A small test. A clearer picture.

Know what survived
the round trip.

Imports can succeed while quietly changing your data. Send known controls through your workflow, then check what comes back.

Your files stay on this computer. No account, uploads to a cloud service or external resources.

Before your import

Start with values you can trust.

5 formats · exact comparison

Generate a test file, pass it through an isolated import/export workflow, then bring the export back here.

File formatControl set

Advanced settings

Text encoding (blank = default)CSV delimiterID columnValue column

Additional custom controls (JSON array) Require the original row order when checking

Use isolated test data. Formula-like controls may be evaluated by spreadsheet software. Import them as literal text; never mix probes into production records.

01 / GENERATE

Make the edge cases visible.

Leading zeroes, long numbers, Unicode, spaces, dates and formula-like text.

02 / ROUND TRIP

Use the workflow you rely on.

Import and export the controls in an isolated area of your application.

03 / COMPARE

See the exact differences.