and hosting
Search fetches a static index from this site and filters it locally. Search terms appear in the page URL and may therefore appear in browser history, shared links and hosting request logs. Do not enter confidential information in search.
GitHub Pages serves this site and may process technical request data, including IP addresses, for operation and security. GitHub controls that processing and retention; see its privacy statement.
Cookies, advertising and analytics
The site does not intentionally set cookies or localStorage entries, run analytics, load third-party fonts, or request advertisements. We have not copied the main GuideHollow site's AdSense Publisher ID or verification tags. If these practices change, this notice and any applicable consent choices must be updated before activation.
External links and correspondence
Official documentation and GitHub links lead to external services with their own policies. A GitHub issue is public and associated with your GitHub account. Email is processed by the sending and receiving email providers; the operator receives the address, message and attachments you choose to send. Only send information needed for the request.
For a question about handling or removal of correspondence, use the private email route on Contact. This site has no user accounts, contact form, mailing list or comments.
Your choices
You can read the articles without JavaScript. JavaScript enables interactive CSV processing, Finder filters, search, copy buttons and the mobile menu. You may avoid external links, clear form inputs, remove downloaded files and control browser storage or extensions through your device settings.