I needed a fast, simple way to analyze a million-row CSV in my browser. So I built a CSV Query Builder that autodetects column types, filters & slices data, and needs no setup. Your data stays safe, it’s fully responsive, and no cryptic errors—just insights.

I recently hit a wall trying to query over a million rows in a CSV file. Every online tool I tried was either too slow, too complicated, or asked me to pay up. After one too many frustrations, I decided to build my own CSV query builder using Next.js and React 19. It runs entirely in your browser—no fancy setup, no servers—so your data stays safe. Just drag in your file, and it automatically detects column types: text, numbers, dates, booleans, the works. You can filter and slice through millions of rows smoothly, without feeling like you’re fighting the software. The interface is clean, responsive, and works great whether you’re on a large monitor or just glancing at your phone. If something goes wrong, it doesn’t hide behind cryptic errors; it helps you fix the issue. This is the CSV query tool I needed but couldn’t find, and now I’m sharing it with you. Enjoy!

Thanks for solving my problem, but it seems that just filtering and viewing is too simple. I hope there will be more options, such as batch export of filtered data, and export of charts for year-on-year and month-on-month comparison. I hope the degree of freedom can be higher. Thanks

CSV Query Playground

Query from a large CSV dataset clietn side

Query from a large CSV dataset clietn side