SterileCSV Test Kit

CSV Risk Scan (Local)

Scan a CSV for patterns that Excel often rewrites on open.

Safety note: This file contains CSV/formula-injection examples (cells that start with = / @). Treat it as untrusted.

Run a local risk scan

Select a CSV file. The analysis runs in your browser — nothing is uploaded.

Sample kit (download)

Download test CSV

What it demonstrates

Leading zeros removed: IDs like 00123 become 123.
Precision loss: long IDs (16+ digits) are converted to scientific notation and altered.
Locale/date guessing: 03/04/2026 changes meaning across machines.
Formula injection: values starting with = / @ are interpreted as formulas.

How to run the test

Download the CSV.
Open it directly in Excel (double-click).
Observe the damage.
Now compare: run it through SterileCSV and open the generated .xlsx.

SterileCSV output (generated)

We ran this exact CSV through SterileCSV with default safe settings (formula-like values stored as text; ambiguous dates kept as text).

Download output XLSX Download summary JSON

Leading zeros preserved: IDs stay 00123 (not 123).
Long IDs preserved: long identifiers remain exact (not scientific notation).
Formula injection neutralized: cells that begin with =/@ are stored as text (not executed).

Try the proof demo or get SterileCSV.