Drop the final CSV, TSV, or TXT Amazon template export, or paste copied spreadsheet rows with the header row
Drop an Amazon template export here
Use a CSV, TSV, or TXT export. You can still paste copied spreadsheet rows below.
Ready.
Data handling: Selected files and pasted rows are processed in this browser.
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Preflight report
Run the checker before uploading to Seller Central
Rows checked--
Issues found--
Blockers--
Next actionCheck file
After a check, repair the flagged rows in the source file. The report keeps the row number, field, reason, and suggested action together so you can correct the export before rerunning it.
Run the checker to generate an Amazon flat file preflight report.
No row-level issues yet.
| Row | Severity | Type | SKU | Field | Value | Reason | Suggested action |
|---|
Recommended laneUp to 500MB on modern desktop browsers
Local preflightNo upload; CSV/TSV files stream in a worker
Large reportsIssue reports are split into downloadable CSV parts
What to check before an Amazon flat-file upload
This checker looks for missing SKU, price, and update-action columns; blank or duplicate SKUs; invalid prices, quantities, actions, and image URLs; and parent-child variation risks.
Prepare the file, run the check, repair the source rows, then run it again before uploading in Seller Central. This tool does not connect to your seller account, upload the file, or replace Amazon's final category and account validation.
For large files, use Chrome or Edge on desktop and keep this tab open while the worker runs. If the file is above 500MB or the browser warns about memory, use Split CSV first.
Tool guide
What to know before using the result
The main task stays first. Open these notes only when you need the source rules, method, or boundaries behind the result.
Review a row-level issue table, copy the summary, or download a CSV report for missing columns, SKU, price, quantity, action, image, and variation issues
Runs in this browser
Limits and checks before using the result2 notes
Source requirements and report boundaries
- Does not connect to Seller Central or submit files.
- Does not cover every category-specific rule that only Amazon can validate after upload.
How to use this tool3 steps
Amazon flat-file checks and report limits
- Drop a CSV or tab-delimited Amazon template export, or paste the flat file content copied from your spreadsheet.
- Run the preflight check to scan SKUs, prices, quantity values, update actions, image URLs, and variation fields. Large CSV files stream through a local worker instead of being uploaded.
- Download the issue report and fix high-risk rows before uploading the file in Seller Central.
FAQ
Which files can I paste?
Paste CSV or tab-delimited Amazon inventory template data copied from a spreadsheet, including the header row.
Can it handle large Amazon flat files?
Large CSV, TSV, and TXT files run locally through a Web Worker with chunked reads and a two-pass rule engine. No account or upload is required.
What should I fix first?
Start with missing SKU columns, blank SKUs, duplicate SKUs, invalid prices, invalid quantities, and variation parent-child errors.