# Find CSV round-trip changes without guessing repairs

A continuous local browser walkthrough with original synthetic CSV pairs. Choose the exact key, expose lost zeros and date text changes, distinguish empty from missing cells, and keep duplicate keys unresolved. Caption-led; no speech. File comparison is local; this does not certify destination behavior.

00:00:01,407 — Compare an original CSV and its exported copy. You must choose the row key explicitly.

00:00:18,551 — Load the fictional original and exported files. The exact row-key column is id.

00:00:36,257 — 0012 became 12. Raw-string comparison exposes the change without restoring zeros.

00:00:54,912 — Date text changed. The tool does not decide which locale or interpretation was intended.

00:01:13,498 — A missing trailing cell differs from an explicitly empty string. Keep that distinction.

00:01:32,035 — Duplicate keys make this comparison unresolved. The tool does not invent row matches.

00:01:50,431 — Added and removed rows are reported separately under the selected exact key.

00:02:09,198 — Row order and column order can change without changing values. Verify destination behavior separately.