CSV Linter

Upload a CSV file to check for syntax errors, inconsistent columns, encoding issues, and other data quality problems.

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Check your CSV file for structural issues and data problems

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Supports .csv, .tsv, and .txt files up to 10MB

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Files are processed in memory and deleted immediately. We never store your data.

What Does the CSV Linter Check?

Our CSV linter performs comprehensive checks including column count consistency, encoding validation, delimiter detection, empty row analysis, header quality, duplicate detection, and data type uniformity. Each issue is categorized by severity (error, warning, or info) so you can prioritize fixes.

Why Lint Your CSV Files?

Linting catches problems before they cause issues during data imports, ETL pipelines, or analysis workflows. Common CSV problems include mismatched column counts, mixed encodings, trailing commas, and inconsistent quoting. Our linter identifies these problems instantly and helps you fix them.

Frequently Asked Questions

What is the difference between an error, warning, and info?

Errors indicate issues that will likely break imports or data pipelines — fix these first. Warnings highlight problems that may cause unexpected behaviour depending on your use case. Info items are observations (e.g. encoding type) that require no action but are useful to know.

My CSV looks fine in Excel — why does the linter flag issues?

Excel is very forgiving and silently corrects many structural problems on open. Systems like databases, APIs, and ETL tools are stricter. The linter checks against strict RFC 4180 CSV standards so your file works everywhere, not just in Excel.

Does the linter fix the issues it finds?

The linter identifies and reports issues — use the CSV Validator's auto-fix feature to automatically correct common problems like encoding, extra whitespace, trailing delimiters, and inconsistent line endings.

CSV Tools