Spreadsheet Guard — a Dal Bello Labs demo

1. Choose a file

Drop a .csv or .xlsx file here, or choose a file One file per run. For .xlsx, the first sheet is checked.

2. Set the rules

Columns are pre-filled from the file. Change anything and the checks re-run straight away.

Date column Numeric dates like 03/04/2026 are Amount column Tie-out column Expected control total

Required columns (must exist and have no blanks)

Rules to run

Required columns present No blanks in required columns Dates parse consistently Amounts are numeric No exact duplicate rows Find subtotal and total rows Control-total tie-out Remove duplicate rows from the cleaned copy

3. Report

This tool checks the rules you set. It does not audit your books, and values it cannot read safely are flagged and left exactly as they were, never guessed.

1. Choose a file

2. Set the rules

3. Report

Notes