Your file stays
in your browser.
The CSV checker and Workspace tools process selected files and pasted text locally. Selecting a file is not an upload.
CSV input and reports
The checker does not send file contents to an application server, save them in browser storage, or put them in a page URL. Input and results stay in the current page's memory and are discarded when it is reloaded or closed. Exported reports are saved through your browser and can contain original values, including sensitive information from your file.
If you use an AI browser integration to provide CSV text, that integration's own data handling also applies. The site's optional check_csv tool performs the same local check and returns selected findings to the calling agent. Do not give an AI service data you do not want it to receive.
Website hosting
Page and asset requests still reach the hosting provider, which may process ordinary connection information such as IP address, browser information and requested URL under its own policies. Local CSV processing does not mean browsing the website is anonymous.
We have not added an analytics service or an email collection form. Hosting access controls and browser extensions operate separately from our checker.
Saved tools and resources
Workspace can save the identifiers of tools, formulas and resources you bookmark in this browser’s local storage. These saved items contain links only, never file contents, pasted values, results or filenames. They do not sync between devices. Clear them from the Saved view or through your browser’s site-data settings. The tools remain usable if local storage is unavailable.
Excel Academy progress
Excel Academy keeps the identifiers of lessons you mark complete and your last visited lesson in this browser’s local storage. It does not store quiz answers, learner names or workbook contents, and does not sync between devices. Use Reset progress on the Academy overview to clear this checklist. If browser storage is blocked, you can still read every lesson and use its exercises.
Advertising and your choices
Our editorial guides include Google AdSense code. Ads depend on Google approving the site and making ads available. Google and its advertising partners may use cookies, device identifiers, IP addresses and browsing information to deliver, personalize and measure ads. We do not send CSV input or checker results to Google advertising. The checker, Workspace, Excel Academy, this privacy page and the guide directory do not include our advertising code.
For visitors in the European Economic Area, the United Kingdom and Switzerland, Google's consent message provides consent, refusal and options controls. When available, use the "Privacy and cookie settings" link at the bottom of a guide to revisit your choice. Blocking ads or declining personalization does not prevent reading our guides.
Learn how Google uses information from sites using its services, review Google's advertising policies for users, or manage personalization through My Ad Center. You can also delete or restrict cookies in your browser; doing so may require you to make your consent choice again.
Links and feedback
Documentation and X contact links lead to other services with their own privacy policies. Feedback you choose to send through X is handled there; the site has no feedback database. Use synthetic examples instead of customer data when reporting an issue.
For questions, contact @sashimi_mong on X.