SUPPLIER CSV CHECK
Find CSV problems
before they cost you time.
Check file formatting, choose your SKU column and spot duplicates or missing values. Download a report you can use to fix the source file.
Your CSV stays in this browser. There is no upload, account or analytics. This tool does not read or write Shopify metafields and cannot check your store or import data.
1 Choose your CSV
UTF-8 CSV only · Up to 5 MiB, 20,000 data rows and 200 columns. Quoted commas and multiline text are supported.
The synthetic example deliberately includes duplicate/missing SKUs and an empty value. It contains no store data.
Choose a file or try the example. No purchase is needed.
2 Choose what to check
SKU values stay as text, including leading zeros. Spaces are flagged, never silently trimmed.
Changing the SKU column or delimiter resets these choices and the previous report. Row structure and SKU checks are never ignored.
3 Your review
The report lists errors, warnings and explicit column exclusions. It does not contain a corrected CSV or change your file. Line 1 means a file/header or column-selection issue.
Issues to review
For empty-cell issues, “Field” lists one-based column numbers. Find those columns in the preview headers or the column choices above.
Preview the source data
First 25 rows and 6 columns only; long values are shortened to 200 characters on screen. The source file is unchanged.
A clear report only means these checks found no issues. It does not verify prices, stock, product existence, destination-specific formats or Shopify metafield definitions. Case-only SKU differences are warnings because destinations may treat them differently.