CSV inspector & schema diff

Drop a CSV to see its columns, inferred types, blanks, and row count. Drop a second to diff the headers and catch a dropped or renamed column before it silently shifts your data. Everything runs in your browser.

Companion to The Missing Column That Didn't Crash · all tools

These tools run entirely in your browser and are provided as-is, for learning and convenience, with no warranty of accuracy — verify anything important against your own setup before relying on it.