# An identifier lost its leading zeros

Recorded September 19, 2026. Silent continuous local browser interaction with visible captions; only idle ending time removed. Inputs are original fictional fixtures, not vendor exports.

[Watch the MP4](https://workflow.editorialdeskmedia.com/downloads/workflow-csv-walkthrough-2026-09-19.mp4)

1. Open the [local CSV comparison tool](https://workflow.editorialdeskmedia.com/guides/csv-round-trip-comparator).
2. Select [the original fixture](https://workflow.editorialdeskmedia.com/downloads/csv-roundtrip-zeros-before.csv) and [the returned fixture](https://workflow.editorialdeskmedia.com/downloads/csv-roundtrip-zeros-after.csv).
3. Enter `id` as the exact row-key column, then select Compare files.
4. The result contains one changed value: `account` for `row1` changed from `0012` to `12`. Matching row counts would not catch this change.
5. Download the JSON difference report. The checker preserves strings and reports differences; it does not infer the intended value or repair your destination.

Both files are processed locally in the browser. This demonstration checks these fixtures and the comparison interface. It does not certify an import process, a vendor's behavior, or a complete migration.

Publication: Automation Tools Compared, Editorial Desk Media. The site contains separately disclosed affiliate links; this walkthrough does not test or recommend a vendor. Captions were prepared with AI assistance and checked against the recorded actions.