SheetSmith is a small, transparent Python toolkit for cleaning and deduplicating CSV data. It includes a runnable command-line script, a sample input file, usage notes, a preview PDF, and a source-first layout that makes each transformation easy to inspect. Use it as an educational utility, a repeatable starting point for spreadsheet repair, or a base for a larger data-quality workflow. The included files are organized for immediate use and careful review: start with the README, open the preview, follow the demo notes, and then adapt the source material to your own workflow. This package is intentionally practical, clearly labeled, and suitable for creators who value an original, reusable foundation.