Files stay in your browser
The included tool does not require an account, upload service, analytics connection or external API.
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.
Get CSV Update Guard — $9→Gumroad checkout · no subscription
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
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