Check CSV Data Quality, free in your browser

Review a CSV or TSV for blank and duplicate column names and rows with missing or extra cells. Download the findings as a CSV report.

How to check CSV data quality

1. Choose a CSV or TSV file.
2. Choose whether the first row contains column names.
3. Check the file and download the issue report.

Limits & good to know

• CSV and TSV files up to 50 MB, 500,000 rows, and 2,000 columns are processed on your device.
• The report identifies structural issues; it does not validate business rules or infer field types.
• A clean file receives a report row stating that no structural issues were found.

Frequently asked questions

Are my files uploaded to a server?

Your files are processed on your device, not uploaded to our servers. Your file and edits are saved in this browser for recovery, and previous documents remain in Saved drafts when you open another file. Use Saved drafts to resume or delete individual copies, or clear this site’s browser data to remove all copies. Browser storage can be cleared or become unavailable; download important work.

Does this check whether the values are correct?

It checks headers and row widths only. It does not know your business rules or decide whether a value is valid for your use.

Is this really free, or free "until you hit a limit"?

Really free. Unlike most "free" PDF sites there is no task-per-day cap, no locked Pro features, no watermark stamped on your file, and no payment step before download. Every tool is the full tool.