CSV Validator
Validate CSV files online for missing headers, bad delimiters, malformed rows, inconsistent columns, and other common formatting issues before import, analysis, or automation.
Validate CSV structure
Upload a CSV file to detect common formatting and structure issues before import or processing.
Errors
0
Warnings
0
Rows
0
Detected Delimiter
-
Validation summary
Review key file details and download the validation report.
Upload a CSV file or load the sample to see validation results.
Detected issues
Run validation to see detected issues and warnings.
Preview first rows
Upload a CSV file to preview the first few rows.
What this tool checks
- Missing or duplicate headers
- Malformed quoted rows
- Inconsistent column counts
- Possible delimiter mismatch
- Empty rows and data-quality warnings
Useful for
- Developers validating import files
- Analysts reviewing exported reports
- Teams checking vendor CSV data
- QA before upload into apps or databases
- Daily operations and automation workflows
Privacy
Your CSV validation happens in your browser. You can inspect issues and download a report without storing data on a server.
How to use the CSV Validator
- 1. Upload a CSV file or load the sample dataset.
- 2. Review the detected delimiter and file summary.
- 3. Check errors, warnings, and affected row numbers.
- 4. Fix the source CSV if issues are found.
- 5. Download the validation report if needed.