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CSV Format Checker

Validate a CSV file’s structure (delimiter, quotes, and column consistency) and get a quick report you can copy. Everything runs client-side.

Category: Data · URL: /tools/csv-format-checker.html
Privacy: runs locally in your browser. No uploads, no tracking scripts.

How to use

Paste your CSV, choose delimiter options, then run the check.

  1. Paste CSV text into the input box.
  2. Select Delimiter (or keep Auto-detect).
  3. Optional: enable Header row and Ignore empty lines.
  4. Click Check CSV to get a validation report and mismatched rows (if any).
Keywords this page targets (natural cluster): csv format checker, csv validator online, check csv formatting, csv file validation, csv delimiter checker, csv column count check, csv quote checker, detect unclosed quotes in csv, rfc 4180 csv check, validate csv header, csv parse errors checker, find malformed csv rows, csv semicolon delimiter validator, tab delimited file checker, pipe delimited csv checker, csv consistency checker, csv row length mismatch, online csv lint tool, csv structural validation, csv preview parser
Secondary intents covered: Confirm a CSV can be imported into Excel/Sheets without breaking columns, Detect rows with too many or too few fields, Verify quotes are closed and escaped quotes are valid, Identify the correct delimiter (comma/semicolon/tab/pipe), Validate whether a header row matches the column count, Generate a copyable report for debugging or sharing, Quickly preview parsed rows/columns before loading into another tool, Troubleshoot CSV exports from databases or apps, Check TSV/semicolon-separated files that are labeled as CSV

FAQ

What does this CSV format checker validate?

It checks delimiter parsing, quoted fields, unclosed quotes, and whether each row has the same number of columns.

Does it support commas inside quoted fields?

Yes. Delimiters inside quotes are treated as data, and escaped quotes ("") are supported.

Can it detect the delimiter automatically?

Yes. Auto-detect compares common delimiters (comma, semicolon, tab, pipe) on the first few non-empty lines.

What does “Header row” change?

If enabled, the first parsed row is treated as a header for reporting; column consistency is still checked against the first row’s column count.

Why do I see “inconsistent column count”?

At least one row has more or fewer fields than the expected column count, usually due to missing delimiters or broken quoting.

Is my CSV uploaded anywhere?

No. The tool runs in your browser and does not send data to a server.

Can I validate TSV or semicolon-separated files?

Yes. Choose Tab or Semicolon as the delimiter (or leave Auto-detect on).