How these guides are written
CSVFixLab separates syntax problems from business-data problems. The guides explain what can be proven from the file itself, what depends on the destination platform, and what should never be guessed automatically.
Where a guide discusses Shopify-specific behavior, it links to Shopify's official documentation and distinguishes offline file checks from rules that require a live store.
Guides plus reproducible evidence
For the most important failure modes, the Lab Cases provide downloadable fixtures. That lets you move from an explanation to a controlled test instead of relying on screenshots or claims alone.
Prefer a direct check? Start with the CSV Import Checker. For the exact repair decision rules, read the CSVFixLab methodology.