You need a standard performance export from Meta Ads Manager, Google Ads, or TikTok Ads — the campaign or ad-level report with spend, clicks, conversions and revenue columns is enough; no special formatting is required. The tool parses column headers automatically.
Your data stays private: the CSV is parsed entirely client-side, in your browser. It is never uploaded to a server, so you can run the audit on live ad account data without it leaving your machine.