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CSV Validator

Check that every CSV row has the same column count and that the header row is clean.

Your CSV

Delimiter: — · Columns: — · Rows: —

Header names

—

Problems

—
Quoted fields, doubled quotes and quoted line breaks are all handled.

How to use the CSV Validator

  1. Paste the CSV data you want to check.
  2. Leave the delimiter on automatic, or pick the one your file uses.
  3. Read the header list and the numbered rows that break the column count.

Features

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Frequently Asked Questions

Common questions about the free online csv validator.

It reads the header row, then verifies that every following row has the same number of fields and reports the rows that do not.
Each common delimiter is tried on the first lines and the one that produces the most consistent field count wins, with comma as the fallback.
Rows with too few or too many fields, empty header names and duplicate header names, each with the exact row number.
Yes. Text inside double quotes is treated as a single field, so commas, quotes and line breaks inside it are preserved.
Yes. When a quoted field is left open, the parser keeps reading until the closing quote, exactly as the CSV format requires.
This tool assumes the first row names the columns. If your file has no header, ignore the header warnings.
No. All parsing happens in your browser, so your data never leaves your device.
Yes, the CSV validator is completely free and unlimited, with no account needed.

Last updated: October 10, 2026