Privacy
Your files stay on your device.
Files you check
The spreadsheet or CSV you drop on the validator is read and checked by code running in your own browser. It is not uploaded, and no part of its contents is sent anywhere. The downloads are built in your browser too.
What is stored on your device
No cookies. If you type certifier details for the PDF, they are saved in this browser's local storage so you do not have to retype them. Clearing site data removes them.
What the site counts
To see whether the tool is useful, each page sends a small anonymous event to this site: the event name (visit, tool used, export, payment interest, feedback), the page path, the time, and a short note such as "validate: 12 rows, 9 valid" or the website that linked here. A lookup that finds nothing sends the code that was typed, so missing codes can be added. No IP address, browser details or identifier is stored, and events are deleted after 120 days.
Feedback
Text you type in the feedback box is stored as written for up to 120 days. Do not put personal or confidential details in it.
Contact messages
A message sent from the contact page is stored as written, with the reply address if you give one, for up to 120 days, and is used only to answer you.
Payments
The paid step is free during launch. When payment is switched on it will be handled by a separate checkout provider under its own privacy terms.
Certrow is an information tool, not tax, legal or professional advice.