Building a Privacy-First Google Ads Analyzer (No Server, No Data Upload)

We built a Google Ads CSV analyzer that finds wasted spend and suggests optimizations. The twist? Everything runs in the browser. No server uploads. No data leaves your machine. Here's how we built it and why we made those choices. The Problem Small business owners often waste 20-40% of their Google Ads budget on irrelevant search terms and underperforming keywords. Enterprise tools cost $100-500/month to identify these issues. We wanted something free, but privacy was a concern — businesses are reluctant to upload their ad spend data to unknown servers. The Solution: Client-Side Processing Instead of uploading CSVs to a server, we process everything in the browser using the FileReader API. Reading CSV Files ⁠javascript const handleFileUpload = (file: File) => { const reader = new FileReader(); reader.onload = (e) => { const text = e.target?.result as string; const rows = parseCSV(text); analyzeData(rows); }; reader.readAsText(file); }; ⁠ ### Parsing CSV Data Google Ads exports aren't