Offline browser tool · one-time purchase
See risky CSV changes before they go live.
Compare a current export with a proposed update. Review exactly what was added, removed or changed before you import it into another system.
What it checks
Review the update, not just the file.
Choose the column that identifies each record. The tool compares the two files and keeps the original files unchanged.
- 01Added, removed, changed and unchanged rows
- 02Duplicate or missing values in your chosen key column
- 03Columns that appeared, disappeared or changed position
- 04Non-empty values that a proposed update would replace with blanks
- 05Formula-like cell values that deserve a manual review
- 06Row-by-row before and after evidence for selected changes
Files stay in your browser
The included tool does not require an account, upload service, analytics connection or external API.
Export only reviewed changes
Select the rows and columns you approve, then create a patch CSV and a downloadable HTML risk report.
Independent and platform-neutral
Use it with ordinary CSV exports. Import behavior varies by platform, so keep a backup and use the destination's own preview too.
A small check before a large import.
One-time purchase · ZIP delivery through Gumroad